K2 "not hearing"
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I was going along fine on all my preliminary checks on my K2
"revival", got the sidetone going OK, then started in on the secondary checks. To my dismay, I can't hear anything on any band, and I'm now wondering if I let the smoke out of something in the receive. Not being very good at tracing the schematic, I can't tell if the sidetone uses the same circuit to the headphone plug that the receiver does or not. Could I have fried a diode someplace, with that one problem of getting the KIO2 wires "backward" when I wasn't paying attention, in the course of setting up for the KAT100 addition? This is beginning to get old - I'm using dummy load more often than anything, and the SWL isn't a good result from all the hours. Any ideas, out there? Tnx, 73's Gil WA5YKK > _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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Not hearing well could be the need for the filter alignments. Not sure
where you are in the process, there are voltage checks you can make in the rear of the book, to help you understand where things should be. Check your regulators, 8v and such to see they are running properly. There is signal tracing information on N0SS or Don's site. With general information, I can only give you general answers. David Wilburn [hidden email] K4DGW K2 #5982 Gil Gibbs wrote: > I was going along fine on all my preliminary checks on my K2 > "revival", got the sidetone going OK, then started in on the secondary > checks. To my dismay, I can't hear anything on any band, and I'm now > wondering if I let the smoke out of something in the receive. Not being > very good at tracing the schematic, I can't tell if the sidetone uses > the same circuit to the headphone plug that the receiver does or not. > Could I have fried a diode someplace, with that one problem of getting > the KIO2 wires "backward" when I wasn't paying attention, in the course > of setting up for the KAT100 addition? > This is beginning to get old - I'm using dummy load more often than > anything, and the SWL isn't a good result from all the hours. Any ideas, > out there? > > Tnx, 73's > Gil WA5YKK > >> > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > 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 mailing list Post to: [hidden email] 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 |
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In reply to this post by Gil WA5YKK
Gil,
The sidetone signal does inject into the audio amplifier differently than the receiver audio. The first thing to check is the 'dumb stuff' - did you remove the KAF2 or KDSP2 and fail to put it back in. That would create a break in the audio path. Bid you remove the KSB2 and/or the KNB2 and not re-install them (or offset the pins in the headers) - that would break the receive path at the IF. If those things above do not restore a working receiver, try the Quick and Dirty Signal Tracing method first. You can download the document from the Elecraft website or you may also find it at Tom Hammond's (Tom is the author) website www.n0ss.com 73, Don W3FPR Gil Gibbs wrote: > I was going along fine on all my preliminary checks on my K2 > "revival", got the sidetone going OK, then started in on the secondary > checks. To my dismay, I can't hear anything on any band, and I'm now > wondering if I let the smoke out of something in the receive. Not being > very good at tracing the schematic, I can't tell if the sidetone uses > the same circuit to the headphone plug that the receiver does or not. > Could I have fried a diode someplace, with that one problem of getting > the KIO2 wires "backward" when I wasn't paying attention, in the course > of setting up for the KAT100 addition? _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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Sorry folks, it must be too early in the morning.
Tom Hammond's website is www.n0ss.net NOT the '.com' that I sent earlier. 73, Don W3FPR [hidden email] wrote: > Something is ROTTEN IN DENMARK as that web sight comes up with Home > EQUITY loans :-))))))))))) >> Gil, >> >> The sidetone signal does inject into the audio amplifier differently >> than the receiver audio. >> >> The first thing to check is the 'dumb stuff' - did you remove the KAF2 >> or KDSP2 and fail to put it back in. That would create a break in the >> audio path. Bid you remove the KSB2 and/or the KNB2 and not >> re-install them (or offset the pins in the headers) - that would break >> the receive path at the IF. >> >> If those things above do not restore a working receiver, try the Quick >> and Dirty Signal Tracing method first. You can download the document >> from the Elecraft website or you may also find it at Tom Hammond's >> (Tom is the author) website www.n0ss.com >> >> 73, >> Don W3FPR Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by Don Wilhelm-3
Don, et all; I'm now wandering around in the menu of "ATU", attempting to make sure the circuits are working right in the KAT2 that I didn't prove out a few weeks ago. When the instruction told me "Set the ATU parameter to AUTO and exit the menu", then "Turn the power off and back on. Use the menu to verify that the ATU parameter is still set to AUTO." I found that I had to find "ATU" again, and noted that the parameter is set to "AUTO", so I'm hoping that the system is doing OK. I'd hate to have to look at U2 on the ATU, try to sniff out yet another problem with a solder connection! Gee, this started out to be a fun project, and now I'm having to double check every tiny item that's in doubt. Does anyone have a different reading than I have? Tnx, 73's Gil WA5YKK _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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