I did not look closely enough. I have a K2/100 and it does have a key line for external amplifiers. What I cannot find in the Elecraft documentation is the maximum current and voltage that it can switch. I am thinking of building the QSK switch shown on p. 76 of the February 2008 QST to run an old tube-type amplifier QSK. That device requires a key line that can switch +52VDC at 100 mA. My question is, can Q9 in the 100 Watt module handle those levels directly, or do I need to use an isolating device like the Ameritron ARB-704? 73, Steve Kercel AA4AK _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft
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