The 922 t/r relay circuit is 100V and 40ma. If your 990 can output +12 v on
xmit, you can use a power NPN transistor to switch the 922 line to ground.
Collector to the 922 rly line, emitter to gnd and a voltage divider on your
+12 from 990 will do the job and put minimal stress on the 990. 73, Dan,
N5AR
----- Original Message -----
From: David Jones <djones449@cogeco.ca>
To: Amps Reflector <amps@contesting.com>
Sent: Tuesday, January 21, 2003 6:02 PM
Subject: [Amps] FT-990 keying TL-922?
> Hi all,
>
> This weekend, two of us will be keying a TL-922 (his) with an FT-990
(mine)
> for this one time only in the CQ160. Just want to be sure I'm reading the
> manual correctly....
>
> 1) What is the t/r keydown voltage and current on the TL-922 at the PTT
jack
> (and can the FT-990, rated at up to 50vdc and 500mA handle it - don't want
> to activate the internal relay for one weekend)?
> 2) Using the "remote" jack on the 990, and not worrying about QSK, would
pin
> 4 and pin 3 be the pins???
> Thanks... see you on 160m!
>
> David VE3STT
> ve3stt@rac.ca
>
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