[Elecraft] Hi-Cur problem
Hi, I have been building a K2/100 for a friend, and it has all been going very smoothlyuntil tonight. I had the amp installed and it put out the output it should on all bands, but I didn't have the power calibration as good as I liked so I took the amp out, removed the shield and set it up along-side the K2 ready to adjust. Set to 5w, press tune on 40m and the HI-CUR warning comes up. I then find it does that on *all* bands EXCEPT 80m. I take things apart and find it is a problem in the basic K2 ( #4506) Time for bed here and I am not thinking straight, but that has me bluffed at present. I am assuming the problem is most likely in the LPF as the amplifier must be looking into a short or open cct. Can anyone come up with a thought or two as to what has gone wrong? The relays seem to be switching as I change bands. I have been over both sides of the RF board with a head-band magnifier...it eludes me at present! Cheers...Ron ZL1TW ___ 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] MFJ 4103
Hi Elecrafters, Does any one have any info on the MFJ miniature psu type 4103? Although it is a sealed unit I wish to adjust the output to keep my internal battery charged. The nominal output voltage is 13.8 and I wish to adjust to give 14.2 as measured by the K2. I think the unit could be carefully cut open and after adjustment sealed up again. Before starting on this exercise I thought I would check with your collective wisdom. 73 Max/ZL4vv ___ 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 #04506 is alive and well
Hi, Am Pleased to announce that K2 # 04506 is all finished and waiting for it's first contact. ( Later this evening) The build was done over 4 leasurely days. Everything was present, thanks to Christine (who packed the modules) and it was a no-hassle build. It's kinda nice to have a K2 with pristine boards, instead of having odd components sticking out from the "A to B" mods that were done on my original series "A" K2 ( #2204)(I'll have to leave the lid off for a while :-) It never fails to amaze me that such a complex kit can be assembled to specification by almost anyone. It certainly speaks volumes for the design team One thing I tried this build, was using very thin resin cored 60/40 solder ( 0.56mm). It was absolutely marvelous. The flux residue was almost non-existant, and the amount of control I had over each joint was fantastic. Apply the iron tip and solder together and start feeding the solder as the hole fills. Any fillets on joints were small, and over-all it makes for a very tidy job. Cheers...Ron ZL1TW ___ 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
Re:[Elecraft] Faulty resistor pack
Hi Bob, ( and Reflector readers) If you have a look at the Control board diagram, you will see that RP3 is 5 x 47k individual resistors. The one I took out is also correctly marked "A 473G" RP3 1/2 is used with U10a in the ALC circuit RP3 3/4 and 5/6 is in series with the sidetone cct and U10b RP3 7/8 is with U10d ( V bfo) RP3 9/10 is with U10c ( V Bias-xfil) The fact I can measure it end to end or to any leg with varying resistances up to 93k would indicate it is indeed 100% faulty. I recorded it on the reflector as I don't recall it being mentioned before. I suspect it is a component that has "fallen through the cracks" at the time of manufacture, and probably somewhat unusual. Cheers...Ron ZL1TW ___ 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] Faulty Resistor pack...
Hi , Just been fault finding a K2 for a chap here. the problem was no V bias-xfil , so the filters couldn't be set. Nothing appeared to be coming out of U10 on the Control board, and resistance values around it seemed odd, so I gave the IC the chop. The resistances were still strange impossible in fact, and it appeared that both RP2 and RP3 might be crook. Something that sounded too strange to be true. I took out RP2 ( 82k) . Better, but still had strange readings, so out comes RP3 ( 47k) and the readings looked like what one would expect with all the components removed!! Metering RP3 showed it was not 5 individual resistances. They were all joined together and ranged in resistance from 93k to 41k. In fact I was getting a reading of 90k from pin 1 to pin 10..no wonder the poor old ( now deceased) U10 was not functioning. Has anyone else been fooled by a crook RP?? It sure had me bluffed for a while.. Incidently..RP2 was finebut has rather short legs now... Cheers...Ron ZL1TW ___ 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 voltages for 160m band??
One for the expertstoday I re-checked my VCO voltage readings for each band ( they were fine), but I realized that the table lists all bands except the 160m band. Unless I am wrong, there is nothing in the 160m module instructions to tell you what VCO voltage to expect, so I tried a few readings there and was quite surprised at how little voltage I actually had. At 1800KHz I read only 0.61v and that rises to about 1.0v by about 1900KHzstill somewhat less than the 1.5v minimum suggested. I can forget about the statement in the manual where it says" Receive-only operation down to about 1.4MHZ is possible"..as my VCO drops to 0.0v at 1600KHz. How does this compare with *your* K2 VCO readings?? My K2 is a pre-3000 set with all the mods and up-grades to bring it up to latest series specs. It is quite conceivable it is not "up to specs" on 160m :-( but it appears to work fine there even with low VCO voltages! Cheers..Ron ZL1TW ___ 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] Gary's top 10 list of kit failures.
Hi, Nothing much to do this morning so was surfing the Elecraft site and found Gary Surrency's list of common errors that builders make to their "K" kits, and while I might be out of date here, perhaps a list like this included with each new kit might improve the success rate of builds in some instances. I refer of course to http://www.elecraft.com/Apps/gary's_top_10.htm I didn't know the "Apps" list existed until today and has *lots* of info of all types regarding Elecraft kits including the one by Gary. Am I the only one who has missed this site?? Cheers..Ron ZL1TW ___ 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
