TPL vs DPL

[WRWM850]

what is the difference between dpl and tpl?

I've set tpl to talk to local repeaters but I'm not familiar with dpl

as I was programming my radio I had 3 option TPL, DPL and CSQ

[wayoverthere]

This page seems to have a pretty good description of the mechanics of each, analog (tone, ctcss) vs digital (code/dcs) https://www.twowayradiocommunity.com/differences-ctcss-dcs/

PL (or in this case, TPL) is ctcss, while DPL is DCS; either on the receive settings for your radio acts as a filter, only opening squelch for signals with a matching tone/code.

CSQ is carrier squelch, and means squelch opens for any signal above a preset threshold (the squelch level setting).

[gortex2]

DPL is the same as DCS. Motorola used the term DPL. 

[nokones]

2 hours ago, gortex2 said:

DPL is the same as DCS. Motorola used the term DPL. 

And, I do too.

[KAF6045]

3 hours ago, gortex2 said:

DPL is the same as DCS. Motorola used the term DPL. 

The misleading term [D]PL with PL short for "Private Line", when there is nothing private about it. The use of tones does not make one's transmissions "private", it only allows one to filter out others -- they can still hear one's transmissions all they want.

You'd need to enable encryption in radios equipped with that feature to get privacy. Of course, encryption is against the regulations of practically all services except some Part 90 LMR (law enforcement, mostly).

 

[WRWM850]

I set the DPL on a couple handhelds: I set 3 different dpl tones all to gmrs channel 16

what I found was the radios I had set to CSQ could receive the different DPL variations  it just talk to the DPL programed radio 

so it seems like the DPL tone just makes you radio picky on what it will listen to? doesn't seem very private just a way to filter out other radio users

 

unless I'm getting this wrong.

[SteveShannon]

2 minutes ago, WRWM850 said:

I set the DPL on a couple handhelds: I set 3 different dpl tones all to gmrs channel 16

what I found was the radios I had set to CSQ could receive the different DPL variations  it just talk to the DPL programed radio 

so it seems like the DPL tone just makes you radio picky on what it will listen to? doesn't seem very private just a way to filter out other radio users

 

unless I'm getting this wrong.

That’s correct. All “privacy tones” do is filter out anything else to reduce interruptions. They do not make your conversations private.

[Bmadda]

Doesn't anybody remember the movie Dr. Strangelove?  A Stanley Kubrick classic.  Watch that movie and "privacy codes" will make sense.  to quote George C. Scott's line on the subject..."Sir under condition RED the normal SSB radios on board the aircraft are switched in to a special coded device...which I believe is designated CRM-114.  In order to prevent the enemy from issuing fake or misleading orders, the CRM-114 is designed not to receive at all...unless the transmission is preceded by the correct three letter code group prefix"...that's pretty much what PL's do...regardless if digital or analog. 

[axorlov]

You are going to answer to Motorola Coca Cola company!

[WRWM850]

2 hours ago, Bmadda said:

Doesn't anybody remember the movie Dr. Strangelove?  A Stanley Kubrick classic.  Watch that movie and "privacy codes" will make sense.  to quote George C. Scott's line on the subject..."Sir under condition RED the normal SSB radios on board the aircraft are switched in to a special coded device...which I believe is designated CRM-114.  In order to prevent the enemy from issuing fake or misleading orders, the CRM-114 is designed not to receive at all...unless the transmission is preceded by the correct three letter code group prefix"...that's pretty much what PL's do...regardless if digital or analog. 

 

2 hours ago, Bmadda said:

Doesn't anybody remember the movie Dr. Strangelove?  A Stanley Kubrick classic.  Watch that movie and "privacy codes" will make sense.  to quote George C. Scott's line on the subject..."Sir under condition RED the normal SSB radios on board the aircraft are switched in to a special coded device...which I believe is designated CRM-114.  In order to prevent the enemy from issuing fake or misleading orders, the CRM-114 is designed not to receive at all...unless the transmission is preceded by the correct three letter code group prefix"...that's pretty much what PL's do...regardless if digital or analog. 

I haven't seen that one in a long time, great comparison 

[WRWM850]

19 hours ago, wayoverthere said:

This page seems to have a pretty good description of the mechanics of each, analog (tone, ctcss) vs digital (code/dcs) https://www.twowayradiocommunity.com/differences-ctcss-dcs/

PL (or in this case, TPL) is ctcss, while DPL is DCS; either on the receive settings for your radio acts as a filter, only opening squelch for signals with a matching tone/code.

CSQ is carrier squelch, and means squelch opens for any signal above a preset threshold (the squelch level setting).

yeah that is a good description thanks for the link

[gortex2]

18 hours ago, KAF6045 said:

Of course, encryption is against the regulations of practically all services except some Part 90 LMR (law enforcement, mostly).

Not accurate at all. Yes GMRS and Amatuer Radio cannot use encryption but there is no laws on business LMR nor public safety on who can or cannot use encryption. All our work radios are encrypted as are some of our SAR stuff (both simplex and TLMR). You will also see alot of encryption on military and federal comms.