Digital noise on analog conv

dave3825 · Jun 26, 2016

I have a few freqs in a favorite list where the audio type is set to all and I am getting digital noise . If audio type is set all, should I be hearing digital noise or should it be being decoded?

I also had another freq entered twice in a different list, one as analog search, and the other as nac search. On that one it was digital noise on the analog search freq.

FWIW I am running the latest dmr candidate but these freqs are not dmr, they are P25 phase 1.

Thanks

buddrousa · Jun 26, 2016

It may be NXDN or some other flavor that our scanners do not decode yet. I have seen over the last year or so a rise in unlicensed digital radios due to the fact no one could hear them or find out who they were. But I see that changing now that we can start monitoring them. I have a 4 channel DMR site near me that has been in use for over a year and the nearest licensed user is over 200 miles away licensed as a Electric Company and I am hearing local farmers.

dave3825 · Jun 26, 2016

buddrousa said:
It may be NXDN or some other flavor that our scanners do not decode yet.

Its definitely p25 phase 1 as I have sdrsharp and dsd going and thats what it showed. Also comes up here in the db as p25. Also when choosing digital as audio type, it comes in. Really thought it used to work differently.

buddrousa said:
I have seen over the last year or so a rise in unlicensed digital radios due to the fact no one could hear them or find out who they were.

I would bet the FCC has the ability to decode anything.

buddrousa · Jun 26, 2016

Just getting them to do anything other than sell frequencies was not easy.

wbswetnam · Jun 26, 2016

dave3825 said:
I would bet the FCC has the ability to decode anything.

The FCC can decode anything? Maybe. The NSA? Absolutely, they have a backdoor to all forms of encryption, I am sure.

dave3825 · Jun 26, 2016

So when the scanner picked it up, it displayed it a 67.0 pl and there was digital noise. Sdrsharp with dsd was showing it as p25 phase 1 with a nac of 167 and decoded it properly. Checked the audio type to make sure, and its set to analog search. Kept the scanner going for a few with sdrsharp and dsd running independently, and there was a few more transmissions. Same end result. Digital p25 coming over a freq set for analog...

Voyager · Jun 27, 2016

PL 67.0 is a common false from the tail of P25 transmissions.

It should be decoded on the 436 if the audio is set to ALL.

dave3825 · Jun 28, 2016

I checked Sentinel and the actual settings on the freq stored in the scanner and they are definitely set for All. If I can find directions on how to roll back to the latest non dmr firmware, I might give it a try and see what happens.

UPMan · Jun 28, 2016

If the scanner cannot resolve the signal to a digital format within 400 mS, the audio path will open and you'll hear whatever the signal is rendered as analog audio. You can adjust the eval time from 0 mS to 1000 mS.

If you know the freq is always digital, set it to Digital.

Digital noise on analog conv

dave3825

* * * * * * * * * * * *

buddrousa

Member

dave3825

* * * * * * * * * * * *

buddrousa

Member

wbswetnam

Member

dave3825

* * * * * * * * * * * *

Voyager

Member

dave3825

* * * * * * * * * * * *

UPMan

In Memoriam

Similar threads