PSR-500 Conventional Encryption

[sfd119]

I have a PSR-500 desk queen that I use at work. I don't get pager reception in my building, so I have that scanning the county.

County SO uses Encryption from time to time and it comes across garbled. In searching, I haven't found anything about Conventional Encryption.

Can I mute the encryption garbled sounds on a conventional channel using this old scanner?

Thanks.

 

[usswood]

No, because you would have to lock out a Frequency which would carry non encrypted voice also!

 

[gmclam]

What you could do is use the "temporary lock out" feature. It will lock out the TG/channel now, but it will be unlocked out after you power cycle.

 

[sfd119]

Yeah, I don't want Lockout or anything. Sometimes its only one-sided encryption. Just looking to mute it like some of the Unidens.

Thanks anyway.

 

[teufler]

its worked here, if the station you are monitoring uses tones, ctcss, when they go encypted, the tone changes, not on the tone selected, or because of encryption the tone is not readable hence the radio does not decode and the audio is passed by. now if only one side is encryption,, while bypassing the frequency, misses the other "reply" because of scanning other frequencies. The scanner may take many seconds to come back to the frequency you were monitoring. So if tone is selected, the radio "mutes" while the signal is "encrypted". This does not work for digital encryption. The radio develops a quick chirp, ther frequency is displayed but it stays silent.

 

[N8IAA]

I have a PSR-500 desk queen that I use at work. I don't get pager reception in my building, so I have that scanning the county.

County SO uses Encryption from time to time and it comes across garbled. In searching, I haven't found anything about Conventional Encryption.

Can I mute the encryption garbled sounds on a conventional channel using this old scanner?

Thanks.

On my 197, if I'm monitoring Fed freqs, and encryption shows its ugly noise, just push LOUT. It will temporally lock out the frequency.
Otherwise, I have a PSR-800 that will mute the encrypted side and let the in the clear be heard. My 396XT and HP1 will do the same.
Larry

 

[sfd119]

its worked here, if the station you are monitoring uses tones, ctcss, when they go encypted, the tone changes, not on the tone selected, or because of encryption the tone is not readable hence the radio does not decode and the audio is passed by. now if only one side is encryption,, while bypassing the frequency, misses the other "reply" because of scanning other frequencies. The scanner may take many seconds to come back to the frequency you were monitoring. So if tone is selected, the radio "mutes" while the signal is "encrypted". This does not work for digital encryption. The radio develops a quick chirp, ther frequency is displayed but it stays silent.

This is Digital, Conventional encryption. It does not stay silent.

On my 197, if I'm monitoring Fed freqs, and encryption shows its ugly noise, just push LOUT. It will temporally lock out the frequency.
Otherwise, I have a PSR-800 that will mute the encrypted side and let the in the clear be heard. My 396XT and HP1 will do the same.
Larry

I do not have either of those scanners. I do not want to use the Lock Out function. I want to mute the encrypted part of the conversation and return back to the unencrypted comms.

Thanks for all who responded, it does not appear this scanner can do this.

 

[DaveNF2G]

Usually, CTCSS and/or DCS are turned off for encrypted transmissions because they can become part of the data being scrambled. I'm surprised anyone is sending encryption over tone squelch.

Also, if you're talking about Schenectady PD, what you are hearing might not be encryption. They have the ability to use their radios in P25 mode on the regular analog channels. However, that should not be coming over tone squelch, either.

 

[sfd119]

Usually, CTCSS and/or DCS are turned off for encrypted transmissions because they can become part of the data being scrambled. I'm surprised anyone is sending encryption over tone squelch.

I believe digital encryption still caries a NAC. This is not analog encryption.

Also, if you're talking about Schenectady PD, what you are hearing might not be encryption. They have the ability to use their radios in P25 mode on the regular analog channels. However, that should not be coming over tone squelch, either.

That's....impossible. You either do P25 or you do Analog, your radio can't do both simultaneously. They might have a Mixed mode repeater where one unit can talk analog and the other can respond on Digital (P25) and everyone can hear. Much like this county.

 

[gmclam]

CT DC NAC tones

There are channels out there where one radio might be in the clear while others are encrypted. I've also seen frequencies where one dispatch center is using analog and another P25.

What I've done is always program a tone. For analog, select CT or DC and enter the tone. The squelch will not open if the tone is not present.

For digital, I'll program the same frequency again if it is also used for analog, and now program an NAC tone. What I don't know for sure is if the NAC tone is sent/received/decoded if the transmission is encrypted. If the entire transmission is encrypted, the NAC being part of it, then the squelch won't open unless the signal is in the clear.

 

[DaveNF2G]

I did not say they were doing analog and P25 at the same time. I said they could (and do) use both. The dispatcher does not hear the digital traffic.