Most Common PL/DPL

[lcsdguy]

i'm not sure if you people are real tech's or what but, what are the most common pl's and dpl's for public safety users? thanks

[the-mace]

This line breaks didn't come through right. Hope you can follow the lines both ways.

PL/CTCSS CODE BY FREQ
FREQ CODE | FREQ CODE
103.5 1A | 229.1 9Z
107.2 1B | 203.5 M1
100.0 1Z | 210.7 M2
114.8 2A | 218.1 M3
118.8 2B | 225.7 M4
110.9 2Z | 223.6 M5
127.3 3A | 241.8 M6
121.8 3B | 250.3 M7
123.0 3Z | 74.4 WA
141.3 4A | 79.7 WB
146.2 4B | 69.3 WZ
136.5 4Z | 71.9 XA
156.7 5A | 77.0 XB
162.2 5B | 67.0 XZ
151.4 5Z | 85.4 YA
173.8 6A | 88.5 YB
179.9 6B | 82.5 YZ
167.9 6Z | 94.8 ZA
192.8 7A | 97.4 ZB
186.2 7Z | 91.5 ZZ
206.5 8Z

[Microwavemike]

In answer to your question, 100 Hz, !Z is the most common PL used.
As to DPL I don’t have an answer to that.

mm

[N_Jay]

Originally Posted by Microwavemike

In answer to your question, 100 Hz, !Z is the most common PL used.
As to DPL I don’t have an answer to that.

mm

1A 103.5

At least that hasd been my experiance.

I used to use it on my GMRS systems because I could ALWAYS find reeds/filters for it. (Back in the day when thise things were expensive)

[RyltnVFD]

Well, in my area, most of the departments and agencies try to keep the same PL. They all work on different frequencies normally, so there is no interference.

However, if a situation arises in which multiple agencies (township/city PD, EMS) have to communicate with each other more quickly than with a TX, they can simply switch over to a common frequency (chosen as needed), without messing with the PL's.

Anyway, to answer your question, most of our agencies use 82.5, but there are two that use DPL, one is 261, the other is 054.

[EMS12]

Originally Posted by RyltnVFD

Well, in my area, most of the departments and agencies try to keep the same PL. They all work on different frequencies normally, so there is no interference.

However, if a situation arises in which multiple agencies (township/city PD, EMS) have to communicate with each other more quickly than with a TX, they can simply switch over to a common frequency (chosen as needed), without messing with the PL's.

Anyway, to answer your question, most of our agencies use 82.5, but there are two that use DPL, one is 261, the other is 054.

Interoperability is a big buzz word for a lot of agencies trying to keep all these different systems talking to each other.

Using a common PL or DPL is a great way to at least try to keep them all managed. But to try and pick a common or most popular is nearly impossible.

But I vote for 123.0

[MikeOxlong]

Best bet for interoperability is CSQ.

Around here, everybody uses something different but the common mutual aid channels are all CSQ (except for the ITAC channels).

[RyltnVFD]

Originally Posted by Mike_Oxlong

Best bet for interoperability is CSQ.

Around here, everybody uses something different but the common mutual aid channels are all CSQ (except for the ITAC channels).

Our county's fire channel is CSQ, and we seem to hear more traffic from Indiana and Wisconsin than from our own dispatch. they seem to forget that not everyone's radios have PL/DPL lockout.

[wa8pyr]

Originally Posted by lcsdguy

i'm not sure if you people are real tech's or what but, what are the most common pl's and dpl's for public safety users? thanks

There isn't really a "most common" PL or DPL, as such is usually set up locally. It's very common, however, for most agencies in a county (especially in suburban or rural areas) to use a common PL throughout the county. Up until the the late 70s or early 80s and the advent of programmable radios, radios were only capable of 1 tone, or maybe 2 or 4. So, everyone used the same PL so that interoperability was possible without having to use multiple radios.

The only real "common" PL I know of offhand is 156.7 Hz on the 800 MHz mutual aid frequencies.

Tom WA8PYR

[studgeman]

In my experience I have seen alot of 118.8 2B and 131.8 3B in traditional Motorola areas and 110.9 2Z in traditionally GE areas

[BirkenVogt]

I do notice that 156.7 seems to be common for itinerant sorts of frequencies. Also as stated 100.0, 103.5 and 123.0 but beyond that it is a mishmash.

Birken

[Hoofy]

In our area the common use for pl tones is to access different towers with the same frequencies that are situated in different parts of the county. I don't see a need for them when scanning except to identify the tower that is being used for that transmission. If you put a pl tone on a scanner frequency you will only hear the signals on that frequency that have that pl tone on its signal. Also pl got its name from the old Bell Telephone private line code. It is also subaudible or mostly outside human hearing. Hoofy

[BirkenVogt]

It is not outside human hearing at all but the radios are supposed to filter it out so it doesn't make it to the speaker. Also I have been told that Motorola invented it and coined the term "PL".

Birken

[Hoofy]

I stand corrected. Motorola did invent it and coined it pl for private line.
Hoofy

[greateratlanta]

What does CSQ stand for? I'm guessing something to do with squelch.

[pfish]

CSQ is carrier squelch. There is no PL/DPL tone -- just the voice!

[Caesar]

dcs 315
pl 156.7 and 173.8

in my area

[jparks29]

+1 for 156.7

PL=CTCSS

[rattlerbb01]

everything surrounding brazos county in southeast texas is 141.3. and everything around houston not including the city's uhf system (123,127.3) is 146.2. Most of deep east texas is 192.8.