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

[Jeff Kenyon]

Hi jerry, I don't know how 700 mHz will be organized, but M/Acomm just
came out with a radio that will do EDACS, OpenSky, and P-25 trunked and
conventional Phase I.  This radio will work in 700 and 800 MHz, so I don't
know what is happening.   Here in michigan it is still a ways out.





On Thu, 27 Oct 2005, JERRY NONE wrote:

> 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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