Hi Dennis,
Everything you need is right on the top row of screw
connections (plus a number of things you don't need).
I labeled all the connections on the top with a fine
point sharpie marker.
There is a small 600 ohm (telephone) line driver board
option, which most often lives on the chassis where
supplied... many people use it for the controller
receive audio source [it can supply sub tone filtered
(PL, CG or CTCSS) de-emph and gated receiver audio
to the external controller] when properly terminated
to a resistor.
If you don't have the line driver board, you end up
using the (terminated) speaker audio or ungated -
unfiltered discriminator audio.
COS is available on the screw terminals... be carefull
as the AC Mains screws are nearby. You should add some
type of safe shield or cover over the AC Mains ("mains"
makes you think I'm from England/Europe... eh?) unless
you're really carefull and trust yourself near exposed
ac contacts.
TX Audio is a bit tricky, there is a diode switch in
the tx audio path that needs a resistor to + positive
voltage to turn it on (bias). The answer is just a
resistor from the 10 or 12 volt supply to the proper
mic-hi terminal connection... it's been more than 5 min
so I'd have to go find a Master Pro in the way back...
to tell you the exact resistor value & connection I used.
If you don't make the mentioned resistor/bias connection,
the tx line in audio will sound distorted.
A small fan moving light air over the power supply
back side will make the filter capacitors much
happier as they live near some very hot bleeder
resistors.
Good luck, enjoy the Master Pro and pray you're not
paying the electric bill.
cheers,
skipp
skipp025 at yahoo.com
www.radiowrench.com
> "Dennis Adams" <[EMAIL PROTECTED]> wrote:
>
> Greetings,
>
> I have a GE Mastr Pro Deskmate with the 4EP38A10 Power Supply. The
> question I have... are the barrier strips at the top the same
pinouts
> for the TX/RX strips as the 4EP38A12 power supply? I have the
4EP38A12
> Schematic.
>
> I am wanting to hookup a controller and wanted to make sure I have
the
> COS, audio, PTT, etc correct for wiring.
>
> Better yet if someone has a schematic for this unit that would also
> detail the barrier strip designations, please contatct me. I will
pay
> for a schematic of this power supply.
>
> Thanks,
> Dennis / KB8YGC
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