I agree, the GM300 has channel steering. I looked in the manual,
and I was wrong about the number of channels.
Five bits on the accessory connector are programmable, the first
four let you select channels 1-16 using straight binary values of
0-15, however if you make bit 5 active then the first 4 are ignored
and you go to channel 32.
You'd think that if bit three was on (giving the decimal value of 8)
and you flipped bit 5 that you'd get channel 24 (i.e. 16+8), but no....
we can't make it that easy and have straight 5-bit binary and have
all 32 channels in the radio selectable... If you flip bit five, you
go to channel 32. Period.
So where I said:
% If I remember correctly when the high order bit goes on
% the radio ignores the other three. So you get 0-7 plus 1.
I should have said the radio ignores the other four. So you
get 17 logic states using binary 0-15 plus one more.
Mike WA6ILQ
At 05:13 PM 05/24/07, you wrote:
Rethink your binaries:
0-7 minus 1
You get 1 through 7 remote control with 3 binaries to control.
We do it on about 6 GM and CDM radios.
CBS Bill
W6CBS
Subject: Re: [Repeater-Builder] Re: Remote Base/Repeater Question
From a Newbie
Yeah, but look at the mapping.
You don't get 16 selections.
If I remember correctly when the high order bit goes on
the radio ignores the other three. So you get 0-7 plus 1.
Mike
At 01:47 PM 05/24/07, you wrote:
>Four bits (pins) are abailable, I think.
>
>Joe M.
>
>Mike Morris WA6ILQ wrote:
> >
> > Look for a GM300 as opposed to a Maxtrac. The GMs have
> > a "channel steering" option that can be enabled in the RSS
> > and by grounding selected pins in the 16-pin jack on the
> > back you can binary select 8 or 9 (I think) channels... using
> > three or four bits in a binary pattern.
> >
> > The 7K lets you output a 6-bit binary number to 6 pins on the
> > 7K connector, the manual shows 5 on a TS32, the web page at
> >
<<http://www.scomcontrollers.com/tips/7k_ts64_motorola2.html>http://www.scomcontrollers.com/tips/7k_ts64_motorola2.html>
> > shows how I set up a TS64 (uses 6 bits), you could set up a
> > crossband repeater with the PL board in it locked to one tone
> > (or DPL code), and use touchtone commands on the 7K to
> > "steer" the 2m GM300 to the channel you wanted to talk on.
> > Chapter 10 in the 7K manual has all the details on the (PW)03xx
> > command.
> >
> > So take a UHF Maxtrac or GM300 and a high band GM300 and get
> > a few connector parts from DigiKey...
> >
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