**Nivex 🐧 📻** @nivex@octodon.social · Jun 17, 2018, 01:57

**Nivex 🐧 📻** @nivex@octodon.social · Jun 17, 2018, 01:57

Nivex 🐧 📻 @nivex@octodon.social

I've got a signal here I can't figure out what it is, despite spending some quality time with sigidwiki.com :

https://www.nivex.net/images/tmp/mystery-signal-454337500.wav

Audio is recovered from FM demodulator.

Hoping @rey or some of the #hamradio folk might know what it is.

**Ed W8EMV** @w8emv · Jun 17, 2018, 02:40

**Ed W8EMV** @w8emv · Jun 17, 2018, 02:40

@nivex @rey

Sounds maybe like a radar?

What's the frequency you picked this up from? Did you have a waterfall to look at? How wide is the bandwidth?

**Nivex 🐧 📻** @nivex@octodon.social · Jun 17, 2018, 02:44

**Nivex 🐧 📻** @nivex@octodon.social · Jun 17, 2018, 02:44

@w8emv @rey I thought maybe it was some kind of paging system. On very rare occasions it does deviate from that idle rhythm. It's much narrower than the other paging systems I've seen though, and it never unkeys.

**Ed W8EMV** @w8emv · Jun 17, 2018, 02:53

**Ed W8EMV** @w8emv · Jun 17, 2018, 02:53

@nivex @rey

http://wireless.fcc.gov/auctions/data/bandplans/pagingLwrband.pdf

lists it in the pager band plan as channel "GN". Maybe look up your location on https://www.radioreference.com/ and see if that pans out.

If you are in Minnesota, that channel is listed at https://wiki.radioreference.com/index.php/Mobile_Radio_Engineering_(NXDN)_DSDPlus.frequencies as an NXDN frequency (trunked digital voice).

**Nivex 🐧 📻** @nivex@octodon.social · Jun 17, 2018, 03:03

**Nivex 🐧 📻** @nivex@octodon.social · Jun 17, 2018, 03:03

@w8emv @rey RadioReference pretty much only has voice stuff around here.

FCC's geosearch has been essentially inop the last couple weeks, so I searched by licensee state and hoped for the best. I think this is it: http://wireless2.fcc.gov/UlsApp/UlsSearch/license.jsp?licKey=2422846

So yes, very likely paging. Question is, what protocol is that? It doesn't appear to be anything in multimon-ng's vocabulary.

**Ed W8EMV** @w8emv · 2018-06-17T03:15:06Z

Ed W8EMV @w8emv

@nivex @rey

Here's a RadioReference page about Part 22 paging channels

https://wiki.radioreference.com/index.php/Part_22_Paging_Channels

It looks like these are paired channels - have you gone 5 Mhz up to the 459.3375-459.3625 and looked for traffic there too?

Jun 17, 2018, 03:15 · Web · 0 · 0

**Thomas B. Rücker** @tbr@society.oftrolls.com · Jun 17, 2018, 07:26

**Thomas B. Rücker** @tbr@society.oftrolls.com · Jun 17, 2018, 07:26

@w8emv @nivex @rey according to the models listed I'd expect to see Motorola Flex or POCSAG traffic on their frequencies. Might be slow POCSAG to improve link budget and thus building penetration and range.
I'd probably look at IQ and eye diagram.
For decoding multimon-ng seems a decent option. CF. http://www.hagensieker.com/blog/page/?post_id=73&title=reading-other-peoples-pager-traffic-and-shit

**Nivex 🐧 📻** @nivex@octodon.social · Jun 17, 2018, 17:44

**Nivex 🐧 📻** @nivex@octodon.social · Jun 17, 2018, 17:44

@tbr @w8emv @rey I tuned the VHF frequency listed in the company's docs and that is definitely POCSAG. This UHF signal is something entirely different.