Here it is again, I got no response from the last post. I've built the
little 2 transistor circuit but not tried it yet connected to the K1.
Hi folks I am using my K1 to drive the tube PA in an old TS520 and it works
great but I'm using manual keying of the TS520. I have been reading the
various posts here on keying an amp from the 8R line of the K2. I want to
do the same thing on the K1. I figure that if I use the 6A and 6R line from
the 3 pin connector on the filter board (connector J1 for the Kat1) it will
work the same as the K2 mod. I guess I will have to set the K1 QSK delay
much longer in the K1 to prevent the old TS520 switching too often. The
TS520 keying line has +15 V on it and it goes to ground with 2.5mA drain. I
propose to use the little two transistor circuit shown on the Elecraft Web
site or something similar. If I use a bipolar in stead of a fet and a 10K
to it's base I reckon I'll get 2.2mA draw on the 6A line and 0.5mA on 6R
line when in Rx and 0.5mA on the 6A line on Tx.
Does all this seem OK to you experts? Is the 6R line the best one to use?
Don't want to damage anything.
Martin
M0KWV
K1 #1534
Why not take a look at our Web site?
http://www.simoncarves.com
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