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@g7izu@universeodon.com · 5d ago
Radio Propagation A ridge of high pressure pushing down the North Sea is creating ideal conditions for some strong tropospheric propagation. #radiopropagation #amateurradio #g7izu
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@moira@mastodon.murkworks.net · Apr 11, 2026
okay so let's think this out I have a UHF antenna at a not well known height pinging a location gmaps says is 1084 meters away (line of sight). We'll call the altitude of that location 0m to simplify maths. Openmaps has it on the low side of a 20m line. That matters to get actual altitude at the end; at most, it's another 2-3m down probably? At 850m (straight-line) from my 0m location, a signal clears a +70m hill on its way to either end. So start at 0m and create a right triangle with the signal path, and 70/850 should be the tan() of the angle from the 0m point. Therefore 70/850 = X/1084, and doing the maths gets you X = 90m. 90+20=110m, ish. But my best direct estimate from the same topo maps is 93-95m. #gmrs #AmateurRadio
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In reply to
@moira@mastodon.murkworks.net · Apr 11, 2026
Being at +93ishm _does_ clear the +70m hill (90m actual) but not at an angle that should let me see the 0m points - but I do. So. Bouncy signals? Bad maths? Weird RF-over-angle behaviours? (Same kind of thing gets you picket fencing) I dunno. hm I don't think I'm fucking up my maths but am I? Or is this "don't mix google maps and open maps it only leads to pain"? #gmrs #AmateurRadio
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@g7izu@universeodon.com · Apr 07, 2026
Space Weather Ops Dashboard I've released another update today (version #260407.3). The DRAP map includes a flashing indicator to show which base location is active in the path estimator table. Two new (optional) columns have been added to the path estimator: The GREYLINE column shows when the sunrise/sunset terminator is crossing the midpoint of a radio path — grey line conditions can briefly boost long-distance signals as the D-layer fades but the F-layer stays strong. The ↓F number tells you how many solar flux units (SFU) conditions can deteriorate before your best open band closes — the lower the number, the more fragile the opening. The ↑K number shows how much the geomagnetic storm index (Kp) can rise before the path degrades — useful during unsettled space weather when conditions can change quickly. Please go to the launch page or reload the page to ensure you're using the latest version. https://www.tvcomm.co.uk/g7izu/space-weather-ops/ #spaceweather #radiopropagation #amateurradio #g7izu
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@g7izu@universeodon.com · Apr 04, 2026
Radio Propagation And here we see the fly-through with the 10m band added to the mix. #radiopropagation #amateurradio #g7izu
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@g7izu@universeodon.com · Apr 03, 2026
Radio Propagation 3D fly-through showing 10m and 6m propagation between South and North America, recorded just now. The orange clouds (which are drawn a bit too bright!) denote zones of signal refraction for TEP (Trans-Equatorial-Propagation). #radiopropagation #amateurradio #g7izu
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@g7izu@universeodon.com · Apr 01, 2026
Radio Propagation The VHF/UHF FT8 Activity Contest kicked off at 18h UT. See the contesters on this flythrough aver Europe. 2m band contacts are the red lines, and as the contacts are mostly tropospheric, the signals are hugging the surface of the planet within a few km. It's fitting that Dave, G7RAU (and author of LiveMUF) is one of the contacts seen in this video (at the bottom end of Cornwall). #radiopropagation #amateurradio #g7izu
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@g7izu@universeodon.com · Mar 30, 2026
Radio Propagation 10m band (28 MHz) radio propagation between Europe and N America is poor this afternoon. From Europe, the band is open to S America, S Africa and the Far East. #radiopropagation #amateurradio #g7izu
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@g7izu@universeodon.com · Mar 28, 2026
Radio Propagation While we wait for the sporadic-E season to get going properly, here's a demonstration fly-through of this afternoon's global 10m to 2m band propagation, recorded live from amateur radio DX Cluster data with a five-minute cadence, at 17h07 UT 28 March. The yellow lines denote 10m contacts. As you can see, there's not much going on above the 10m band at the time of the recording. All the lower bands have been supressed so as to make 10m clearer. The number of hops and reflection locations any particular signal path makes is estimated and not real, but is based upon real factors such as ionosphere height, propagation mode and the MUF. Different frequencies reach different heights, as future videos will show. #radiopropagation #amateurradio #g7izu
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@g7izu@universeodon.com · Mar 27, 2026
New Website Addition I've just release a new space weather and amateur radio dashboard on my website. "Space Weather Ops" is a collection of live data indicators, graphs and data panels showing live solar wind and information derived form the amateur radio DX Cluster. Link to the launch page: https://www.tvcomm.co.uk/g7izu/space-weather-ops/ #spaceweather #amateurradio #g7izu
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@SitaDulip@gamepad.club · Mar 22, 2026
Spent several hours today on Radio stuff, which was nice. I still can't quite get my whips to work as I expect them to, but I suspect maybe it has to do with using a Faraday cloth instead of radials. Something to look into. I made two QSOs on 20m band, which I think is OK considering I'm set up in between houses and the bands have been hot garbage this weekend... #HamRadio #AmateurRadio
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@moira@mastodon.murkworks.net · Mar 05, 2026
DC light ON ^_^ #AmateurRadio #GMRS #3dPrinting #PowerSupply
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@g7izu@universeodon.com · Mar 04, 2026
Amateur Radio Does anyone know M0HAO? This OM is operating FT8 on 2m in the UK. He's spotting local contacts as "AUR" all over the place. Someone please have a word and encourage him not to spam the system? #amateurradio #g7izu
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@wisteela@mastodonapp.uk · Feb 24, 2026
Four years ago today Ukraine on EchoLink on day of invasion https://youtube.com/watch?v=wUnQjeR6Bvg&si=jBp-WcsdHmA4fiKD #Ukraine #UkraineWar #AmateurRadio
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