Larry, Exactly where are the RF levels higher than normal? Obviously not at the output of the Low Pass filter or you would have power output (unless you have the tuner and have set it to ANT2 instead of ANT1 or something like that).
With the requested power set at 5 watts, send us the RF Voltage levels at the W6 jumper, Q5 collector (case), Q6 collector (tab), Q7,Q8 base, and the RF Output jack. With that info, we should be able to home in on the problem area. 73, Don W3FPR > -----Original Message----- > > OK. I'm hoping someone has seen this before I start tearing into things > (and tearing my hair out). > > My K2 started to lose power yesterday. Within an hour, the output > dropped to close to zero (1mW on 160m, 40mW on 10m). There are no signs > of distress or burning odors. > > I checked the ALC... pinned at 5v. Everything looks good in terms of > levels/frequencies thru the XMIT mixer and filters, except the rf levels > are higher than indicated in the manual. I suspect this is due to the > ALC being wide open. > > The dc levels for Q5, Q6, and Q7-8 bases are normal, and the resistance > checks on Q7-8 are OK. 8T looks fine. But the rf levels are all > considerably high, and look pretty ratty except on 10m. The rig draws > about 600ma in xmit. > > Anyone seen this before? > > Larry N8LP > _______________________________________________ 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
