Gregg, Glad to hear you have the KSB2 problem licked - that was a tough one!
On your power output on the higher bands, the first thing to check is T2 - it should have the correct number of turns and look just like the diagram in the manual - it is also good to space this transformer above the board by about 1/8 inch - it will self support on its own leads. T4 is another possibility and T1 as well. Is there any chance that T4 is installed backwards? Are the two links on T4 installed correctly? Are both Z1 and Z2 in place? C127 and C128 should be installed correctly, well soldered and should be 680 pf. If all that checks out, try comparing the RF Voltage produced by a normal output band with one of the low output bands (turn the power all the way up when doing that test) - check at several points along the transmit chain - Q5 base (junction of R40 and R41 can be reached from the top), Q5 collector (case), Q6 base, Q6 collector, Q7/8 base and if you are using a 'scope with an 10X probe, the collector of Q7/8 (do not measure that with an RF Probe, the diode may be zapped by the RF Voltage). Due to the way the K2 power control circuits work, you can expect to see a higher RF voltage on the 'bad' bands than the 'good' bands up to the point where the problem exists. Again, crank the power up to full when doing this comparison test - if you leave it low, everything may look good on all bands and your testing will be inconclusive. 73, Don W3FPR > -----Original Message----- Now ive got other problems. > Don't think they are related. Power > out put drops off seriosly on 20 15 es 10 meters 20, max pwr > out = 5 w. 15 = 1 w. 10 = less than 1 watt. May just be improper > alignment. I'll let you know what i find. Suggestions wellcome. > I'd like to agn thank all of the fine people on this reflector > for all ur help. The caliber of support for Elecraft products is > exceptional, and i have confidence that this rig will be playing > as it should very soon. VY 73's to all, Gregg Mulder > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.430 / Virus Database: 268.15.6/565 - Release Date: 12/2/2006 9:39 PM _______________________________________________ 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
