PL/DPL codes
- Thread starter frogmn78
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Welcome to the forums.
See here for PL and here for DPL.
What happens if you don't set them is you don't apply any filter to the signals received.
texasemt13
CenTex DBA
Simply put:
It is a way for the same freq to be shared. Imagine an area where one frequency is shared (let's say 123.4560MHz- if there was such a step).
"Police Dept. A" uses this freq. as well as "Fire Dept. Q" in another neighboring town. By applying a PL tone it allows the user radios to only focus on that freq (123.4560) with that PL tone (say 203.5- in Hz). So Fire Dept. B would have to have another PL tone (a different one)- say 136.5.
As long as the users have the PL tone in they will only hear their dept. Once they don't (or if your scanner doesn't) you will not be able to differentiate between the two (without a little investigative work).
It is a way for the same freq to be shared. Imagine an area where one frequency is shared (let's say 123.4560MHz- if there was such a step).
"Police Dept. A" uses this freq. as well as "Fire Dept. Q" in another neighboring town. By applying a PL tone it allows the user radios to only focus on that freq (123.4560) with that PL tone (say 203.5- in Hz). So Fire Dept. B would have to have another PL tone (a different one)- say 136.5.
As long as the users have the PL tone in they will only hear their dept. Once they don't (or if your scanner doesn't) you will not be able to differentiate between the two (without a little investigative work).
If someone is listening with a tone/code filter on, then the transmitter must also put out the tone/code or else the receiver's squelch will not open; hence, the name tone or digital squelch. Someone listening with no tone/code set on the receiver will hear everything.
You have to have the "code" to talk to someone on a "coded frequency".
No. The Pro-95 does not have any tone capability.
PL/DPL tones are subaudible tones, used to gain access to a repeater. Most repeater systems do not pass that tone through the repeater. Even if the tone is being passed through the repeater, it isn't necessary to decode that tone in order for you to be able to listen. The advantage in using a tone squelch (decode) feature, is that you will only hear transmissions from the repeater that is passing that tone. If you turn the tone squelch feature on, and the repeater isn't passing the tone, you will not hear anything that is being said over that repeater. The easiest way to find out if a repeater is passing a tone is to use the tone search feature that some scanners come with. I rarely use the tone squelch feature, because there aren't very many interference issues in this area.
dwh367
Amateur Radio Operator
PL/DPL isn't restricted to repeater use only. It is also used for simplex communications.
CT/DC not PL/DPL
The GENERIC terms for these functions are CTCSS (or CT for short) and DCS (or DC for short). CTCSS = Continuous Tone Coded Squelc System. DCS = Digital Coded Squelch.
Actually, PL and DPL are trademarked terms. PL = Private Line and DPL = Digital Private Line, both by Motorola.
The GENERIC terms for these functions are CTCSS (or CT for short) and DCS (or DC for short). CTCSS = Continuous Tone Coded Squelc System. DCS = Digital Coded Squelch.
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