[TrunkCom] Control Frequency Only Mode

Wed Oct 26 20:44:40 EDT 2005

Hi Jerry, As stated earlier in this thread Motorola has a channel
assignment all set up for their systems in the 800-900 MHz range, and then
base and offsets for the VHF/UHF trunking systems. With EDACS and LTR
systems the controler will just tell the radio to go to logical channel
number (LCN) 1 for a call and the LCNS for LTR and EDACS do not correspond
to any frequency, but rather is what the system programmer decides.  I am
not sure about MPT-1327 or TETRA, but Passport is another form of LTR
trunking as is Multi-net.  Multi-net is used for public safety users and
has other features such as priority cuing, and emergency calls, etc.  I'm
not sure about Passport, but a lot of public safety agencies are using
passport too.

On Wed, 26 Oct 2005, JERRY NONE wrote:

> You well aren't the LCN channels?
> As in Logic Channels?
> I am a little confused here.
> MOTO has a band plan channel and EDACS and LTR have
> Logic Channels?  What is the difference?
> Do Passport, Multi-Net, ESAS, & MPT have Channels too?
> What about Tetra?
>
> --- Jeff Kenyon <at649 at tcnet.org> wrote:
>
> > We need LCN's for EDACS and LTR because they are
> > different trunking
> > formats.  EDACS and LTR radios, by contrast have all
> > the LCNS programmed
> > in the same order as you would program them into
> > your scanner.
> >
> >
> >
> >
> >
> > On Wed, 26 Oct 2005, JERRY NONE wrote:
> >
> > > So then why don't we need the L.C.N.s or Channel
> > > Numbers for Motorola but we need them for EDACS
> > and
> > > LTR?
> > >
> > > --- bearcat <rwnewbould at comcast.net> wrote:
> > >
> > > > Each 800/900 mhz freq has been aasigned a
> > channel
> > > > no.  The control
> > > > channel data from the system tells the units
> > which
> > > > channel no. (hence
> > > > freq) to go to.  The scanner gets the
> > information
> > > > from the system
> > > > control channel so they can add as many new
> > sites as
> > > > they need and the
> > > > data will then be on the system control channel
> > so
> > > > the scanner handles
> > > > if just fine.  This is why rebanding is such and
> > > > issue the channel no.s
> > > > being sent will make no sense to the scanner.
> > The
> > > > advantage to using CC
> > > > only programming is that if something would
> > change
> > > > on the system the
> > > > scanner user will never miss a beat.  If you
> > have
> > > > all of the freqs
> > > > programmed in a a new site is added you will not
> > > > hear it.
> > > >
> > > > This is explained to the best of my limited tech
> > > > knowledge
> > > >
> > > > Rich
> > > >
> > > > -----Original Message-----
> > > > From: trunkcom-bounces at mailman.qth.net
> > > > [mailto:trunkcom-bounces at mailman.qth.net] On
> > Behalf
> > > > Of JERRY NONE
> > > > Sent: Monday, October 24, 2005 10:58 AM
> > > > To: Discussion of Monitoring Trunk Radio Systems
> > > > Subject: Re: [TrunkCom] Control Frequency Only
> > Mode
> > > >
> > > >
> > > > Does anybody have a copy of this band plan?
> > > >
> > > > --- Jeff Kenyon <at649 at tcnet.org> wrote:
> > > >
> > > > > Hi Jerry, a scanner that doesn't support
> > control
> > > > > only mode will have the
> > > > > frequencies as reference to go to for a
> > > > > transmission.  In control channel
> > > > > only mode, the scanner follows the specific
> > band
> > > > > plan that Motorola has
> > > > > set up for its various bands such as 800 and
> > 900
> > > > MHz
> > > > > trunking so that is
> > > > > how this is all possible, and with control
> > only
> > > > mode
> > > > > you can hear all the
> > > > > transmission, and any subsequent transmission.
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > On Mon, 24 Oct 2005, JERRY NONE wrote:
> > > > >
> > > > > > Question.  Okay, say for instance you have a
> > > > radio
> > > > > > scanner that does NOT do Control Frequency
> > Only
> > > > > Mode.
> > > > > > So you program in all the frequencies.  So
> > when
> > > > > the
> > > > > > Controller tells Talk group 336 to go to a
> > > > > frequency
> > > > > > of 868.7125, how does a radio scanner in
> > Control
> > > > > > Frequency Only Mode know NOT to go that
> > > > frequency.
> > > > > > Instead the message is heard on one of the
> > > > Control Frequencies.
> > > > > > Also by being in Control Only Mode,
> > > > > does
> > > > > > this prevent the radio scanner from hearing
> > all
> > > > > the
> > > > > > transmissions?  I mean if the system you are
> > > > > > monitoring has seven frequencies and then
> > adds
> > > > > three
> > > > > > more frequencies to accomodate extra users
> > but
> > > > the
> > > > > > Control Frequencies remain @ the same
> > amount,
> > > > > won't
> > > > > > that cut off some transmissions?  What
> > happens
> > > > > then,
> > > > > > do you just hear the priority transmisions?
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> ========================================================================
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> > > > > >
> > > > >
> > > >
> > >
> >
> ------------------------------------------------------------------------
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> >
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> > > > >
> > > >
> > >
> >
> ------------------------------------------------------------------------
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> === message truncated ===
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