[TrunkCom] Control Frequency Only Mode, 700 Megacycles, MOTO, EDACS, LTR

[JERRY NONE]

Well that answers the questions about rebanding.

Thanks Tom.

Well what about the new 700 band.  Will these channels
be predefinded?  Or will this be more like EDACS and
LTR?  Will this be strictly MOTO or will there be
EDACS and LTR in this band too?

Are we looking @ the end of LTR?  Will everything go
to LTR Multi-Net, LTR Passport, and/or LTR ESAS?

What about the 380 - 400 band?

--- Tom Swisher <wa8pyr-scan at sbcglobal.net> wrote:

> 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?
> 
> Motorola systems assign 800 and 900 MHz frequencies
> based on the channel 
> number assigned each frequency by the FCC. EDACS and
> LTR channel numbers 
> are assigned in the system itself: 1, 2, 3, 4 and so
> on.
> 
> When a Motorola controller makes a channel
> assignment, it tells the 
> radio "go to channel 607". The radio has a table of
> frequencies in it's 
> firmware and knows from that what frequency to use.
> Thus, Motorola 
> radios only need the control channel frequencies for
> a system, so that 
> they know where to listen for control data. The same
> is true for more 
> recent scanners, which have the same channel table
> in their firmware.
> 
> Channel numbers for EDACS and LTR, on the other
> hand, are defined on a 
> system-by-system basis. It's entirely up to how the
> person who set the 
> system up was feeling that day; this is why the
> Logical Channel Number 
> arrangement in some systems goes up in ascending
> order by frequency, 
> while others jump all over the place.
> 
> Thus, EDACS and LTR controllers tell radios "go to
> channel 3", and the 
> radio goes to channel 3, the frequency for which was
> defined in the 
> radio itself when it was programmed. EDACS and LTR
> radios therefore do 
> not have a pre-defined table of frequencies in them,
> just what has been 
> defined for the system itself.
> 
> And this is where the problem lies with rebanding
> for Motorola and 
> scanners; the frequencies between 851 and 854 MHz
> are currently 
> channelized at 25kHz steps, for a total of 120
> channels. With rebanding, 
> that segment of the band is being rechanneled at
> 12.5kHz steps, which 
> will give 240 channels. However, rechanneling means
> the channel numbers 
> will change, and some older Motorola radios (and
> scanners) are not 
> capable of having their firmware upgraded for the
> new channel tables and 
> thus won't work if a system is rebanded to 851-854
> MHz. EDACS and LTR 
> systems won't have this problem since they are
> manually defined.
> 
> However, a likely workaround for some older scanners
> will be to simply 
> define a custom channel table for the 851-854 band,
> using 851.0125 as a 
> base and 12.5kHz as an offset.
> 
> Tom WA8PYR
> --
>
-----------------------------------------------------
> Tom Swisher, WA8PYR        
> wa8pyr-scan at sbcglobal.net
>   "Restriction of free thought and free speech is
> the
>     most dangerous of all subversions. It is the one
>    un-American act that could most easily defeat
> us."
>           Justice William O. Douglas, 1953
>         WA8PYR Radio - http://www.wa8pyr.net
> 
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========================================================================
Southwestern Cuyahoga County Ohio, Parma Ohio & Strongsville Ohio Radio Scanner Group:
http://groups.yahoo.com/group/Southwest_Parma_Strongsville/
------------------------------------------------------------------------
County Of Medina Ohio County Scanner Group:  
http://groups.yahoo.com/group/medinascanner/
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