171MHz signal

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Joined: Sat Nov 04, 2017 1:11 pm

171MHz signal

Post by plagoutte » Sat Nov 04, 2017 1:23 pm

Hello !

I have a signal on 171.447MhZ, and I can't identify it ...
Does someone know what is it ? Thank you in advance :)

I already tried FLEX, AFSK1200 and P25.
signal.png (290.11 KiB) Viewed 2026 times

Posts: 145
Joined: Tue Dec 27, 2016 11:00 pm

Re: 171MHz signal

Post by snn47 » Sat Nov 04, 2017 8:30 pm

Except for airborne and satellite operated transmitter, VHF is limite to Radio Line of sight. Since only you know which ITU-region, country and location you are located it, it will be hard to deduct the source. Are you shure it is a real signal and not some intermodulation product of other strong signals. Using a wide resolution for a narrow band signal also doesn't help.Check ITU-RR, which services have been awarded a primary and secondary status. Furthermore states can, based uppon ITU-RR 4.4, allow other uses/signals to operate in a band, if the signals do not interfere with use in adjacent countries.

If it is a notified service this should allow you to find more information on this signal.

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