[Motorola] CDM750 accessory connector/ RX audio

Mon, 11 Nov 2002 08:45:37 -0500

Eric and Randy,

The Tone Remote Adapter is Motorola #TNA200 or L3151A and the cable is
CDN6660A.

The cable says that it is for a RPG model that is mentioned later in the
document as for a Maxtrac 300, GM300 M1125 and SM50/120.  NO mention of a
CDM750.

It sux that a Motorola dealer sold us a rig that requires an external
relay to operate.  I would expect any radio from any manufacturer to
operate without such a quirk.

Now with an external relay added I'm still having trouble.  I connected
the relay with one side + and the other looking for a logic ground from
radio Pin # 4 (on PL detect) OR adapter Pin # 7 (on console Monitor
command).   The adapters PL Monitor provides a closure between it's Pin#
7 and Pin# 14 (GND)
I have both picking up the relay as expected but when radio is connected
to adapter I have a sneak circuit that keeps the relay picked up.  Oh
Yes, I did add blocking diodes on each path !!!!!! 

Thanks guys !  Whatever help that you may give me is appreciated !

On Sun, 10 Nov 2002 16:46:25 -0600 Randy Nelson <[email protected]>
writes:
> > Eric and Randy,
> >
> > I am indeed using a Motorola Tone Adapter. The audio at Pin # 11  
> IS
> > discriminator audio which is ahead of the squelch circuits.  Pin # 
> 11
> > outputs constant noise on - no RF signal,  and audio when RF 
> signal is
> > present regardless as to whether the RF signal contains the proper 
> PL or
> > not.
> 
> Just remembered I have a new tone remote and a CDM1250 to interface 
> for a
> fire dept this week.  I'll let you know how I come out.
> 
> Randy
> 
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> 

Bill Morphy
[email protected]

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