[TrunkCom] Control Frequency Only Mode

Wed Oct 26 21:00:10 EDT 2005

For Motorola systems Motorola made this decision, and other vendors I.E.
M/Acomm and E.F. Johnson designed their own trunking programs.

On Wed, 26 Oct 2005, JERRY NONE wrote:

> Thanks Jeff.
> Sorryu about that but I didn't think that anybody
> woul;d of responded this fast.  I was going to say
> "DISREGARD" after I read one of the messages but ops,
> to late.
> Hey thanks again for the info.
> I also understand that Pure P-25 starts off @ 1
> instead of 16.  Does that mean that it goes
> 1,2,3,4,5,6...instead of 16,32,48,60,...
> Did MOT odecide this or was this an industry or FCC
> standard?
>
> --- Jeff Kenyon <at649 at tcnet.org> wrote:
>
> > 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?
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> ========================================================================
> > > > > > > > County Of Medina Ohio County Scanner
> > Group:
> >
> === message truncated ===
>
>
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