Have our club's K3/100, serial # 67xx. When it is cold (FP=11C 52F ), increasing the frequency using VFO A or VFO B causes a 1MHz jump DOWN in frequency. When reducing frequency the failure is much less frequent and it will also jump down 1 MHz. At times while tuning up in freq there are some relay clicks - usually 2 - but no frequency jumps.
BOLD = actions / changed made More observations: . I picked up the radio, we are having an unusually warm spell here in NY. The rig seemed to work perfectly. . I put it in my fridge. FP temp = 11C (52F) Fails frequently. Always a 1 MHz jump down. i.e on 7.125 the fail sets the freq to 6.125. . With the rig on 80M, band down press yields 100.00MHz. If I manually enter 1.80 it is on 160M, band up = 80M, band down is back to 100MHz. Per the setup, 160M and 6M are excluded from up/down sequence. . Rig warming up, FP = 21C Operates normally . Back to the fridge, FP=12 . Starting on 40M, increasing VFO A will cause switch to 6MHz. Pressing Band UP gives 80M not return to 40M. . Similar to above, starting on 30M the rig jumps to 9MHz, band UP gives 80M . Again similar, starting on 20M, jumps to 13MHz, band UP gives 80M . Occasional jumps to 3xxMHz - difficult to see pattern . Rig up to FP=19C working normally . Backed up the CONFIG, performed EE INIT, restored CONFIG . Cooled off the rig FP = 12 . Not seeing the 80M band DN going to 100MHz. Not seeing random 3xxMHz . Still have frequent jump down 1MHz . Removed Front panel, removed DSP board. Reseated both twice. . Working normally at room temp . Cooled off the K3 FP = 13 . Failing as above, 1MHz down shifts . FP = 15+ seems to be working OK . Cooled off the rig . Exercised frequency control and band changes via RS232 - this rig is also operated remotely - no failures noted . Other freq jumping as above occurring via manual tuning. Net: EE INIT seems to have "cured" the 80M band DN to 100mHz & random shift to 300MHz. Sorry for the loooong post. What y'all think? Trip to California - or poor man's fix: turn up the heat in the club's shack (it is unheated!) I'm a tiny bit tempted to swap front panels with my personal K3 - very tiny. THX for reading, 73 Bill N2BC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
