[Motorola] MOCOM on Data

Tue, 19 Feb 2002 23:11:17 -0600

so, i essentially need to buiild an amplifier?  Think an LM386 amp inline 
might work?

At 09:04 PM 2/19/2002 -0800, you wrote:
>Ken Cechura wrote:
> >
> > Score one for me, i got the Rx to work.  Score one for the MOCOM 70 (VHF),
> > It won't Transmit.  I had a Kantronics KAM rigged in, and it would key the
> > MOCOM, but i got no audio.  My KPC9612 won't even key up the radio.  Where
> > is the best PTT point, and where is the best place to feed in audio (also,
> > do i need to, in some form, transform the audio?)
> >
> > I have the former mobile 4 ch MOCOM 70 mounted in the Consolette base
> > station, so i have multitudes of wires in it.  any help is much 
> appreciated.
> >
> > Thanks
> > Ken
>
>Hello Ken; Some time back I connected some TNCs to the MOCOM 70. I found
>the mike input jack was expected to be connected to a microphone with an
>amplifier in it. This means that the mike hi pin has a few volts on it.
>If my memory is ok, The transistor that this voltage came from needed
>this voltage terminated with the mike amp. I think the impedance of this
>mike amp was in the neighborhood of a just a few hundred ohms. This also
>meant the the input must have had quite a high level of audio voltage
>from the mike amp. I remember adding a 2n2222 into the mike line and
>played with resister values till I got enough audio voltage to the mike
>jack to make the deviation at 3.6 khz. I think that was about optimum
>for what I think packet works best at.
>73 VE7UW in Kelowna, BC, Canada
>--
>Vive L`Ouste/West libre
>A computer without Microsoft is like a chocolate cake without mustard.
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      //////////////////////////////////////////////////////
     //        Kenneth R. Cechura, KC9UMR                //
    //             [email protected]                     //
   //           President, W0EEE, 2002                 //
  // University of Missouri-Rolla Amateur Radio Club  //
//////////////////////////////////////////////////////