• Effective immediately we will be deleting, without notice, any negative threads or posts that deal with the use of encryption and streaming of scanner audio.

    We've noticed a huge increase in rants and negative posts that revolve around agencies going to encryption due to the broadcasting of scanner audio on the internet. It's now worn out and continues to be the same recycled rants. These rants hijack the threads and derail the conversation. They no longer have a place anywhere on this forum other than in the designated threads in the Rants forum in the Tavern.

    If you violate these guidelines your post will be deleted without notice and an infraction will be issued. We are not against discussion of this issue. You just need to do it in the right place. For example:
    https://forums.radioreference.com/rants/224104-official-thread-live-audio-feeds-scanners-wait-encryption.html

ENC displayed when no encryption -- decoding error?

Status
Not open for further replies.

wolter

Member
Joined
Dec 19, 2002
Messages
283
I have seen ENC display in a 396 several times on a P25 channel that I know does not use encryption. It will display for a split second, then disappear during a transmission. Is this a decoding error by the 396?
 

sgfitzs

Member
Joined
Feb 23, 2006
Messages
32
I've seen the same thing while listening to the Maryland state police. If the P25 signal is weak, ENC wil display briefly and the audio will be poor. As soon as the signal strength increases a bit, the ENC disappears and the audio clears up.
 

wolter

Member
Joined
Dec 19, 2002
Messages
283
DaveIN said:
Is this on a 9600 baud P25 system or 3600 baud mixed mode system?
I've seen this with 3600 and conventional systems.

sgfitzs said:
If the P25 signal is weak, ENC wil display briefly and the audio will be poor.
How weak is too weak? I've seen this with 3 and 4 bars; I've never bothered to look when receiving 5 bars.
 

SCPD

Member
Joined
Feb 24, 2001
Messages
65,126
Location
Virginia
I see it all the time usually at the start of the transmission. Does not seem to have any impact on the tx though. Don't know if this is design or error though.
 

DaveIN

Founders Curmudgen
Database Admin
Joined
Jan 5, 2003
Messages
6,508
Location
West Michigan
I'm thinking it may bethat the 996 sees "some" link data as encrypted for the 3600 baud system, but the conventional I don't know, as I've not used it on conventional P25.
 

jparks29

Member
Joined
Nov 20, 2003
Messages
804
Location
Melmac
sgfitzs said:
I've seen the same thing while listening to the Maryland state police. If the P25 signal is weak, ENC wil display briefly and the audio will be poor. As soon as the signal strength increases a bit, the ENC disappears and the audio clears up.

where is Maryland State Police using P25??? Other than a patch on a county system?
 

wolter

Member
Joined
Dec 19, 2002
Messages
283
wheelchair said:
Does not seem to have any impact on the tx though.
I've noticed it muting the audio, as its designed to do with encrypted traffic; the beginning of the transmission is chopped off. But this isn't encrypted traffic, so it is annoying even though it is just for a short moment.

DaveIN said:
I'm thinking it may bethat the 996 sees "some" link data as encrypted.
I'm seeing it on the 396. If you're seeing it on the 996 too, it may be a Uniden thing. I'd be curious to know if GRE/Rat Shack people report decoding errors also.
 
Last edited:

SCPD

Member
Joined
Feb 24, 2001
Messages
65,126
Location
Virginia
Took another look at the users manual. It says:
ENC- appears when APCO P25 encrypted data is being received on a voice channel.

After paying closer attention today, this would seem to be the case on the system I'm monitoring. There's a short burst of -- for lack of a better term-- static before the beginning of the transmission. I'm not finding that this is causing anything to get chopped. It is a brief burst of 1/2 sec or less. So it would seem to be design. Doesn't seem to matter on mine what the signal is...2 bar or 5 bar same thing happens.
This experience is with Ontario's Fleetnet system monitoring the OPP.
 

poltergeisty

Truth is a force of nature
Joined
May 7, 2004
Messages
3,827
Location
RLG, Fly heading 053, intercept 315 DVV
I forget what they call that with the burst of digital before the radio TX, but it's common with the radio systems in digital format. I hear that only when I am searching the 800 MHz band and someone comes on, but not when the talk groups programed.

It could very well be that because it carrys no voice.
 
Status
Not open for further replies.
Top