Re: [Amps] QSK for TL-922 - correction

[Will Matney <craxd1@ezwv.com>]

After I wrote the reply, I went by Rich's website and took a look. This 
uses two (2) SPDT vacuum relays, not one (1) DPDT. Sorry about that!

Schematic:   http://somis.org/D-a-07.GIF

Will Matney


>Hello,

I think the way Rich has it is first he takes out the old antenna relay 
and replaces it with a DPDT vacuum reed relay. Then the switching is 
done from the jack(s) by either switching the coil to ground directly or 
by using a transistor switch if the transmitter has positive switching. 
This would allow either type of transmitter to be used. Next, when the 
relay closes, current is drawn through an opto-isolator. This is turns, 
puts a bias voltage on the base of a large transistor switch, and is 
connected in series with the cathode lead of the tube. There's a diode 
string in series here also to adjust the bias voltage. It goes back to 
the B- supply, and through a resistor to ground for the plate current 
meter. The power for the antenna relays coil is derived from a 
rectifier/voltage-divider off the line voltage (+150 Vdc supply). I 
don't think I left out anything, if so Rich will correct me.

Will Matney

QSKguy@aol.com wrote:

> Hello,
> I just bought an used TL-922 to get QRO and would like to use it in 
QSK mode. I found the Richard Measure interesting site explaining how to 
modify the TL-922 but I don't really understand.
> Is there some TL-922 / QSK owner over there who can explain me how to 
integrate this kit in an unmodified amp ? A schematic would be great too.
> Thanks a lot.
>
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