Re: [Elecraft] VCO Alignment Troubles
> Check and re-check the capacitor values. From the bands that seem to me to > have strange voltage readings, C73 (should be 47pf) and C74 (should be 20 > pf) are the most likely culprits. Not the caps (after a quick trip to Radio Shack to pick up a new 20pf and 47pf). > Other things to check: be certain the menu parameter for D19 is OFF - check > the relays K13, K14 and K15, set the K2 for the band to be checked and > compare the set/reset condition of each relay by checking continuity from > pin to pin. Would the voltages I got make sense if I had a K14 that wasn't latching? I checked it out and it appears to be staying in the reset position. It seems that the bands I'm having voltage issues on are all connected through K14 (40, 30, 20, 12) . (The first time I checked the relays, I did the check when 80M was the last band I used. This time I checked with 40 being the band.) D19 was off. I didn't even know about the second menu until I had to look up to verify the setting! I really hope it isn't K14. I'm not looking forward to having to replace a relay. tim ___ 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
[Elecraft] VCO Alignment Troubles
Hello all (again). I'm attempting to align the VCO and am having trouble making it lock on all bands or get to the right voltage range. I've verified all components on the board and touched up the solder on the pertinent components and relays (and verified all paths/continuity), but nothing changed. Here are the voltage values I get when attempting to set L30: Low High 80M 1.937V 6.000V 40M 8.000V 8.000V 30M 0.597V 0.710V 20M 0.589V 1.148V 17M 3.054V 3.250V 15M 1.962V 2.944V 12M 1.131V 1.251V 10M 2.336V 4.060V No setting of L30 will cause 40M to lock. I also hooked up the frequency counter to TP3 per a suggestion previously on the list and it measured 8.something MHz on 40 (which doesn't seem to be right. I adjusted the spacing on the turns of T5, either pushing them apart or moving them closer. I was able to bring the lower 20M voltage up to 1.5V, but then the VFO wouldn't lock on 80. Thanks in advance for any help you can provide. (And thanks to Don for correctly surmising that my previous problem was due to a thermistor board issue.) tim -- Tim Cailloux W4EGT ___ 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
[Elecraft] VCO Alignment
I'm finally getting back to working on the K2 after two months of avoiding re-winding T5. Anyway, it's been rewound and checks out. I'm now attempting to align the VCO and am having another issue. When I connect my DMM to R30, the voltage is 17.2V and no amount of adjustment on L30 will vary that voltage. Any suggestions? I've verified L30 and C72. tim -- Tim Cailloux W4EGT ___ 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
[Elecraft] Control Board Strageness
My Christmas project of the K2 build got started early (s/n 4539). Here are the two problems I have right now: * Display LCD (i.e. text readout) is very dim. It's almost impossible to read with the backlight off. Everything displays as normal, but just very dim text. (The LED backlight comes right on and is great.) * When adjusting the pot on the control board (R1) for 3.80V per the alignment procedure during the checkout of the control board and display board, the most I can get is 3.6V. The measured and reported supply voltage is 14.7-14.8V and the current draw varies between 80 and 100 mA. Yes, I've checked the solder joints. First item I looked at. I was using a pretty bad DMM (since I started the build much sooner than I planned, I didn't have everything with me) but I *think* the resistance checks were all normal (I'm stealing a better DMM from work this weekend). Thanks in advance, tim -- Tim Cailloux W4EGT ___ 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
[Elecraft] K2: Control Board Strangeness
My Christmas project of the K2 build got started early (s/n 4539). Here are the two problems I have right now: * Display LCD (i.e. text readout) is very dim. It's almost impossible to read with the backlight off. Everything displays as normal, but just very dim text. (The LED backlight comes right on and is great.) * When adjusting the pot on the control board (R1) for 3.80V per the alignment procedure during the checkout of the control board and display board, the most I can get is 3.6V. The measured and reported supply voltage is 14.7-14.8V and the current draw varies between 80 and 100 mA. Yes, I've checked the solder joints. First item I looked at. I was using a pretty bad DMM (since I started the build much sooner than I planned, I didn't have everything with me) but I *think* the resistance checks were all normal (I'm stealing a better DMM from work this weekend). Thanks in advance, tim -- Tim Cailloux [EMAIL PROTECTED] W4EGT ___ 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
