[Amps] Alpha 87A Won't Key
herbert.schoenbohm at gmail.com
Wed Nov 22 19:49:18 EST 2017
Frank, I had the same problem with my Alpha 87A and found a bad connection
on the RCA plug. This can be resoldered by opening up the small plate on
the bottom of the chassis just below the tube socket.
On Wed, Nov 22, 2017 at 5:28 PM, Frank Kirschner <frank.kirschner at gmail.com>
> The Alpha 87A I got in the ARRL auction won't key up.
> I connected to the RS-232 port satisfactorily, and it showed no faults. I
> have the transceiver RF out connected to the RF input of the amp, the RF
> output of the amp connected to an antenna (TH-11), and a relay connected to
> the keying relay input.
> I checked the relay input, and it does short to ground when the transceiver
> goes to transmit. But the amp stays on SDBY, and the OPR light doesn't
> come on.
> Is there something I just don't know to do? I've never used a
> microprocessor-controlled amp before, so there may be a trick to it.
> I'm on 20 meters, so I assume it isn't a 12-10 meter lock-out thing.
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