Question on Encryption Point(s) on Motorola TRS...

[b52hbuff]

I was doing some casual monitoring over at Travis AFB. They have a 400MHZ TRS that is pretty much all P25 audio, except for 1-2 patches. While monitoring the outputs with my BCD396, it was very obvious that the Security and Fire Departments had encrypted their TGIDs.

...I was casually monitoring some of the repeater inputs. I am not sure, but I think I may have observed that some Security/Fire transmissions were unencrypted. So is it possible for a digital TRS to receive an unencrypted signal via repeater inputs and then encrypt at the controller?

Now in the past, I had observed that a very few transmissions on these encrypted TGIDs did go out unencrypted. I assumed that someone forgot to select encryption on their radio.

So in this case, I wasn't sure if it was a case of misconfiguration or if it was possible that the repeater inputs were not always encrypted. I didn't have enough time to monitor to make an educated guess either way.

Thanks!

 

[WayneH]

So in this case, I wasn't sure if it was a case of misconfiguration or if it was possible that the repeater inputs were not always encrypted. I didn't have enough time to monitor to make an educated guess either way.

Encryption is dependent on the end-user. If you happened to listen to an input and heard clear voice then that person had their radio in the clear mode.

The system will never intervene and encrypt something.