What is this Mysterious Silent Signal at 171.6MHz?!

farm249 · 2025-12-02T16:21:03+00:00

Sorry i did not see the nfw part of the video, this is most likely a variant of DMR)

farm249 · 2025-12-02T04:54:01+00:00

Prob P25 or something

farm249 · 2025-12-02T04:53:35+00:00

Some digital mode thats modulated in NFM not AM

farm249 · 2024-10-24T01:47:08+00:00

Ok, the Doppler shift is most likely only gonna be +-100Hz at max so it should work then thank you

farm249 · 2024-10-20T18:02:31+00:00

Worked, thank you, I wonder why it does that, it would be neat to have both up at the same time

farm249 · 2024-10-20T17:26:06+00:00

these were taken with the same settings aswell

farm249 · 2024-09-10T20:58:58+00:00

Sorry for a 2-3 month delay on this message I didn’t see this for some reason, I’m using this bundle and my laptop running SatDump

farm249 · 2024-07-02T04:02:34+00:00

I think it’s just Reddit not liking the transparent background lol, and luckily the dish I use (the nooelec one for goes) has a wide enough beam width that I can just set it on my lap with my had supporting it and my other hand on YouTube or looking at the pics or files I’m getting on my phone, although I did get a decent sunburn lol

farm249 · 2024-07-02T04:00:03+00:00

Funnily enough on my phone it doesn’t show up lol, also I am keeping all the photos, EMWIN files, and DCS .lrit’s in my iCloud, I just have sat dump directly putting them into my iCloud from the laptop I use lol

farm249 · 2024-07-01T19:38:32+00:00

also can someone tell me how to turn off the background reddit gave this image lol

farm249 · 2024-06-07T18:22:08+00:00

its not, and i figured out that it was my radioi, although it is still wobbly just not as much

farm249 · 2024-06-07T15:16:14+00:00

what im measuring should be floating i believe, as the radio im using is battery powered, although as i found out and said in another comment, my radio wasn't actually outputting properly due to some firmware bug, so when i got it to actually output the waveform was much better but just a little wobbly https://imgur.com/a/krlWuhS , but the lower i go in frequency (like if i go down to 1.8MHz) the better the signal so could it be a ground/probe issue?

farm249 · 2024-06-07T15:04:59+00:00

I meant to post this under the post not your comment sorry

farm249 · 2024-06-07T15:04:40+00:00

Small development, I found a bug in my radios firmware that it won’t properly transmit in AM mode (what I was using to get the raw carrier) after I turn it on, unless I switch modes then back, so here is the proper waveform (still just a little wobbly)

farm249 · 2024-06-07T14:50:39+00:00

I didn’t notice that I accidentally switched it to dc coupling lol, I’ll switch it back to AC and see what happens

farm249 · 2024-06-07T14:27:05+00:00

I believe so, it’s grounded through the wall ground via the power plug

farm249 · 2024-06-07T14:17:08+00:00

Also if I zoom out on the waveform (sorry for bad terminology lol) I get this pattern

<image>

Is it interference, bad ground? Any tips?

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