[TrunkCom] Control Frequency Only Mode

[Jeff Kenyon]

You don't need an offset and base for EDACS and LTR, because you have the
LCNS, and like I said in my last message they don't correspond to any
specific frequency as do Motorola systems.





On Wed, 26 Oct 2005, JERRY NONE wrote:

> Oh great.  Another question, "Why is that?"
> Also does Bearcat's explanation explain why you do NOT
> need a Offest and Base Frequency on VHF/UHF for EDACS
> and LTR?
>
> --- Jeff Kenyon <at649 at tcnet.org> wrote:
>
> > With Motorola systems the channel assignments apply
> > to 800 and 900 MHz,
> > and VHF/UHF systems need the tables to be set
> > accordingly.
> >
> >
> >
> >
> >
> > On Wed, 26 Oct 2005, bearcat wrote:
> >
> > > The channel no. on Motorola are calculated in the
> > control channel data
> > > based on the base freq of the system. I guess the
> > best way to explain
> > > it.....
> > >
> > > The Mot system determines the freq based on a base
> > freq and the channel
> > > no. assigned to the freq.  The freqs are assigned
> > a designated ch # like
> > > 381 relates to a specific freq.  So the freq and
> > Ch # are always the
> > > same Ch 381 in Ohio is ch 381 in California.  It
> > is a predetermined
> > > system used on all Motorola systems, excluding the
> > new P25 systems.
> > > Remember P25 is an industry standard it is not
> > Motorola
> > >
> > > The LTR and EDACS control channel data just says
> > go to ch 1 or 13 or 9
> > > it does not really care what freq would be there
> > it just goes to the
> > > Logical Channel No. not freq. LCNs # can contain
> > any freq that is put
> > > there, there is not CH# to Freq relationship  If
> > you changed the freq
> > > for LCN#1 on an edacs repeater the control channel
> > would still go to LCN
> > > #1 because it does not handle any freq data.  LTR
> > do not have a single
> > > control channel, they have the LCN data on all
> > freqs in the system, but
> > > once again they are not related at all to freq.
> > >
> > > The new EFJohnson IP25 system is a mix it uses a
> > single control channel
> > > but directs units to a freq through ch. No. which
> > are defined Just for
> > > that system
> > >
> > > Example
> > > System A          System B
> > > CH1 856.2125	CH1 856.4125
> > > CH2 857.2125	CH2 857.4125
> > >
> > > This is why you can have Control Channel only
> > programming on your
> > > scanner for Motorola and not LTR or EDACS.
> > >
> > > You get the idea
> > >
> > > Hopefully someone with a better techical knowledge
> > of the system will
> > > respond.  The concept of the email is correct I
> > just do not maybe know
> > > all of the tech jargon
> > >
> > > Rich
> > >
> > >
> > >
> > > 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?
> > >
> > >
> > >
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