• 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

Encryption Question

Status
Not open for further replies.
Joined
Nov 5, 2006
Messages
635
Location
Phoenix Arizona
#1
Why is it that certain agencies have encryption on their radios, yet rarely use it?

Besides the human reasons (forgot to turn it on), ignorance, etc.

What TECHNICAL reasons are there for not being able to use encryption at times (other than one or more involved doesn't have encryption capability).

I remember years ago when PPD was analog uhf for surveillance, they would sometimes say "I am out of range for B" which meant they couldn't use encryption, but why would that be? If the radio works, why wouldn't the encryption work?
 
Joined
May 16, 2008
Messages
45
#2
The repeater can not pass encryption (The radios are new or not designed to work with that repeater system in encryption mode IE: new radios older repeater, Brand conflict, Etc.) So they may be able to use two radios (mobile or portable) while using encryption but must be in simplex or direct mode.

Some departments only chose to use it for sensitive information or for surveillance.

Some departments do not allow it to be used for incident related communications because its off the repeater (that can not pass it) and have no way to record it .
 
Joined
May 16, 2008
Messages
45
#4
Because range is reduced in digital encrypted modes and digital in general. Motorola DES and DVP really reduces range and APCO25 is better, but not as robust as analog FM.
prcguy
That is if they are operating in simplex or direct mode. That would have no effect if they were operating on a repeater which passes digital and their form of encryption. I'm not really sure if the "P25" IMBE vocoder offers any real advantage for distance. I have issues with it when just a few buildings are in the way. I don't have any real proof of this but IMBE was not chosen because of the clarity over distance. You have much better results operating in analog encrypted and that is how most of the time at least in my experience departments programing their "digital" radios to operate in simplex or direct using encryption and analog voice. But that really goes WAY beyond the orig. question... If I come across any a document that backs my statements up ill post it but I speak from personal experience operating in and programing both modes and feedback from those that operate them.
 
Last edited:
Status
Not open for further replies.
Top