I reviewed the K-2 100W PA diode switching circuit. It's a very clever idea, but it still would be quite expensive and complicated compared to a simple relay substitution. The cost and complexity is not in the 1n4007 diodes, but in the surrounding control circuitry and the +150V power supply you need to make it work.
I was told the relays in the SDR were 3ms relays except the relays in the PA. Ten Tec uses relays in its QSK T/R scheme even up to its high power amps and they are not vacuum relays, so I can't see the advantage of a $50+ 1N4007 diode circuit over a ten bux substitution of fast drop-in relays. 73 W9OY __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
