Fraser, Not a mod, but an alignment may have been overlooked. The K2 bandpass filter is shared between 160 and 80 meters, so it often must be adjusted to a compromise setting to balance between the two bands. Adjust the bandpass filter for a peak on 160 meters, and then adjust it for a peak on 80 meters and observe how much difference there is. Then initially set it to a mid-point and then if desired 'tweak' it a bit to achieve the best balance on both bands.
73, Don W3FPR > -----Original Message----- > > I've just noticed that our club's K2/100 (#3764) draws excessive > current on > topband. > > Going through the bands my own K2/100 (#4368) draws between > approx. 15-19A > at full power setting, (circa 100W o/p). The club rig draws > between approx. > 16-20A in the same test, but on topband the current consumption is 27A !! > > I did not build the clubs rig, but the ham who built it has built several > K2's. > > Both rigs have the latest mods/screening/upgrades, including the PA > instability fix for 80m. There does not appear to be any instability on > topband - I've checked on a scope and spectrum analyser. > > It's possible the club's PA missed out on a mod early in it's life? > > Any ideas please? Looks like it's short of some L or C somewhere. > > Thanks, Fraser G4BJM > _______________________________________________ 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
