In addition to the circuit elements that Vic pointed out, the KPA100 LPF relays (they are not latching) must be held in the active state for the current band, and that takes a bit of the current too (from the 12CTRL line which originates in the base K2).
73, Don W3FPR > -----Original Message----- > > Ron D'Eau Claire wrote: > > I don't' see the message here, but Jack, W6FB, e-mailed me > off-list that the > > parasitic drain continues from the low-current supply as long > as the KPA100 > > is installed. Only the PA transistors get current only from the > high-current > > connector. That sounds like what you're saying Don. > > Yes, the birdie-generator (oops, bias oscillator) which provides high > voltage for the diode T/R switch and -12v for the RS232 port must run > even if the KPA100 is inactive. It gets its power through the 12CTRL > line which is in the ribbon cable. > > -- > 73, > Vic, K2VCO > Fresno CA > http://www.qsl.net/k2vco > _______________________________________________ Elecraft mailing list Post to: [email protected] 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
