Your modification requires a person to go inside the radio and make a change to
a SMC circuit board in regards to Q16.
Q11's collector is already present at the "TX OUT" jack. This is what I am
suggesting Jim and others who do not want to get inside their radios, use to key
BOTH the "TX EN" jack and the "RELAY" jack on the 87A...through steering diodes
external to the radio. Take the keying line from the "TX EN" jack through a
diode...take the 87A "relay" jack line through a diode...sum them together into
the "TX OUT" jack.
Terry - W6RU
Paul Christensen wrote:
> The steering diodes are not necessary. All the parts needed are already
> there. The input to R29 is bridged across the TX OUT line. Then, the
> collector of Q16 is sent directly to the RELAY RCA jack.
> End of Modification.
> -Paul, W9AC
> -----Original Message-----
> From: w6ru <email@example.com>
> To: Jim Reid <firstname.lastname@example.org>; email@example.com
> Date: Sunday, September 20, 1998 8:34 PM
> Subject: Re: [TenTec] Omni QSK with Alpha's 87A QSK
> >My error !
> >This time I see the keying of this circuit...not sure why it didn't show
> >first time.
> >THIS MAKES IT SIMPLE...
> >Just let that "TX OUT" jack key BOTH the "TX EN" jack on the Omni 6 AND key
> >"RELAY" jack on the 87A. I would use two steering diodes, one in each
> >to isolate the circuits from each other in the receive mode.
> >Hope this helps.
> >Terry - W6RU
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