tag:blogger.com,1999:blog-54807506946938253362024-03-21T00:59:58.177-07:00G0KYA's Amateur Radio BlogThanks for stopping by. This is where I publish a lot of my features and thoughts on HF propagation, antennas and other ham radio topics. I write for a number of radio magazines, including the RSGB's RadCom and ARRL's QST. I am also chairman of the RSGB's Propagation Studies Committee and produce the weekly HF propagation report for GB2RS. When not playing radio I'm a professional journalist specialising in aerospace, science and technology and am also author of four RSGB books.Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.comBlogger214125tag:blogger.com,1999:blog-5480750694693825336.post-4923517005660947572024-02-21T05:20:00.000-08:002024-02-21T05:20:07.325-08:00New worldwide 10m beacon list issued<p>RSGB’s Propagation Studies Committee (PSC) has released a new HF beacon list, with the 10m listings completely revamped.</p><p>The old list, which was started by Martin Harrison G3USF (SK), had been added to over the years, but was getting out of date. The only way to make it more accurate was to start again.</p><p>Use was made of the Reverse Beacon Network (RBN), which wasn’t available when the list was originally created, plus listeners’ contributions from around the world. </p><p>I started by removing around 60 beacons that had not been heard for some time. Delving deeper it seems that a lot had been taken off the air, the owners had died, or their frequencies had changed.</p><p>Using the RBN gave a pretty good indication of what beacons are actually on air, plus help from a list compiled by Gary ZL2IFB filled in some of the gaps.</p><p>Beacons that are temporarily off-air have been left in, but marked in black.</p><p>While no list will ever be complete as changes take place around the world, I think the list is now far more useable. I’ll endeavour to make changes as and when they are needed.</p><p>The new beacon list can be found at:</p><p><a href="https://rsgb.org/main/technical/propagation/propagation-beacons/">https://rsgb.org/main/technical/propagation/propagation-beacons/</a></p>Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com0tag:blogger.com,1999:blog-5480750694693825336.post-61948548878212220802024-01-07T08:12:00.000-08:002024-01-21T03:55:41.146-08:00Help needed with Index Laboratories' QRP+ radio<div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiT62qPsEiB1Gcc-NYYpHKioJkB27S3g5MhCx_4kCa_j_-Rzp7lJuF6Rd1KaxLjVEdml3MLjdK4TlCUV4_yrYQWt7O27N3DjsHp-Rszn74XpQmBlwu7NBo6zfEwX09z3MU2VXAGBJjYX36TpwAvhfG1s4G7mGckob6DTn_puR9Pu-8C6E1vthYloKmIK7Q/s4032/IMG_5137.JPG" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="3024" data-original-width="4032" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiT62qPsEiB1Gcc-NYYpHKioJkB27S3g5MhCx_4kCa_j_-Rzp7lJuF6Rd1KaxLjVEdml3MLjdK4TlCUV4_yrYQWt7O27N3DjsHp-Rszn74XpQmBlwu7NBo6zfEwX09z3MU2VXAGBJjYX36TpwAvhfG1s4G7mGckob6DTn_puR9Pu-8C6E1vthYloKmIK7Q/s320/IMG_5137.JPG" width="320" /></a></div>I need your help! </div><div><br /></div><div>But first some background. The Index Laboratories' QRP+ is a 1990's 5W all-band QRP transceiver from the USA. I bought mine at a club sale and it was supposed to be working fine.</div><div><br /></div><div>But it wasn't! Never mind, we all love a</div><div>challenge, don't we?</div><div><br /></div><div>It seems that the SBL-1 mixer is a common failure point so a replacement was ordered.</div><div><br /></div><div>The rig comprises four boards, which are stacked and have interconnecting leads.</div><div><br /></div><div>It is relatively easy to pull apart, and the mixer is on the top board.</div><div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjXcqpRw9qzStTabqPplW-PKiJSin7t4AU5IYeEcowERB2ycw-tfnDHPtS1rT5P4-t9EkIdOCvAMj7haljATSz-odkwq8x5pavUv6K7MHciLWELMS-5Cng1slAO6lM-K9-AmRzQPi0XH5yrgvlqCtmbxVrxm8nlJ0SrdVP4wFQjjy7lS_PViwrTgVRAiTc/s4032/IMG_5074.JPG" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="4032" data-original-width="3024" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjXcqpRw9qzStTabqPplW-PKiJSin7t4AU5IYeEcowERB2ycw-tfnDHPtS1rT5P4-t9EkIdOCvAMj7haljATSz-odkwq8x5pavUv6K7MHciLWELMS-5Cng1slAO6lM-K9-AmRzQPi0XH5yrgvlqCtmbxVrxm8nlJ0SrdVP4wFQjjy7lS_PViwrTgVRAiTc/s320/IMG_5074.JPG" width="240" /></a></div><br />After a big desoldering struggle I fitted the new SBL-1 (U5), which brought the receiver back to life. Unfortunately, the TX still didn't work. Back to the drawing board.</div><div><br /></div><div>The next stage was to replace the final PA transistor, which is on the lowest board. This is a IRF510 (Q9) and I ordered a few off Ebay. I fitted a new one and in tests I found that I could only get about 0.1W out! (on CW) with the gate bias backed off fully anticlockwise. </div><div><br /></div><div>Power out should be about 5W.</div><div><br /></div><div>Anyway, that's as far as I have got. I have attached a link to the <a href="https://w1hue.org/QRP_PLUS_V2_Schematics.pdf" target="_blank">circuit diagram</a> and would appreciate any suggestions.</div><div><br /></div><div><b>Update</b></div><div><br /></div><div>Well, some replacement IRF510s were sourced from the G-QRP club (thanks guys). Apparently, there are some "fake" IRF510s around that don't play well with RF. After pulling the radio apart (again) and replacing the transistor, it was a little better - about half a Watt output. Anyway, to cut a long story short I have passed the radio to another G-QRP club member and I hope he has more luck than I did! </div><div><br /></div>Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com0tag:blogger.com,1999:blog-5480750694693825336.post-6927668736919764732024-01-06T05:09:00.000-08:002024-01-06T05:09:39.591-08:00Update to UK propagation charts<p></p><div class="separator" style="clear: both; text-align: right;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4eZlzS1D4lZdJA9P9cDZrwIzZOfaI0F-vQANe7Mz4Ax0j0UGpmM2_mbHC7GCWjxrfmT0u0TNXc40OcGjGftG_iivJ4URqDY9k-x3plpV1SfxaJlvq3mHZAF2nUa80HIMff8D3hvvPQrU/s320/16UT-28MHz.gif" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="160" data-original-width="320" height="160" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4eZlzS1D4lZdJA9P9cDZrwIzZOfaI0F-vQANe7Mz4Ax0j0UGpmM2_mbHC7GCWjxrfmT0u0TNXc40OcGjGftG_iivJ4URqDY9k-x3plpV1SfxaJlvq3mHZAF2nUa80HIMff8D3hvvPQrU/s320/16UT-28MHz.gif" width="320" /></a></div><br />I'll freely admit that my UK propagation charts had been a bit neglected over the past year. But not any more!<p></p><p>I've now updated them until the end of 2024 with new predicted smoothed sunspot numbers.</p><p>I've also fixed a problem with the Kp graphs. They now appear, along with solar X-ray and proton flux graphs. This was because the US Space Weather Prediction Center had stopped the production of the previous Kp chart.</p><p>I still recommend both Proppy and VOACAP.com if you want detailed HF forecasts, or if you want to do long-path predictions. But for casual use my charts are fine, and produced using VOACAP.</p><p>Leave a comment if you find them useful (or not!).</p><p>Incidentally, the SSN charts I used show that the expected solar maximum is the middle of this year.</p>Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com0tag:blogger.com,1999:blog-5480750694693825336.post-62148654445758765362023-04-15T03:24:00.000-07:002023-04-15T03:24:07.124-07:00Preparing the GB2RS propagation report<p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjy81Xf0XOkrMMF0pv9_ir8nug5rgZYHxSOP4C1n9NQqVQuZy-vbw-EX8gESD-kzah-BAjNTrmnFY39_2e8B44EXHeWu2kdXC7dHd0Pss7q1x-cb0A95G6zx26fp3lp40AVNHv4LZgcknRQIX1jgxaMfRvU0G0HHY0OZBFkVv6xo0PVbHmXE3q_z8uk/s200/prominence.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="200" data-original-width="200" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjy81Xf0XOkrMMF0pv9_ir8nug5rgZYHxSOP4C1n9NQqVQuZy-vbw-EX8gESD-kzah-BAjNTrmnFY39_2e8B44EXHeWu2kdXC7dHd0Pss7q1x-cb0A95G6zx26fp3lp40AVNHv4LZgcknRQIX1jgxaMfRvU0G0HHY0OZBFkVv6xo0PVbHmXE3q_z8uk/s1600/prominence.jpg" width="200" /></a></div><br />Attached below is a PDF (14Mb) of the presentation I gave on 15th April 2023 after the RSGB AGM.<p></p><p>It looks at how we prepare the weekly propagation report for the RSGB's GB2RS news report. It contains a lot of useful URLs to sources, data and programs that people might find useful.</p><p>Steve G0KYA</p><p><a href="http://www.infotechcomms.co.uk/GB2RS Propagation.pdf" target="_blank">Download GB2RS_Propagation.pdf</a></p>Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com0tag:blogger.com,1999:blog-5480750694693825336.post-61208546539153723992023-03-30T08:31:00.008-07:002023-03-30T08:45:09.614-07:00Ten metres (28MHz) beacon list updated<p>I've just spent two days updating the RSGB's 28MHz beacon list. I used the reverse beacon network and logged/updated the beacon list accordingly. This takes a lot of time as many of the "spots" are misread and have to be checked individually.</p><p>Beacons heard over the last three years are highlighted in red. I'm now happy that it is pretty up-to-date. The RBN has a beacon listing, but it is way out of date - GB3RAL is still listed and that hasn't been on for years.</p><p>I think this is the best way as it reflects beacons that are actually transmitting and not just listed. The full beacon list can be found on the propagation section of the RSGB website here: <a href="http://rsgb.org/main/files/2023/03/G3USFs-Worldwide-List-of-HF-Beacons.pdf">http://rsgb.org/main/files/2023/03/G3USFs-Worldwide-List-of-HF-Beacons.pdf</a></p><p>The actual changes are:</p><p><span style="font-family: courier;"><b>Change of freq/details:</b></span></p><p><span style="font-family: courier;">28270.5 PY4MAB Pocos de CaldasGG68 2W </span></p><p><span style="font-family: courier;">28193.1 LU2DT Mar del Plata GF12 5W </span></p><p><span style="font-family: courier;">28208 WD5GLO Minco OK EM15ah 3W </span></p><p><span style="font-family: courier;">28281 AG8Y Middletown OH EM79TL 7.5W </span></p><p><span style="font-family: courier;">28273.8 WI4L Dalton GA EM74MS </span></p><p><span style="font-family: courier;">28243 AA1SU VT FN34KL 5W </span></p><p><span style="font-family: courier;">28209.5 N2UHC St Paul KS EM27JM 4W</span></p><p><span style="font-family: courier;">28203.3 WB9OTX EN55 5W </span></p><p><span style="font-family: courier;">28280.4 KE4IFI Lexington SC EM9JV 7W </span></p><p><span style="font-family: courier;"><b>Additions:</b></span></p><p><span style="font-family: courier;">28297.9 K4JDR Raleigh, NC FM05<span> </span> 10W </span></p><p><span style="font-family: courier;">28255.8 WB4NCT Athens, AL EM64 5W </span></p><p><span style="font-family: courier;">28241.3 WW2BSA Warren, NJ FN20OU 7W </span></p><p><span style="font-family: courier;">28260.8 IQ8BB Salerno JN70JQ </span></p><p><span style="font-family: courier;">28178 IQ0GV Sora JN61TR 5W </span></p><p><span style="font-family: courier;">28236.3 F1ZTS Rochefort in97QI 10W </span></p><p><span style="font-family: courier;">28266.1 VK4RST St George QLD QG41HW 10W</span></p><p><span style="font-family: courier;">28285.9 AJ4YN Chesapeake, VA FM16UO ? ? </span></p><p><span style="font-family: courier;">28215 GB3MCB Cornwall, UK IO70OJ ? </span></p><p><span style="font-family: courier;">28252.6 WD8INF Lebanon OH EM79VK 10W</span></p><p><span style="font-family: courier;">28258.8 AC5JM Bartlesville OKEM16FT ?</span></p><p><span style="font-family: courier;">28209 N5TIT Westminster, COEM12PX 10W </span></p><p><span style="font-family: courier;">28206.5 N4SO Grand Bay, AL EM50tk 6W </span></p><p><span style="font-family: courier;">28296.2 VE3IIM Hanover, ON EN94LD 4W </span></p><p><span style="font-family: courier;">28321.4 IZ1KXQ La Spezia JN44WC 0.1W</span></p><p><span style="font-family: courier;">28230.8 NG7I Ritzville WA DN07TC 5W </span></p><p><span style="font-family: courier;">28202 WB7EUX Joseph, OR DN15JI 10W </span></p><p><span style="font-family: courier;">28233.5 K7RA Seattle, WA CN87UQ 11W </span></p><p><span style="font-family: courier;">28260 KC4QLP Little Falls NYFN23OB 10W </span></p><p><span style="font-family: courier;">28245.3 K0WKT Black Dia. WA EN36WT 5W </span></p><p><span style="font-family: courier;">28226 K6KWS Redwood City CA CM87VL 10W </span></p><p><span style="font-family: courier;">28240.1 W8EDU Cleveland, OH EN91EM 10W</span></p><p><span style="font-family: courier;">28206.9 N4XRO Burbank CA DM04UE 5W </span></p><p><span style="font-family: courier;">28276 XE1JAL Xalapa EK19MM 5W</span></p><p><span style="font-family: courier;">28230.3 W2MQO Grand Island FLEL98dv 10W</span></p><p>73 de Steve G0KYA<br />Chairman, RSGB Propagation Studies Committee</p>Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com3tag:blogger.com,1999:blog-5480750694693825336.post-39203255775769035292022-10-21T04:50:00.003-07:002022-10-21T04:50:48.432-07:00Autumn 2022 HF popagation charts updated<p> </p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4eZlzS1D4lZdJA9P9cDZrwIzZOfaI0F-vQANe7Mz4Ax0j0UGpmM2_mbHC7GCWjxrfmT0u0TNXc40OcGjGftG_iivJ4URqDY9k-x3plpV1SfxaJlvq3mHZAF2nUa80HIMff8D3hvvPQrU/s360/16UT-28MHz.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="180" data-original-width="360" height="160" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4eZlzS1D4lZdJA9P9cDZrwIzZOfaI0F-vQANe7Mz4Ax0j0UGpmM2_mbHC7GCWjxrfmT0u0TNXc40OcGjGftG_iivJ4URqDY9k-x3plpV1SfxaJlvq3mHZAF2nUa80HIMff8D3hvvPQrU/s320/16UT-28MHz.gif" width="320" /></a></div><br />I have just updated my propagation charts for October, November and December 2022 with new sunspot numbers. <div><br /></div><div>I will update the Spring 2023 charts when we get a little closer as they are likely to change as we head towards the maximum of solar cycle 25. </div><div><br /></div><div>Anyway, it is nice to see some good predictions of DX on 10 metres and if the past two weeks are anything to go by they are pretty spot on with very loud signals from the USA. </div><div><br /></div><div>ARRL's W1AW's CW practice files were romping in the other day on 28.0675MHz Nice to see 10 metres doing what it does best! </div><div><br /></div><div><a href="http://www.infotechcomms.co.uk/propcharts/">Click here for the charts</a> or use the link on the right-hand side.</div>Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com0tag:blogger.com,1999:blog-5480750694693825336.post-90227385386133060422022-03-18T13:33:00.005-07:002022-03-21T08:40:33.150-07:00Repairing a MFJ-1786 magnetic loop
<div class="separator" style="clear: both; text-align: right;"><br /></div><br /><div class="separator" style="clear: both; text-align: right;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4Xn1u1zK1y_QUMUFO613-tdEA-gJDB9FmyLaHRB4Q5rZdqgfz5D22v3jsp3v7jehSVClMo-bKHTEhg0POxiyVv80KbBxXp0giIIxDLSjk-urVAMzTUY8HnJZUml71WUWIhJmMCmEIu5OVhGD2Xxz38QzPj35tGP8P-0V0_KpGUg-yVVOQ46yaj85Z/s1914/MFJ-1786-Schematic.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="1142" data-original-width="1914" height="191" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4Xn1u1zK1y_QUMUFO613-tdEA-gJDB9FmyLaHRB4Q5rZdqgfz5D22v3jsp3v7jehSVClMo-bKHTEhg0POxiyVv80KbBxXp0giIIxDLSjk-urVAMzTUY8HnJZUml71WUWIhJmMCmEIu5OVhGD2Xxz38QzPj35tGP8P-0V0_KpGUg-yVVOQ46yaj85Z/s320/MFJ-1786-Schematic.jpg" width="320" /></a></div><br />I just wired up my MFJ-1786 magnetic loop, which hasn't been used for years.
Unfortunately, it looked like the loop controller had gone U/S. <div><br /></div><div>The meter lit up, but pressing the loop buttons had virtually no effect. The amber lights flicked slightly, but they were not so bright as I remember them, and the motor didn't turn.
I got hold of a schematic, but it is way more complex than I thought it would be. I first changed the only electrolytic capacitor in the unit as it was getting quite old, but it made no difference. </div><div><br /></div><div>I then stripped the antenna and made sure it was all OK. Connecting a 9V battery made the motor turn, so I sprayed the motor with grease and put it all back together.
Turning to the controller again I first changed Q1, but that made no difference. Then I changed Q5, but nope! So I moved on to the U5 78L12 voltage regulator, which is fiddly job as it is an 8pin SMD. </div><div><br /></div><div>And low and behold it works!
I just need to fix the power meter, which displays reflected power, but not forward, but that can wait until another day. Then finally I can mount it outside for final testing.
I've attached the MFJ-1786 schematic as this was quite hard to track down - might come in handy for someone in the future. Click on the image above to see a larger version.</div><div><br /></div><div><b>Update</b></div><div><br /></div><div><div class="separator" style="clear: both; text-align: right;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgta991VEKNb8UFtgD2kJc3NMjY41hVhSoj2VKPp4UJYmqV2VknTHGEYKB2ud-OAHMoRZpRX5eHUHTPQJlC53sIJ28pJZYprlN0yCzpKyXl8CG6360NWpS6-Kcky6ecD0YKlTy-o4c5RxZuSTLYhlZxxyl0e8litVP3wu8ptmn3dl8q7K4kfagPyIes/s400/IMG_4109.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="300" data-original-width="400" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgta991VEKNb8UFtgD2kJc3NMjY41hVhSoj2VKPp4UJYmqV2VknTHGEYKB2ud-OAHMoRZpRX5eHUHTPQJlC53sIJ28pJZYprlN0yCzpKyXl8CG6360NWpS6-Kcky6ecD0YKlTy-o4c5RxZuSTLYhlZxxyl0e8litVP3wu8ptmn3dl8q7K4kfagPyIes/s320/IMG_4109.jpg" width="320" /></a></div><br />Well, it wasn't a diode that was stopping the meter from working, just a poor connection. </div><div><br /></div><div>So I now have some spare diodes for the future! I've uploaded a higher resolution version of the schematic too.</div><div><br /></div><div>Steve G0KYA</div>Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com5tag:blogger.com,1999:blog-5480750694693825336.post-11221952584697163212021-02-18T07:39:00.008-08:002021-02-19T07:30:19.404-08:00HF propagation charts updated for 2021<p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4eZlzS1D4lZdJA9P9cDZrwIzZOfaI0F-vQANe7Mz4Ax0j0UGpmM2_mbHC7GCWjxrfmT0u0TNXc40OcGjGftG_iivJ4URqDY9k-x3plpV1SfxaJlvq3mHZAF2nUa80HIMff8D3hvvPQrU/s360/16UT-28MHz.gif" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="180" data-original-width="360" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4eZlzS1D4lZdJA9P9cDZrwIzZOfaI0F-vQANe7Mz4Ax0j0UGpmM2_mbHC7GCWjxrfmT0u0TNXc40OcGjGftG_iivJ4URqDY9k-x3plpV1SfxaJlvq3mHZAF2nUa80HIMff8D3hvvPQrU/s320/16UT-28MHz.gif" width="320" /></a></div><br />I've now updated my <a href="http://www.infotechcomms.co.uk/propcharts/" target="_blank">propagation prediction charts</a> for 2021 with the predicted smoothed sunspot numbers from NOAA/NASA.<p>So that's a chart for every hour, for every band and for every month, or more than 2,300 charts in total! The process is fairly automated, but it still fairly tedious and takes about a day to do.</p><p>The charts are useful as a quick guide to what parts of the world may be workable and which aren't. If you want more accurate charts then the ITURHFPROP-based predtest.uk or the VOACAP-based voacap.com websites are better.</p><p>I may need to update them as the year progresses as we get a better idea of how Solar Cycle 25 pans out. At the moment it isn't looking too good. December 2020 saw a sprinkling of SS25 sunspots with a corresponding rise in HF activity. But since January is has been pretty dire really with long periods of no spots </p><p>Anyway, to avoid confusion, I have updated form February onwards. This means that January is actually for 2022. </p><p>The charts are produced using Hamcap which is a VOACAP-based application and they are for short-path only.</p>Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com0tag:blogger.com,1999:blog-5480750694693825336.post-79117852332401046312020-06-24T03:59:00.002-07:002020-06-24T04:00:27.050-07:00VHF propagation video released on YouTube<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhijYH8BYeW7gutb-xLu33KLcg2TeTVhykCiTuY5QMlR_4fvAPfcTOnszVmoTHzyLjwD9EWpxqtKwZ-YyGNzik9dr1paFRQH_JZeFjhwyRKCx-yiZw4D0G7khOW0zBJwFzQ5cENQf7YK1c/s1600/VHF+screenshot2.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="753" data-original-width="1005" height="148" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhijYH8BYeW7gutb-xLu33KLcg2TeTVhykCiTuY5QMlR_4fvAPfcTOnszVmoTHzyLjwD9EWpxqtKwZ-YyGNzik9dr1paFRQH_JZeFjhwyRKCx-yiZw4D0G7khOW0zBJwFzQ5cENQf7YK1c/s200/VHF+screenshot2.jpg" width="200" /></a></div>
As a result of the success of our HF Propagation video on YouTube, which has had 2,000 views in two months, the Propagation Studies Committee has now launched a 20-minute VHF propagation video as well.<br />
<br />
The video was originally produced for club presentations, but with Covid-19 and the lockdown, it wasn't getting much use.<br />
<br />
So if you have never heard what an auroral contact sounds like, for example, now's your chance!<br />
<br />
See <a href="https://www.youtube.com/watch?v=5Yo4IFn6AAY&t=8s">https://www.youtube.com/watch?v=5Yo4IFn6AAY&t=8s</a><br />
<br />
Steve G0KYA<br />
Chairman, RSGB Propagation Studies Committee</div>
Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com0tag:blogger.com,1999:blog-5480750694693825336.post-39579966113267719022020-03-30T08:25:00.002-07:002020-06-24T03:52:33.871-07:00Understanding HF Propagation video released<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1OcAVP6Bb3XreFKdoXhF2zuccDs2EF_CSEk1ugWkCn2q1IatmgwiC7SLfrcmZemjvgl7zwfJRLjPjFjZpnEfjzmNTgZHg70xZLIJm33Lb6Pw8zvEg-13iKuRrf6hutz5aasJioNoo7ko/s1600/g0kya_podcast.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="350" data-original-width="350" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1OcAVP6Bb3XreFKdoXhF2zuccDs2EF_CSEk1ugWkCn2q1IatmgwiC7SLfrcmZemjvgl7zwfJRLjPjFjZpnEfjzmNTgZHg70xZLIJm33Lb6Pw8zvEg-13iKuRrf6hutz5aasJioNoo7ko/s200/g0kya_podcast.jpg" width="200" /></a></div>
I've just published a 40-minute video entitled "Understanding HF Propagation" on YouTube.<br />
<br />
This presentation was originally produced for use with clubs around the UK and has been used by more than 100.<br />
<br />
With the current Covid-19 restrictions in the UK, it looks like club meetings aren't going to be taking place any time soon, so I've released it on YouTube.<br />
<br />
I may do some further videos over the next few months - it depends on how long the restrictions last!<br />
<br />
See <a href="https://www.youtube.com/watch?v=TBO0IYXF79g">https://www.youtube.com/watch?v=DIAgzpdB67A&t=42s</a><br />
<br />
Steve G0KYA</div>
Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com0tag:blogger.com,1999:blog-5480750694693825336.post-52172186627775789572019-10-21T07:03:00.002-07:002019-10-21T07:04:48.053-07:00Range of HF propagation tools launched<div dir="ltr" style="text-align: left;" trbidi="on">
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<a 1em="" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifh5E7LNWVVbMyY8_bgvu9uMkUTJx3yV2j8u-Mn_WyW-0G2qnfe-9U_7qvIcMFKwyTl6Pt2TZgUxSo5FKQHRLMmnGUdDx1Ezz0e4fskHpKg53TOsCflCXxpvj6jVLn7TAkR_4WT_haNqQ/s1600/ITURHFPROP.png" imageanchor="1" margin-bottom:="" margin-left:="" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="554" data-original-width="997" height="177" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifh5E7LNWVVbMyY8_bgvu9uMkUTJx3yV2j8u-Mn_WyW-0G2qnfe-9U_7qvIcMFKwyTl6Pt2TZgUxSo5FKQHRLMmnGUdDx1Ezz0e4fskHpKg53TOsCflCXxpvj6jVLn7TAkR_4WT_haNqQ/s320/ITURHFPROP.png" valign="right" width="320" /></a></div>
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There is now a range of online propagation tools available from the RSGB's Propagation Studies Committee, including Proppy for RadCom, VOACAP for RadCom, Predtest and Propquest. All very popular according to the feedback.</div>
<br />
We highlighted these at the recent Newark Hamfest.<br />
<br />
RSGB has now set up quicklinks to each of the tools, which will make it easier in the GB2RS audio bulletin. These are: <br />
<br />
<b>Propquest</b><br />
Shows real-time critical frequency and MUFs over various path lengths. Excellent tool for HF users.<br />
See <a href="http://www.rsgb.org/propquest">www.rsgb.org/propquest</a><br />
<br />
<b>Predtest</b><br />
Designed by Gwyn G4FKH, calculates the probability of propagation over different paths and for different modes. Includes point-to-point and animated displays.<br />
See <a href="http://www.rsgb.org/predtest">www.rsgb.org/predtest</a><br />
<br />
<b>VOACap for RadCom</b><br />
Shows the probability of propagation to 28 different locations around the world – the same locations used in the RadCom predictions. Can be tweaked for your particular station including mode, gain and power.<br />
See <a href="http://www.rsgb.org/voacap">www.rsgb.org/voacap</a><br />
<br />
<b>Proppy for RadCom</b><br />
Uses the latest ITURHFPPROP tool to calculate the probability of propagation to the same 28 locations used in RadCom.<br />
See <a href="http://www.rsgb.org/proppy">www.rsgb.org/proppy</a><br />
<div>
<br /></div>
</div>
Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com0tag:blogger.com,1999:blog-5480750694693825336.post-77960782446609871242019-03-10T13:16:00.001-07:002019-07-12T21:41:16.280-07:002019 Commonwealth Contest and QRP<div dir="ltr" style="text-align: left;" trbidi="on">
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi64DQmiCBfC6k2xXYy8f3lWTb-bvjv_wEOSYMqAkEvvphZ0is0SCKeohgv7z-iy-ajq6oBONzZsxboiNHvPVdO0rkbli_P1O1wRJAdXFwSj1S3sN_FNPXxygUbiWcaRoa8op2RkuWSJBk/s1600/Yaesu_817.jpg" imageanchor="1" style="clear: right; margin-bottom: 1em; margin-left: auto; margin-right: auto;"><img border="0" data-original-height="450" data-original-width="600" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi64DQmiCBfC6k2xXYy8f3lWTb-bvjv_wEOSYMqAkEvvphZ0is0SCKeohgv7z-iy-ajq6oBONzZsxboiNHvPVdO0rkbli_P1O1wRJAdXFwSj1S3sN_FNPXxygUbiWcaRoa8op2RkuWSJBk/s320/Yaesu_817.jpg" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">My Yaesu FT-817 and Winkey</td></tr>
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<br />
This weekend has seen the Commonwealth Contest 2019. I documented my <a href="http://g0kya.blogspot.com/2018/03/commonwealth-contest-2918-and-qrp.html" target="_blank">2018 attempt </a>on the blog, and was keen to give another go this year.<br />
<br />
Last year I used my Icom IC-756 Pro 3 wound back to 5W, but this year decided to use my Yaesu FT-817 for a real QRP approach. I bought a USB lead for it this year to give full computer control with N1MM and decided to use my Winkey for full auto CW .<br />
<br />
This year I had a slight change to my antennas. Out went the end fed half wave (with 80 loading coil) and in came a 66ft OCFD with the apex at about 8m. Also new was a quarter wave vertical for 20m, erected for the weekend on a 10m fishing pole - more of that later.<br />
<br />
The contest ran from 10am, but at 9.30am I was struggling with the computer and interface. Stupid me forgot to turn off the keyer on the FT817 - duh!. Soon we were under way.<br />
<br />
The contest got off to slow start with my 5W struggling to break through. Many stations just couldn’t hear me. The quarter wave vertical for 20m turned out to be a noise magnet - almost S8. I decided to abandon it quite quickly.<br />
<br />
After an hour I had a few stations in the log - 5B4AGN (Cyprus) and 9H1CG am (Malta), but nothing better. 3B8XF Mauritius (G3TXF) was audible, but I couldn’t break through. Same with ZF2CA Cayman Islands (both 3B8 and ZF were worked last year).<br />
<br />
The afternoon saw Canada romping in and I ended up doing an hour at about 10-11pm, clearing up the UK HQ stations.<br />
<br />
Sunday started at about 5.30am and a few more Canadians on 40m were cleared up. I then had a big breakthrough - VK4CT on 40m. It wasn’t easy, as they needed three or four repeats on their serial number, but we got there eventually.<br />
<br />
So there you go - 34 QSOs in total, which doesn’t sound much, but I didn’t take part for the full 24 hours and it is HARD work with only 5W. Peter M0RYB, a fellow Norfolk Amateur Radio Club member, cleaned up with 70 QSOs in the QRP section. Must find out his secret!<br />
<div>
<br /></div>
<div>
Note: The FT-817 isn't much of a contesting radio. I found it struggled with a nearby 400W station and also found the 500Hz filter a bit too wide. Might be back to the IC-756 Pro next year.</div>
</div>
Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com2tag:blogger.com,1999:blog-5480750694693825336.post-40417289854555249492019-02-04T09:20:00.002-08:002019-02-04T09:32:18.578-08:00HF propagation charts updated<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4eZlzS1D4lZdJA9P9cDZrwIzZOfaI0F-vQANe7Mz4Ax0j0UGpmM2_mbHC7GCWjxrfmT0u0TNXc40OcGjGftG_iivJ4URqDY9k-x3plpV1SfxaJlvq3mHZAF2nUa80HIMff8D3hvvPQrU/s1600/16UT-28MHz.gif" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="180" data-original-width="360" height="160" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4eZlzS1D4lZdJA9P9cDZrwIzZOfaI0F-vQANe7Mz4Ax0j0UGpmM2_mbHC7GCWjxrfmT0u0TNXc40OcGjGftG_iivJ4URqDY9k-x3plpV1SfxaJlvq3mHZAF2nUa80HIMff8D3hvvPQrU/s320/16UT-28MHz.gif" width="320" /></a></div>
I have just updated my HF short-path propagation prediction charts for the UK (accessed via a link on the right).<br />
<br />
I had to update them with the latest smoothed sunspot numbers for the next 12 months.<br />
<br />
This is a little depressing as after May 2019 the predicted SSN falls to "one" and stays like that for the rest of the year! Sunspot minimum is currently thought to be later this year, but could spill over into 2020.<br />
<br />
These charts are meant as a rough guide. Other tools that are available are:<br />
<br />
1. The <a href="http://www.voacap.com/radcom/" target="_blank">VOACAP RadCom prediction tool</a> - this replicates the locations found in the monthly RSGB publication, but lets you choose your own mode, power and antennas to give more accuracy.<br />
<br />
2. The <a href="http://www.predtest.uk/" target="_blank">Predtest.uk tool</a> - this tool, developed by Gwyn Williams G4FKH, uses the latest ITURHFPROP prediction engine to let you produce point-to-point or area propagation predictions, again with full control over the input parameters.<br />
<br />
3. <a href="http://www.propquest.co.uk/graphs.php" target="_blank">Propquest</a> - this is a near real-time tool, developed by Jim G3YLA, that shows the critical frequency and extrapolated maximum usable frequencies available over different path lengths. The critical frequency (the frequency at which a radio wave launched vertically stills gets returned to Earth) is derived from ionosonde data, mainly from Chilton and Fairford.<br />
<br />
It should be your first port of call to see what conditions are like. In the summer it also has predictions for Sporadic E, courtesy of Jim.<br />
<br />
Steve G0KYA<br />
RSGB PSC Chairman<br />
<br />
<br /></div>
Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com0tag:blogger.com,1999:blog-5480750694693825336.post-58198967893061022402019-01-21T06:58:00.000-08:002019-01-21T07:17:37.184-08:00Yaesu FT-991A firmware update warning<div dir="ltr" style="text-align: left;" trbidi="on">
I have owned a Yaesu FT-991A for about two years. I have to say that I really only use it on two metres. It isn't a bad radio, but it can be fiddly and you have to get used to going through lots of menus to do what you want it to do.<br />
<br />
As such I tend to use my Icom IC-756 Pro 3 as my main HF rig (unless I'm using one of my QRP rigs like the Elecraft K1, YouKits HB1A, QCX, MTR etc). Use the QRP tag on the right if you are interested in reading about them.<br />
<br />
Anyway, I recently tried to use Yaesu's Fusion mode as we have a new Fusion repeater (GB7NM) about 10 miles from me.<br />
<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiOCF8NnrNJlLGIkafiNiwL3ZDyMQV7_Wvqm4NfBGP9ZPosdQOy5rd3M9UL3LbBIlmx7QpTmmX8Rig0yihIQHeFxbpdrxCSfAqt6eYPXGn5B34Iow6oeDYQRGBq-dWttxlGhsNxeVzSpPI/s1600/FT991A.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="257" data-original-width="350" height="234" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiOCF8NnrNJlLGIkafiNiwL3ZDyMQV7_Wvqm4NfBGP9ZPosdQOy5rd3M9UL3LbBIlmx7QpTmmX8Rig0yihIQHeFxbpdrxCSfAqt6eYPXGn5B34Iow6oeDYQRGBq-dWttxlGhsNxeVzSpPI/s320/FT991A.jpg" width="320" /></a></div>
I wasn't impressed with the audio though. Half the time it was unintelligible and pretty awful to be honest. I did wonder if the signal strength is sufficient, but it is S9 +30db. Also, I live about half a mile from the police headquarters and do suffer some desensing on 2m if I use a cheap handheld like a Baofeng connected to my 2m antenna. Perhaps that's the problem.<br />
<br />
However, I checked and found that the FT-991A's firmware (including C4FM) was out of date and thought that an update might improve things.<br />
<br />
So, following the instructions, I first uploaded the main firmware - and this is where I came unstuck. Once I had completed it I rebooted the radio, but it wouldn't - all I had was the Yaesu screen.<br />
<br />
Arrrgghh! Now what. Reading around the internet I found that <b>you have to upload all four of the Yaesu firmware updates - the main, the TFT screen, the DSP and C4FM</b>.<br />
<br />
If you don't the radio won't work.<br />
<br />
To be fair it does say in the instructions: <br />
<br />
<b>IMPORTANT NOTICE:</b><br />
<b>MAIN Ver. 02-01 also requires TFT Ver. 02-00; also DSP Ver. 01-11 and C4FM DSP Ver. 04-15.</b><br />
<b>If your FT-991A does not have them already, please update all firmware, they must be used </b><b>together.</b><br />
<br />
Once I had uploaded all four and reset it all was fine again - apart from I had lost all my settings.<br />
<br />
Another quick hint. If you have memories loaded use <a href="http://www.vk2byi.com.au/ftrestore/" target="_blank">VK2BYI's FTRestore software</a> before you start the firmware update and make a copy of the memories. Once you have made the firmware updates you can then reload the memories and save yourself a lot of time.<br />
<br />
Anyway, after two hours of messing around I had the radio back the way I wanted it.<br />
<br />
So is Fusion better now? I still don't think the audio quality is that good, although it my be a bit better. But at least the radio isn't bricked!<br />
<br /></div>
Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com6tag:blogger.com,1999:blog-5480750694693825336.post-24051304383743264182018-11-01T04:06:00.002-07:002018-11-01T04:14:09.530-07:00Autumnal HF conditions show sunspots aren't everything<div dir="ltr" style="text-align: left;" trbidi="on">
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<tr><td class="tr-caption" style="text-align: center;">Click to enlarge</td></tr>
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<br />
Don't you just love it when something works! I took down my multi-band end fed half wave (EFHW) antenna last weekend and replaced it with a home-made 40m off-centre fed dipole (OCFD).<br />
<br />
The EFHW worked, but I was never happy with the performance. This may be due to the inverted L configuration or the compromise 49:1 ferrite-based Un-Un. Either way, I felt I was missing out on some DX and was keen to try something else for the Autumn/Winter.<br />
<br />
The <a href="https://g0kya.blogspot.com/2015/10/getting-more-bands-out-of-40m-ocfd.html" target="_blank">40m Windom</a> is about 66ft long and has a home-made 4:1 Guanella balun made with two ferrite cores. It is fed at the 41%/59% point so it covers 40, 20, 15 and 10m with an SWR below 3:1 and the other HF bands with an ATU.<br />
<br />
The apex is at about 8m with the ends down to about two metres, so not ideal.<br />
<br />
Nevertheless, in back-to-back WSPR tests it proved to be better than my <a href="https://g0kya.blogspot.com/2011/09/w5gi-mystery-antenna.html" target="_blank">W5GI dipole</a> that goes over the roof by about 7dB on average. This was good as the EFHW was mostly down on the W5GI.<br />
<br />
Anyway, I thought I would leave it running on 20m WSPR for 24 hours to see what it could pick up. This was with zero sunspots, but a Kp index of 1. I was delighted to see that I had been picked up as far afield as Japan, Australia, Alaska, Antarctica and Brazil. The furthest west I got in the US was Utah.<br />
<br />
So, I'm a happier bunny. I might return to the multiband EFHW one day, perhaps looking at different ferrite mix configurations for the Un-Un, but for now I'll stick with <a href="https://g0kya.blogspot.com/2010/11/efhw-monoband-end-fed-half-wave-for-10m.html" target="_blank">monoband EFHWs</a> with tuned iron toroid/capacitor matching units that work well.<br />
<br />
The OCFD can stay up for a while - you know that the best antenna you can have is either the one you just took down, or the one you are going to put up, not the one you are using!</div>
Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com1tag:blogger.com,1999:blog-5480750694693825336.post-36985602820557507302018-08-26T08:35:00.001-07:002018-08-26T11:29:04.423-07:00Predicting space weather – and how to get it wrong!<div dir="ltr" style="text-align: left;" trbidi="on">
Space weather prediction is an inexact science. We still don’t fully understand the Sun or how it works.<br />
<br />
This means that predicting what HF radio conditions are going to be like over the next seven days can be challenging – especially when you have to produce the forecast a couple of days before it is published.<br />
<br />
This week was a perfect example of how to get it wrong!<br />
<br />
I prepare the HF part of the RSGB’s GB2RS Propagation Prediction forecast on Thursday afternoon. Jim G3YLA looks at VHF and Sporadic E, before it is sent to John G4BAO who adds some more info on any microwave propagation such as rain scatter and also adds the EME report.<br />
<br />
I then edit it, add my HF predictions and send it to RSGB HQ so it can be collated, published and sent to GB2RS readers on Friday.<br />
<br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhihKEb7OqP8Lh1X3FGttmOcts-RhZv0BC9qaO3kgX2vDnKtREeHYoOKHWVuU6SlWAA4dU-q_gFF8VMyQ-2Nea6VAKLG1aNQ7BZfCgI4JTQCvw-QvCyN0KlsMbSHzYUeJ51Kd7Kvbj-JAo/s1600/Sunspots_aug23.jpg" imageanchor="1" style="clear: right; margin-bottom: 1em; margin-left: auto; margin-right: auto;"><img border="0" data-original-height="1024" data-original-width="1024" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhihKEb7OqP8Lh1X3FGttmOcts-RhZv0BC9qaO3kgX2vDnKtREeHYoOKHWVuU6SlWAA4dU-q_gFF8VMyQ-2Nea6VAKLG1aNQ7BZfCgI4JTQCvw-QvCyN0KlsMbSHzYUeJ51Kd7Kvbj-JAo/s320/Sunspots_aug23.jpg" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Sunspots on Thursday 23rd August 2018.</td></tr>
</tbody></table>
At that point this week the Sun looked fairly innocuous with one tiny sunspot group, a solar flux index of 70 and a sunspot number of 15, representing one sunspot group with five tiny spots.<br />
<br />
There were no obvious coronal holes and NOAA predicted the K index would likely be two all week due to a lack of geomagnetic disturbances. The US Air Force agreed.<br />
<br />
So far so good!<br />
<br />
At 04:45UTC on Monday 20th NOAA had reported:<br />
<br />
“Region 2719 (S06, L=133, class/area Bxo/010 on 19 Aug)<br />
developed in the SE quadrant on 19 Aug. No significant flare events<br />
occurred from either region. Other activity included a filament<br />
eruption centered near S11W04 observed lifting off the solar disk at<br />
approximately 19/0538 UTC. An associated coronal mass ejection was<br />
observed off the SW limb in SOHO/LASCO C2 imagery at 19/0812 UTC.<br />
WSA/Enlil modelling of the event suggested the ejecta was primarily<br />
directed westward of the Sun-Earth line and is not expected to cause<br />
any significant effects.”<br />
<br />
So the CME wasn’t earth-directed so shouldn’t be a problem – bear with me!<br />
<br />
The NOAA report for Monday 20th August said there were no events.<br />
The NOAA report for Tuesday 21st August said there was an RSP (a sweep-frequency radio burst) at 18:46UTC observed at Palahua, Hawaii, USA<br />
The NOAA report for Wednesday 22nd August said there were no events.<br />
The NOAA report for Thursday 23rd August said that at 20:23UTC on Thursday evening the older region 2719 emitted an an “A class” X-ray solar flare. “A class” flares are the weakest and it was after sunset in the UK so didn’t have any major impact for us according to the ionosonde data.<br />
<br />
But there were further A class flares on Friday 24th August, which were at 12:47-12:50 UTC, 21:54-21:58 UTC and 21:57-22:01 UTC.<br />
<br />
The Chilton and Fairford Ionosondes in the UK show Friday’s flare’s effect at 12:47 as there is a gap in the data.<br />
<br />
You can see this at Jim G3YLA’s Propquest site at: <a href="http://www.propquest.co.uk/graphs.php?type=archive" target="_blank">http://www.propquest.co.uk/graphs.php?type=archive</a><br />
<br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLVk5iQLcuIhYuku2rDvSDmSrKvgyX6VZCsl8R36fLw9F7G4XwT0Uw4uopHzWoql-gr4dmu687b1KQMLaQAvp3twzdQvi2MDNcSHUe-i58sphsqw0ug7Yuo5IgWdgYBNmBGvb3DBysxpg/s1600/Sunspots_aug25.jpg" imageanchor="1" style="clear: right; margin-bottom: 1em; margin-left: auto; margin-right: auto;"><img border="0" data-original-height="820" data-original-width="820" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLVk5iQLcuIhYuku2rDvSDmSrKvgyX6VZCsl8R36fLw9F7G4XwT0Uw4uopHzWoql-gr4dmu687b1KQMLaQAvp3twzdQvi2MDNcSHUe-i58sphsqw0ug7Yuo5IgWdgYBNmBGvb3DBysxpg/s320/Sunspots_aug25.jpg" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">But by Saturday 25th August a new large sunspot <br />
group had appeared.</td></tr>
</tbody></table>
By Friday another new sunspot group (2720) had emerged, which grew rapidly and by Saturday it was quite large. Sunspot AR2720 is not only large, but also strange. Its magnetic polarity is reversed. The North and South ends of its magnetic field are backwards compared to the norm for sunspots in decaying Solar Cycle 24.<br />
<br />
So could AR2720 be from the next solar cycle, Solar Cycle 25? We’ve already had one reverse polarity sunspot which has been attributed to Cycle 25, but that was last year. This is going to be discussed over the coming weeks.<br />
<br />
Action on Friday 24th August continued.<br />
<br />
From 02:00UTC a series of solar flares were recorded, mainly from the new region 2720. These were B-class solar flares.<br />
<br />
By the early hours of Sunday morning, 26th August the K index had started to climb, peaking at Kp7 at 03:00 and 06:0UTC. The bands on Sunday were lousy with a lack of signals across the board in the UK as the ionosphere collapsed. The 14.100MHz IARU beacons were all inaudible.<br />
<br />
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<tr><td class="tr-caption" style="text-align: center;">The Kp index hit 7 in the early hours of Sunday <br />
26th August 2018.</td></tr>
</tbody></table>
A sweep with my SDRPlay receiver and SDRUno software saw very few signals on 20m at all and virtually nothing higher in frequency. There were a few weak and watery CW signals from Germany on 40m.<br />
<br />
So what was the cause?<br />
<br />
NOAA now says there <b>had </b>been an earth-directed coronal mass ejection on Monday 20th August that no-one seemed to comment on at the time. NOAA’s own records don’t show any solar flares on Monday August 20th – see (<a href="ftp://ftp.swpc.noaa.gov/pub/indices/events/20180820events.txt" target="_blank">ftp://ftp.swpc.noaa.gov/pub/indices/events/20180820events.txt</a>)<br />
<br />
So was it this CME or the one on the 19th that is now reported as causing the high-speed solar wind stream that brought about the Kp7 event and auroral conditions? The experts seem to think so – now!<br />
<br />
Or was it a CME as a result of the solar flares on Friday 24th August? That to me would seem more likely and fit in with the roughly two-day solar wind transit time to Earth.<br />
<br />
SpaceWeather.com described it as a “surprise geomagnetic storm” and I think that’s a pretty apt description as no-one predicted it.<br />
<br />
If that is the case there is no way I could have known about it when I filed the copy to RSGB on Friday morning. This report predicted quiet geomagnetic conditions for the week commending Sunday 26th August – I don’t think so somehow!<br />
<br />
Oh, the joys of space weather and HF radio propagation forecasting!</div>
Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com0tag:blogger.com,1999:blog-5480750694693825336.post-66587751724991049292018-06-19T03:45:00.000-07:002018-06-19T03:50:14.666-07:00Fixing the 20m QCX radio<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiPmmIdsxfWpx8AyRosHh3AqkHnAjgcysbCykUeemlwqROE0CgnOLvqaBNgpSMIH8dx9DF32F6sdUJLrLyJSSeJBPIGX8gzifTWDrE3mtqtgeGxyvefYF4KbCdrO1nBt4K-qI1Xwrnx9tk/s1600/QCX_20m_radio.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="1200" data-original-width="1600" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiPmmIdsxfWpx8AyRosHh3AqkHnAjgcysbCykUeemlwqROE0CgnOLvqaBNgpSMIH8dx9DF32F6sdUJLrLyJSSeJBPIGX8gzifTWDrE3mtqtgeGxyvefYF4KbCdrO1nBt4K-qI1Xwrnx9tk/s320/QCX_20m_radio.jpg" width="320" /></a></div>
<br />
I've had my 20m QCX kit working now since just after Christmas. While the build was quite straightforward I did have a few problems.<br />
<br />
Click to enlarge the photograph by the way.<br />
<br />
The first was that I managed to blow the 7805 regulator while leaving the radio running on WSPR one morning. Having replaced that I found that the rig was quieter and there was no TX output any more. Thinking I had also blown the PA transistors I replaced all three of the BS170s, but that didn't help either.<br />
<br />
Anyway, after a lot of help on the QCX reflector I decided that the fault had also taken out the 74ACT00N chip. This had been soldered onto the board directly so had to be cut out with a Dremel and a new IC socket installed.<br />
<br />
And after finding a short somewhere near the PA transistors all was well - success! Output using a 12.6V Lithium battery pack was about 1.8W<br />
<br />
I have been using it on and off ever since as it has a really nice receiver - <a href="http://g0kya.blogspot.com/2018/05/bumps-on-air-2018-qrp-in-north-norfolk.html">even took it to North Norfolk</a> as I detailed in another post.<br />
<br />
But one thing always bugged me - why only 1.8W? When I built it originally I was getting more like 3W, so perhaps it was the replacement BS170 transistors, which came off Ebay on a slow boat from China.<br />
<br />
So having a few hours free today I ignored my own "if it ain't broke don't fix it" mantra and pulled it apart. I replaced all three BS170s with new ones bought from the GQRP club and while I was at it I replaced C22 with a 0.1uF capacitor to try and soften the sidetone a little.<br />
<br />
I managed to break one of the wires to one of the control buttons on the front in the process, but it is now all back together.<br />
<br />
And the power output is now just under 3W with 12.6V - success! I have no doubt I could get more if I messed around with the band pass filter, but I don't think it is worth it. I tend not to run it on 13.8V as the regulator gets VERY hot indeed.<br />
<br />
Anyway, it is a great little radio and will be going on some more journeys no doubt.<br />
<br />
I can thoroughly recommend it as a kit project - <a href="https://www.qrp-labs.com/">see QRPLabs site</a>. My case came from Banggood in China and only cost a few pounds. It did take about 10 hours to machine (posh word for drilling out with a Black and Decker and attacking it with a file).<br />
<br />
The label was produced in Photoshop and printed off by Photobox.co.uk. I ruined the first one by spraying it with varnish, which made the dye run. Luckily I have a few more spares and may eventually cover one in sticky-back plastic. But for now it looks great.<br />
<br />
The red buttons were bought just before Maplin went bust so are a lasting tribute to what was one of my favourite shops and the result of much ribbing by the family every time I went there - RIP Maplin.</div>
Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com4tag:blogger.com,1999:blog-5480750694693825336.post-13623668334540905722018-05-24T11:35:00.003-07:002018-11-01T04:18:23.602-07:00"Bumps on the Air" 2018 - QRP in North Norfolk, UK<div dir="ltr" style="text-align: left;" trbidi="on">
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Today was 2018 ”Bumps on the Air” day for me. Because we don’t have any summits in Norfolk I have to make do with tiny hills, or bumps! <br />
<br />
Two years ago Jim G3YLA and I climbed up Beeston Bump (63m) and did some amateur radio operating. This year I wanted to beat that so drove to Norfolk’s mightiest peak – Beacon Hill near West Runton at 103m. Ta dah!<br />
<br />
Actually, this wasn’t a very exciting spot as there are just two rotting benches, a flag pole and trees all around.<br />
<br />
Nevertheless, I set up my end fed half wave vertical on a 10m fishing pole and connected up my Yaesu FT817. There wasn’t too much about but I worked John F5VKU (also G8MM) near Cannes with 5W SSB. He said he was struggling to hear me.<br />
<br />
<div style="text-align: right;">
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<tr><td class="tr-caption" style="text-align: center;">My 20m QCX radio - click to enlarge any image.</td></tr>
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After playing with SSB for a bit and failing to break some pile ups I connected up my 20m QCX radio and tried some CW. I was really surprised as Karl IV3RJH came back to me, 559/549 both ways. I was running about 2W, he was running 3W.<br />
<br />
I do have to fix the sidetone on the QCX as calling CQ sounds more like “thump-de-thump-thump-thump-thump-de-thump”. I have the new capacitors, but am waiting for some new BS170 transistors so I can hopefully up the power level to more like 4W too.<br />
<br />
But the QCX is an amazing radio for the money and hey, I built it myself, complete with the case and custom label, so any QSO makes me smile.<br />
<br />
Another 20m SSB session with the FT817 and I bagged Jack OH3GZ and Juha OH6QAZ.<br />
<br />
At this point I packed away and after lunch headed for Beeston Bump on the coast near Sheringham. <a href="http://g0kya.blogspot.co.uk/2016/07/operating-qrp-from-beeston-bump-tg14-in.html">I’ve written about this before</a> as it has a fantastic view over the North Sea.<br />
<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh7_f2yV4pz3d4HYxJdtmU2CD-3dLoTp8Mu5vU_bnVqJ8Z7nhKPUgmgUvFkJpFOO0RRyqspW6V1J8_mv8zVhyBR_qy1mbHpH9jjjRMF6Pk3927AzD_EqVD4PZB1mVtMciiUKQwnwRmU_74/s1600/Beeston_Bump1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="800" data-original-width="600" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh7_f2yV4pz3d4HYxJdtmU2CD-3dLoTp8Mu5vU_bnVqJ8Z7nhKPUgmgUvFkJpFOO0RRyqspW6V1J8_mv8zVhyBR_qy1mbHpH9jjjRMF6Pk3927AzD_EqVD4PZB1mVtMciiUKQwnwRmU_74/s320/Beeston_Bump1.jpg" width="240" /></a>Anyway, I put up the EFHW vertical for 20m and set to with 5W CW from my Elecraft K1. This raised Gert OH/DL7UG and Dima RW4C. I then bagged Fabi IK5IiS near Florence.<br />
<br />
Also heard were stations in Cypus and Canada, but the Cyprus station on SSB couldn’t hear me and the Canadian seemed to be sending his life story in CW to another station and I got fed up waiting to call him!<br />
<br />
I also had a play with my 3W MTR3, but didn’t work anyone as I could see rain clouds coming and decided to pack up.<br />
<br />
So not a bad day’s radio. The Elecraft K1 and Yaesu FT-817 worked flawlessly. I think I was getting some RF into the keyer on the QCX as I had trouble sending “/P” – the “/” turned into a right mess sometimes, although I had no trouble sending it on the K1 with the same Palm Paddle.<br />
<br />
The moral is that life is NOT too short for QRP!<br />
<br />
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Update: I checked the reverse beacon network last might and saw that I had been picked up across Europe while calling CQ, but often with no response. Some of these SNR figures are quite large too. In other words I was loud enough.<br />
<br />
That's a shame as it would have been nice to have worked some more stations.<br />
<br />
Is this because of a lack of activity? Or is it because, as I often wonder, that a lot of people have moved to FT8?</div>
Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com0tag:blogger.com,1999:blog-5480750694693825336.post-90090017341974035432018-05-01T10:24:00.002-07:002018-05-01T10:25:35.835-07:00IBP propagation predictions for the UK for May 2018<div dir="ltr" style="text-align: left;" trbidi="on">
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<tr><td class="tr-caption" style="text-align: center;">Propagation predictions for the International Beacon Chain <br />
for the UK, May 2018.</td></tr>
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In an effort to try to make HF propagation predictions more accurate I have been playing with a different method of producing them using the ITURHFPROP software.<br />
<br />
Previously I had been calculating the field strength of each beacon and then converting that to an S point level. It was pointed out that this isn't the best way and that calculating the signal strength in dBm and then converting it would be better.<br />
<br />
They are based on 100W to a dipole at 10m - we know that the IBP chain use a Cushcraft R5 antenna.<br />
<br />
I then hit the problem as to what antenna gain do you use. This may sound simplistic, but in fact it isn't as the actual gain off a dipole will depend upon its height, its orientation and the required take-off angle.<br />
<br />
Now, the take-off angle will depend upon what ionospheric mode is dominant at that point in time. That is, is it one F-layer hop, two F-layer hops or a combination of E and F-layer hops.<br />
<br />
After a lot of thought and discussion I settled on setting the gain at both ends at 0dBi, which appears to give reasonable results - setting it at 2.15dBi gave over-optimistic results<br />
<br />
Anyway, attached is the plot of predictions for the beacon chain for May 2018. I'll check to see how accurate it is and adjust the input files accordingly. The ultimate goal is to the transfer these settings to other HF predictions.<br />
<br />
If anyone wants to report on whether they find these accurate or not please let me know. They are median predictions, which means some days may be better, some days worse.<br />
<br />
Just click on the chart to enlarge it.</div>
Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com2tag:blogger.com,1999:blog-5480750694693825336.post-26145215737467006272018-04-22T08:59:00.000-07:002018-04-22T09:04:15.634-07:00International Marconi Day 2018 from Caister Lifeboat<div dir="ltr" style="text-align: left;" trbidi="on">
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<tr><td class="tr-caption" style="text-align: center;">Chris G0DWV on the mic. with Roger G3LDI looking on.</td></tr>
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Norfolk Amateur Radio Club managed to contact 116 other radio amateurs in 23 different countries on Saturday 22nd April 2018 when we took part in the annual International Marconi Day (IMD) event to mark the inventor's birthday.<br />
<br />
This was the ninth year we've taken part.<br />
<br />
Using the call GB0CMS and a mixture of Morse code, telephony (speech) and data (FT8), contacts were made with other radio amateurs across the UK, Europe, and the USA.<br />
<br />
Notable contacts were made with other IMD stations in Italy, Ireland, Weston-Super-Mare and Poldhu, Cornwall – home of the Marconi Centre from where the inventor made the first transatlantic transmission in 1901.<br />
<br />
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We ran the all-day special event station at Caister Lifeboat to commemorate the village's original Marconi Wireless Station, which was established at Caister in 1900. The station was in a house in the High Street known as Pretoria Villa and its original purpose was to communicate with ships in the North Sea and the Cross Sands lightship.<br />
<br />
Conditions weren’t brilliant due to a major solar disturbance (effects of a coronal hole), but we were still able to cross the Atlantic on three occasions.<br />
<br />
We were picked up in Pennsylvania, US via FT8 at -20dB on the reverse beacon network, but didn't make any transatlantic FT8 QSOs.<br />
<br />
The equipment used was 100W maximum from an Icom IC-7400 (20m) and an Icom IC-7300 (80/40/30m). Antennas were a W5GI dipole on 40m and my design of a <a href="http://g0kya.blogspot.co.uk/2010/11/efhw-monoband-end-fed-half-wave-for-10m.html">monoband end-fed half-wave (EFHW) vertical for 20m</a>. The FT8 digital mode was used for the first time to show what can be worked with just 20-25W.<br />
<br />
We also used a Flex Maestro to remotely link into Malcolm G3PDH's home station via the internet and worked back to ourselves using his special First Class Operators' Club call for April, G4FOC. The Maestro is very impressive!<br />
<br />
Above all, it was great fun and a good social event</div>
Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com0tag:blogger.com,1999:blog-5480750694693825336.post-85498131729945500802018-03-11T14:12:00.000-07:002018-10-05T09:01:10.501-07:00 Commonwealth Contest 2018 and QRP<div dir="ltr" style="text-align: left;" trbidi="on">
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<tr><td class="tr-caption" style="text-align: center;">RSGB certificate for 5th place QRP section.</td></tr>
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<b>Update: It turns out I came 5th in the QRP section of the 2018 Commonwealth Contest. I lost two QSOs for being "not in log", and lost 4th place by 10pts to Dave G3YMC (which is how it should be!). Great fun and I'll do it next year, probably with my Yaesu FT817 and the addition of an EFHW vertical for 20m too.</b><br />
<br />
I took part in the 2018 Commonwealth Contest this weekend on HF CW. This was always going to be a casual entry as I had other things to get on with over the weekend, not least was helping tidy the house for Mothers’ Day on Sunday!<br />
<br />
I decided to enter the QRP category with a maximum of 5W. One reason was I knew that my good friend Dave G3YMC had won the category last year with 30 QSOs. I mean, how hard can it be to beat 30 Qs with 5W? Answer: very hard apparently!<br />
<br />
I got going with 20m and quickly worked four stations in Malta and Cyprus. I also cracked off some of the UK HQ stations on 80m for 25pts apiece.<br />
<br />
The afternoon saw openings to Canada, which brought in a few VEs. I was also happy to work the Cayman Islands and G3TXF on Mauritius.<br />
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<tr><td class="tr-caption" style="text-align: center;">My multiband fan dipoles in the loft. <br />
Only used with QRP for EMC reasons.</td></tr>
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<br />
Ionospheric propagation conditions were lousy with no sunspots and a geomagnetic disturbance the night before. Fifteen metres was closed so it was a 80, 40 and 20m only event.<br />
<br />
What you quickly realise is that many stations are using the full legal limit, so might be running 400-1,000W. If they aren’t very strong they probably won’t hear your 5W QRP station - fact of life!<br />
<br />
So there were lots of “NR?” being sent for repeats, if they came back at all.<br />
<br />
I went to bed about 23:30hrs and set to again at 06:45hrs. At that time 20m was dead, but there were some 40m and 80m contacts to be had and I managed to get VE in the log again. I also swept up the remaining G, GD, GI, GJ, GM and GW HQ stations as these were quite easy with 5W.<br />
<br />
The antennas were my loft-mounted fan dipoles for 40-10m, which beat the outdoor multiband 80-10m end-fed half wave and W5GI dipole on 20m - go figure. I used the EFHW or W5GI for 40m and 80m, depending on which gave the best signal.<br />
<br />
The “nearly” category included QSOs with Singapore, Australia, Gibraltar, New Zealand and Zambia - I just wasn’t loud enough. But hey, Cayman Islands, Canada, and Mauritius on 5W will do me!<br />
<br />
Next year if I do it again with 5W I might put up a monoband 20m EFHW and perhaps use my Yaesu FT-817 (I don’t currently have a CAT cable for it), although the IC-756 Pro3 band scope is handy and it is an excellent rig, even when backed off to 5W. Logging/keying was with N1MM+, which worked flawlessly.<br />
<br />
All good fun and 30 Qs won’t win it ( the highest QRP entry so far is C6AKT with 92 QSOs), but my unconfirmed overall score was higher than the 2017 winner’s, so not too shabby.<br />
<br />
The Commonwealth Contest is a great one-weekend opportunity for UK stations to work DX with no big pileups.<br />
<br /></div>
Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com0tag:blogger.com,1999:blog-5480750694693825336.post-10664802780303386692018-01-23T08:00:00.001-08:002018-01-23T08:36:41.623-08:00IBP beacon predictions for UK using ITURHFPROP<div dir="ltr" style="text-align: left;" trbidi="on">
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Over Christmas and the New Year I got better acquainted with the ITURHFPROP propagation prediction software.<br />
<br />
This is the software that Gwyn G4FKH uses to produce the monthly HF predictions for RSGB’s RadCom magazine and which was produced by the ITU. <br />
<br />
Gwyn adapted it to produce a graphical output, which can be found at <a href="http://www.predtest.uk/">www.predtest.uk</a><br />
<br />
But I was intrigued to see if I could use it to produce some predictions for the worldwide International Beacon Project (IBP) chain that runs on 14, 18, 21, 24 and 28MHz. I won’t go into too many details here about the IBP network as you can find all you would want to know at <a href="http://www.ncdxf.org/beacon/">http://www.ncdxf.org/beacon/</a><br />
<br />
The good news is that as they all use the same power output (100W max.) and the same antenna (pretty much a unity gain or +2.15dBi antenna) it should be fairly easy to model what the expected signal strength should be here in the UK.<br />
<br />
ITURHFPROP runs in Windows and uses an input file with all the parameters needed, such as your QTH lat. and long., the transmitter’s lat. and long., required SNR, bandwidth, smoothed sunspot number, power etc etc.<br />
<br />
You then run it from the command line and it creates an output file.<br />
<br />
I ended up creating input files for each of the beacons, and a spreadsheet that can take each of the output Field Strength (dB(1uV/m)) figures and convert them into S units.<br />
<br />
I then created a batch file that runs all of the predictions for each of the beacons in one go. With an I5 processor this takes less than about 15 seconds.<br />
<br />
The spreadsheet then formats these so that I can produce the chart you see on the page. This may sound long-winded, but it really doesn’t take long. I’m sure someone with Python programming skills could automate the whole thing, but I wanted to make sure it worked first before going any further.<br />
<br />
The end result has proved to be quite accurate and shows that at this point in the sunspot cycle we can’t expect miracles in terms of hearing the distant beacons. While some are audible on 14 and 18MHz, generally we are not hearing much above that.<br />
<br />
In the UK, what have been audible quite regularly this month on 14.100MHz are RR90 (Novosibirsk, Siberia), CS3B (Madeira), 4U1UN (New York) and occasionally 4X6TU (Tel Aviv).<br />
<br />
It also shows what the effect of an elevated K index can be as this generally means the beacons are less audible (if there at all) as the MUF declines. We have been suffering from the adverse effects of <a href="http://g0kya.blogspot.co.uk/2016/09/coronal-holes-causing-chaos-on-hf-bands.html">coronal holes</a> recently and that isn't going to end any time soon.<br />
<br />
You can see the predicted MUF over different path lengths in near real-time using the graphed ionosonde data for the UK at <a href="http://www.convectiveweather.co.uk/ionosphere/graphs.php?type=live">http://www.convectiveweather.co.uk/ionosphere/graphs.php?type=live</a><br />
<br />
This was produced by fellow RSGB Propagation Studies Committee member Jim G3YLA and his colleagues at Weatherquest in Norwich.<br />
<br />
I’ve posted the predictions here to see if they are of interest to anyone. If they are I’ll update them monthly. <br />
<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjUyS-7qwQWiwKRAZwHXpdKTOEMOyQLAuSYKmCH9kZpV0748gpfNERVZOZ28A0Q6DtWuWjB4YJ1sWHUE4BCoLMBE77oIe1NH361y2qIY4W1e8bAeiiYNVhwz2an79D-ad1zdSMD2ocW7AY/s1600/IBP_Beacon_Predictions_for_January_2018.jpg">To view the January IBP prediction chart full size just click here.</a><br />
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Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com1tag:blogger.com,1999:blog-5480750694693825336.post-91071700510162497642017-12-22T05:18:00.001-08:002017-12-22T07:24:04.166-08:00Radio Caroline back on Medium Wave<div dir="ltr" style="text-align: left;" trbidi="on">
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<tr><td class="tr-caption" style="text-align: center;">The Orford Ness masts</td></tr>
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If you fancy a bit of nostalgia you can now listen to Radio Caroline again on 648kHz AM on the medium wave.<br />
<br />
The famous pirate radio station needs little introduction, but is now broadcasting legally using (ironically) the famous Orford Ness antenna system on the Suffolk cost, formerly used to transmit the BBC World Service in English around the clock on 648 kHz from September 1982 until March 2011.<br />
<div>
<br />
The station was founded in 1964 to play pop music all day at a time where broadcasting was dominated by the BBC and pop was played for an hour a week.<br />
<br />
Caroline was one of five stations granted a community radio licence by Ofcom and is now running 1kW, but with a really good antenna mounted right next to the sea.<br />
<br />
The station is 59+20dB at my home QTH 10 miles south of Norwich (JO02NN) using a Perseus SDR and a homemade 1m active loop mounted in the loft. It is also easily heard with a portable radio.<br />
<br />
Radio enthusiasts around Europe might like to listen for it.<br />
<br />
<b>More information:</b><br />
<br />
Orford Ness transmitter:<br />
<a href="https://en.wikipedia.org/wiki/Orfordness_transmitting_station">https://en.wikipedia.org/wiki/Orfordness_transmitting_station</a><br />
<br />
Radio Caroline:<br />
<a href="http://www.radiocaroline.co.uk/">http://www.radiocaroline.co.uk/</a><br />
<br />
<br />
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-->Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com0tag:blogger.com,1999:blog-5480750694693825336.post-37222379847608907742017-12-15T09:06:00.004-08:002021-02-18T14:15:14.577-08:00Propagation prediction maps updated until June 2018<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4eZlzS1D4lZdJA9P9cDZrwIzZOfaI0F-vQANe7Mz4Ax0j0UGpmM2_mbHC7GCWjxrfmT0u0TNXc40OcGjGftG_iivJ4URqDY9k-x3plpV1SfxaJlvq3mHZAF2nUa80HIMff8D3hvvPQrU/s1600/16UT-28MHz.gif" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="180" data-original-width="360" height="160" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4eZlzS1D4lZdJA9P9cDZrwIzZOfaI0F-vQANe7Mz4Ax0j0UGpmM2_mbHC7GCWjxrfmT0u0TNXc40OcGjGftG_iivJ4URqDY9k-x3plpV1SfxaJlvq3mHZAF2nUa80HIMff8D3hvvPQrU/s320/16UT-28MHz.gif" width="320" /></a></div>
I have now updated my propagation maps with the latest predicted smoothed sunspot numbers for the period up until the end of June 2018.<br />
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<a href="http://www.infotechcomms.co.uk/propcharts/" target="_blank">You can access them using this link.</a><br />
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The sunspot numbers continue to fall as we head towards sunspot minimum sometime around 2019.<br />
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If you use the charts look for about 60-70% reliability for SSB (yellow or hotter) and perhaps 40-50% for CW or PSK (green). For FT8 you may be able to work stations where the reliability is down to 20-30% (blue).<br />
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Of course, these are a guide and if you want to try making charts for your own station I recommend the online software at either <a href="http://voacap.com/">voacap.com</a> or <a href="http://www.predtest.uk/">www.predtest.uk/</a><br />
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Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com1tag:blogger.com,1999:blog-5480750694693825336.post-43118412483820373832017-11-21T00:36:00.000-08:002017-11-21T01:21:04.891-08:00Christmas present ideas!<div dir="ltr" style="text-align: left;" trbidi="on">
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As Christmas is coming, I thought I would remind people that there are some great radio-related goodies for sale at CafePress.co.uk and .com.<br />
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You can choose from a number of items, including:<br />
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<li>Three different types of ship's radio room clock, with silent period sectors marked</li>
<li>"Remember QRT SP" Merchant Navy Radio Officer merchandise</li>
<li>"Keep Calm and Work Some DX" merchandise</li>
<li>"Keep Calm and Work Some CW" items</li>
<li>Nikola Tesla merchandise, featuring him sitting in his Colorado Springs laboratory in 1899, surrounded by electrical arcs.</li>
</ul>
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You can have the last three slogans added to T-shirts, sweatshirts, mouse mats, calendar, mugs and much more.<br />
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<a href="http://www.cafepress.com/theradioroom" target="_blank">Just go to the Radio Room!</a><br />
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Or there are a number of my radio-related books that make good presents , including "Radio Propagation Explained", "Antenna Modelling", "Stealth Antennas" and "Getting Started in Amateur Radio". Use the image links on the right for more information.<br />
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Steve Nicholshttp://www.blogger.com/profile/03564402221894277279noreply@blogger.com0