Talk:Nknown 472p875

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I'm in Gawler area and don't pick this up. Could be local interference?

This could be a form of AQAM. If you zoom in closely youll notice the way the carrier is, being FMFrequency Modulation with angled sidebands. Now I dont know what this form belongs to as far as this one is concerned. Some forms of AQAM also sound like a fax machine if it produces nothing but noise. --Ywsia (talk)

RE: Nknown 472p875[edit]

I have the same interference on VHFVery High Frequency (30-300 MHz) from around 160-165 it gets worse near 163-164 the signals are all so strong it wipes out other signals.

I am convinced it is local interference from something but for the life of me i cannot figure out where it is coming from, I have tried turning my power off in my home so if it's something inside my home it should have stopped but it still there.

I have also walked all around my home with a handheld transceiver and the signal does not change or fade in and out.

-- Update -- @Kj6psg

I don't think it is a data signal, The result of the sample from the discord chat might just be random garbage or possibly from a signal underneath the noise.

I found one frequency that i can hear voice while the noise is still there from a local taxi company near me. The noise goes a little quite when they transmit but when they unkey the noise comes back.

If the taxi company was receiving interference i'm pretty sure they would have reported it to have it tracked down the fix the problem.

I'm in the UK btw.

RE: Nknown 472p875[edit]

Another sample of this signal popped up in the Discord chat. It's composed of 48 slots, each 125msec in length. One of the slots is replaced by the sync pattern, which on the Discord sample appeared to be the 16-bit pattern 0000001100101000 in AFSKAudio Frequency-Shift Keying. The high-rate data is probably some PSKPhase-Shift Keying. The data is conveyed as audio on a FMFrequency Modulation carrier, without pre-emphasis (flat Tx audio). --Kj6psg (talk) 18:50, 8 October 2019 (NZDT)

I hear this and I'm located in New Zealand.

151.1125, 151.200, 151.400.

Unknown Signal[edit]

I'm also in New Zealand and have found this same signal on 151.650 MHzMegaHertz (MHz) 10^6 Hz (Channel EN73). It's owned by Vital Ltd (formerly TeamTalk) and they mostly work with digital radio. No idea what it is and I would really like to know and if it's possible to decode it.

Trunking Mode[edit]

In Melbourne this system is used for the taxi network. --Mikideez (talk)