Mute Encryption on astro 25 trunking conventional

[swiftnineteen]

I have a xts5000 model 1 that i bought to scan my local park police which is on a astro 25 trunk system from the county, i programmed all the channels from the trunking system minus the control channel and put it into 1 scan list and i can monitor them very good, my problem is when the court officers uses the radio they use encryption and i hear the encryption noise, can i set it to mute the encryption noise?

[d119]

No, you can't. It is what it is because you're scanning it conventionally.

[mike m]

This is very easy to set up, especially if your using one personality to build your voice channels that you are scanning.

Go into your personality screen for your channel that you are scanning and select the SECURE sub menu item and check PROPER CODE DETECT and go ahead and load in some key of your choice.

Since the key that you load in will not match the trunking system key that the system is using, you won't hear any secure noise on any encrypted channels, unless of course you are real lucky and you just happen to pick the exact key that the system is using but then I'd suggest going out and buying a lottery ticket.


Mike


OOPs a mistake

I didn't see that your system was digital, I know this works with securenet encryption.

I need to play around with a few radios digital mode to think this out and see if it will work.

I know I have a radio around here programmed to ignore the wrong key I just need to refresh myself.

[mike m]

OK this should work with P25 conventional scanning of an encrypted channel.

Go to the conventional channel that you are scanning and make sure it's set to digital then go to the SECURE menu item and select SECURE CLEAR STRAPPING and set it to CLEAR.

Now if your radio is not a secure model radio then I don't remember what will happen but If yours is a secure radio then this should mute the speaker just fine.



Mike

[MattSR]

This should be muted by default. Unless you're using something like Digital CSQ.

If you're using digital CSQ, disable that and enter the system ID as the NAC code and set it back to normal squelch. This will remove the encryption noise.

Cheers,
Matt

[swiftnineteen]

OK this should work with P25 conventional scanning of an encrypted channel.

Go to the conventional channel that you are scanning and make sure it's set to digital then go to the SECURE menu item and select SECURE CLEAR STRAPPING and set it to CLEAR.

Now if your radio is not a secure model radio then I don't remember what will happen but If yours is a secure radio then this should mute the speaker just fine.



Mike

i am scanning all voice channels from a p25 trunk system and the radio does hve secure and with your settings it still unmutes to encypted

[MattSR]

I'll ask again since you obviously missed my post.

Are you using digital CSQ?

[swiftnineteen]

yes

[MattSR]

Right. Thats your problem.

Digital CSQ will always unmute on ANY P25 signal.

Use the System ID for the trunk system you are monitoring, and input that as the NAC for the channel you are using. Then change the squelch type back to Normal instead of digial CSQ and the encrypted noise will be ignored.

Matt

[swiftnineteen]

whats if its not P25 can i use the 4 bits system id? or this will not work on non p25 systems

[MattSR]

From your first post:-

...scan my local park police which is on a astro 25 trunk system...

If its an ASTRO25 trunk system, then its P25 trunking, which means the NAC is the same as the system ID.

If its a 3600 baud system with ASTRO talkgroups (which it doesn't sound like from your description) then use the last two digits of the SysID and the connect tone table posted elsewhere (or in the trunker 3.8.3 source code) as the last digit of the NAC.

[swiftnineteen]

Personality is set to astro rx, astro tab is normal squelch for rx unmute rule, and when adding the channels to the zone I set the network I'd to the system I'd
I'm not hearing anything unless I set pl disable

[MattSR]

Is it P25 trunking or 3600 smartzone?

[swiftnineteen]

P25

[MattSR]

On every P25 trunk system I've ever encountered, the NAC is the same as the System ID...

[swiftnineteen]

Can I set the 7FE which is the code to rx all nac codes? And still have the encryption muted?
Has anyone ever successfully monitored a P25 / 9600 trunked system on a radio by entering all voice channels to its own scan list and still mute the encrypted traffic ?

[Spiffy50]

I use an XTS5000 UHF to monitor a local 9600 system in conventional mode. They have a few encrypted talkgroups. I've never had the radio stop on encrypted traffic, it seems to skip over it as though it isn't there at all. I have the channels programmed using the NAC as the same value as the Network ID, as has been suggested earlier. It works just fine for me, displays Radio IDs too!

[NSPD]

If you would follow the instructions in this thread, you would be in business by now.

[swiftnineteen]

Followed step-by-step and it won't work
If I set it to normal CSQ with the System ID as the Network ID I hear nothing
But if I set it to Digital CSQ then I hear everything including encryption

[MattSR]

You have the wrong system ID then.

[MattSR]

Use NAC of F7E then.

[swiftnineteen]

I will try F7E
Also how can I confirm the System ID I have is good? I know working radios in the field use that System ID so it muct be good

[akardam]

Although the Astro platform doesn't implement the F7E "digital CSQ" standard correctly, the Astro25 platform does, so there should be no difference between programming the channel as "digital CSQ" in the personality or putting a F7E RX NAC in the Zone Channel Assignment screen.

[MattSR]

Although the Astro platform doesn't implement the F7E "digital CSQ" standard correctly, the Astro25 platform does, so there should be no difference between programming the channel as "digital CSQ" in the personality or putting a F7E RX NAC in the Zone Channel Assignment screen.

Except that using F7E with the "Normal Squelch" option will respectfully mute encrypted audio (assuming theres no encryption key present that matches the KID and ALGID)

Digital CSQ ignores everything and unmutes to any P25 signal (encrypted or not)

Normal squelch will not unmute on encrypted rx.

[swiftnineteen]

i will try F7E with normal squ