TRX-1: Encryption

[Watchman1]

My manual says the TRX 1 display will show " E " on the display when receiving encrypted transmissions . My local PD is supposedly using P25 but the display says DMR and it sounds like an encrypted signal. Is it an issue with the settings or a normal indication ? So far I have never seen the "E" icon show up.

 

[troymail]

Maybe somebody heard digital noise and declared it encrypted.

What specific frequency and location?

 

[KevinC]

Maybe somebody heard digital noise and declared it encrypted.

What specific frequency and location?

My guess is Waynesboro, Tn...

https://www.radioreference.com/apps/db/?ctid=2518

And a lot of stuff shows to be DMR there.

 

[troymail]

Yup... lots of DMR on that page.... I'm trying to remember if DMR displays the E for encryption. I'm thinking that feature doesn't work correctly for TDMA (DMR and P25 Phase 2) but I could be wrong.

 

[Watchman1]

Yes...it sounds like it is encrypted......It is for Waynesboro PD. I get transmissions on 4 different frequencies.....453.1750, 453.3375, 453.3875, 453.5375. I can hear similar traffic in surrounding counties and they don't show up as encrypted either. Just wondered if anyone knew why it didn't show up.....Thanks.

 

[troymail]

Yes...it sounds like it is encrypted......It is for Waynesboro PD. I get transmissions on 4 different frequencies.....453.1750, 453.3375, 453.3875, 453.5375. I can hear similar traffic in surrounding counties and they don't show up as encrypted either. Just wondered if anyone knew why it didn't show up.....Thanks.

Yup - all listed as DMR in the database.

I'm pretty sure neither Whistler or Uniden properly detect encryption on TDMA (two-slot) signals (P25 Phase 2 and DMR). Both also allow these signals to pass through as "noise" on your scanner.

That is in contrast to P25 conventional and P25 Phase 1 -- Whistler will detect it, display the "E", and give you options of what you hear when detected. Uniden usually suppresses these and tries to make it non-existent (with no user configurable options).

 

[Ed6698]

My WS1095 appears to detect encrypted signals and does not allow them to pass through. it shows the E, this is on a 700mhz P25 Phase II system.

 

[troymail]

My WS1095 appears to detect encrypted signals and does not allow them to pass through. it shows the E, this is on a 700mhz P25 Phase II system.

...but is the talkgroup Phase 2?

Actually, more specifically, when you see the E, is the talkgroup in Phase 2 or Phase 1?

 

[Ed6698]

...but is the talkgroup Phase 2?

Actually, more specifically, when you see the E, is the talkgroup in Phase 2 or Phase 1?

The system only uses Phase II I believe.

Lake County Public Safety Trunking System, Countywide, Indiana - Scanner Frequencies

 

[troymail]

The system only uses Phase II I believe.

Lake County Public Safety Trunking System, Countywide, Indiana - Scanner Frequencies

Ok - that is the system I thought you were talking about --

Some Phase 2 systems are really mostly Phase 1 - others are Phase 2 and some talkgroups can revert to Phase 1 (temporarily) when necessary.

Perhaps something has changed in the scanner firmware (I don't have any Phase 2 around me at this point). I'll have to look closely on my travels next week.

 

[Ed6698]

Ok - that is the system I thought you were talking about --

Some Phase 2 systems are really mostly Phase 1 - others are Phase 2 and some talkgroups can revert to Phase 1 (temporarily) when necessary.

Perhaps something has changed in the scanner firmware (I don't have any Phase 2 around me at this point). I'll have to look closely on my travels next week.

I just press skip when a encrypted signal comes through, I have it set for busy signal. however I restore the skipped TGs every so often, I do that just in case a unencrypted signal comes through, which has happened a couple times.