[TrunkCom] Control Frequency Only Mode

[Jeff Kenyon]

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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