Hearing strong interference. Can someone identify the type? Audio attached.

[WRNU354]

Lately I have been receiving what sounds to me as intermittent short bursts of very strong interference on the GMRS channels.

Its strong enough to break sql of 7 and sometimes 9 on my KG-XS20G+.

It seems to occur on most any of the GMRS channels in short bursts and occassionally I can hear weak voice audio mixed in with it.

The bursts can occur quickly one after another or infrequently.

Audio files samples attached.

Any ideas on the source?

Thanks!

 

 

 

 

[OffRoaderX]

That's not "interference" per-se, that is someone transmitting digital data.. Some of the higher-end radio dorks can probably identify it based on the sound, but its probably NXDN.. or DMR.. Or possibly (although I don't think so based on the sound) P25.

[SteveShannon]

 

To me those short sound files sound like DMR. Here is a longer sample, followed by a Morse code ID. I recorded it from our 70 cm DMR repeater. 

[WRNU354]

10 minutes ago, SteveShannon said:

 

To me those short sound files sound like DMR. Here is a longer sample, followed by a Morse code ID. I recorded it from our 70 cm DMR repeater. 

You nailed it! The occurances have been increasing in recent weeks. Annoying as an impact wrench at church.

Thanks!

[SteveShannon]

1 minute ago, WRNU354 said:

You nailed it! The occurances have been increasing in recent weeks. Annoying as an impact wrench at church.

Thanks!

Set a receive tone so you don’t hear it. 

[WRNU354]

20 minutes ago, OffRoaderX said:

That's not "interference" per-se, that is someone transmitting digital data.. Some of the higher-end radio dorks can probably identify it based on the sound, but its probably NXDN.. or DMR.. Or possibly (although I don't think so based on the sound) P25.

As you predicted, a higher-end radio dork verified it is DMR. 

On GMRS, I find this DMR has all the charm of an impact wrench.

[SteveShannon]

1 hour ago, WRNU354 said:

As you predicted, a higher-end radio dork verified it is DMR. 

On GMRS, I find this DMR has all the charm of an impact wrench.

Can I add HERD (higher end radio dork) after my name now? 

[WRNU354]

3 minutes ago, SteveShannon said:

Can I add HERD (higher end radio dork) after my name now? 

Only the Queen of GMRS can formally bestow such a noble title and you are certainly deserving of it!

 

Not mentioned in my post the DMR intrusion may be more serious than just local effects on my GMRS experience.

In Chicago the CPD communicates in the clear on 8 FM channels from 460.125 MHz to 460.525Mhz

I scan them when I'm working in my office and I'm hearing the same "DMR" intrusion.

Hopefully it just some clown in my immediate area and not worse.

 

Again, thanks for your help!

 

 

[WRYZ926]

57 minutes ago, SteveShannon said:

Can I add HERD (higher end radio dork) after my name now? 

The Queen of all that is GMRS has anointed you so. YES go forth Sir SteveShannon HERD