Trev, Well, I got the linear working OK, at least on digital modes which are 99% of my QSOs.
I'm switching it on and off via the COM1 port and an opto-isolator. The opto-isolator switches the base to collector connection (12K resistor in series) of the switching transistor in the main relay circuit of the TL-120. I could have just grounded the bottom end of the main relay (~40mA current, well within the 4N25 opto-isolator limits), but I reckoned the final solution was the more elegant. K2 minimum drive (~0.1W indicated) gives me 30W from the TL-120 at the ATU. It'll run 50 watts RTTY without the fan coming on. Thanks again and 73 Bob 2M0KDZ PS Now for SSB.... _______________________________________________ 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 Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
