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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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@moira@mastodon.murkworks.net · Mar 05, 2026
DC light ON ^_^ #AmateurRadio #GMRS #3dPrinting #PowerSupply
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@moira@mastodon.murkworks.net · Feb 25, 2026
They talk! :D The power supply is holding 12.14V at high power transmission, which makes the radio happy, the radio doesn't seem to mind the antenna (which has a replacement rod I cut to the right theoretical length, hopefully the right actual one lol, replacing the original) and the little blue HT is talking to the base unit nicely. Like it should! This should not be a surprise, but it's nice that it's all behaving so far. ^_^ #radio #gmrs
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@moira@mastodon.murkworks.net · Feb 24, 2026
new (to me) radya all cleaned up ^_^ (gmrs/frs) (it was reasonably clean already I just made it cleaner, there was sticker residue and such) #radio #gmrs #frs
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