[TrunkCom] DPL On A TRS???

Mon, 20 Oct 2003 22:00:44 -0400

Kel,

I don't know if this is possible or not, but it makes no sense at all when
you think about it... at least to me.  While some use PL/DPL as a form of
"signalling", I've always thought its main purpose was to allow the sharing
of frequencies by multiple licenses without disturbing one another.  In a
trunked system, you can create a talkgroup, and will not have to worry about
sharing.

Just my .02
Dewey

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of WA3YSU
Sent: Monday, October 20, 2003 21:46
To: [email protected]
Subject: [TrunkCom] DPL On A TRS???

Can a trunk system can transmit a DPL on the transmitted signal?

The reason I am asking is that with the recent changes on the New Jersey
State Police trunk system, I  am now seeing a consistent DPL of 365 on all
Southstar Medevac transmissions (TG 26800) and I am also now seeing a DPL of
315 on the Hospital Net (TG 28304).

Prior to the recent changes I had never seen any PL/DPL's on the
NJ trunk system, and I am not seeing it on any other TGs at this time.

I had always thought that trunk systems relied on sub-tones for  control
functions which would rule out PL/DPL usage.

Thanks! - Kel

(Added Comment: It just so happens that I have a CSI tone decoder on my
BC-780 that I use to track the NJSP system and all of a sudden last week I
started to notice that it was decoding a DPL tone on the Medevacs and the
Hospital Net.  At first I thought it was just a fluke, but I watched and see
it happens every time and only on those talkgroups, regardless of what
actual frequency the TG was assigned to. )

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