RF POT (K2)
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My audio cuts out momentarily whenever I rotate the RF gain pot. I suppose the RF gain pot is generating noise (dirty) and that noise is triggering the AGC. I do find that if I rapidly rotate the knob back and forth through perhaps ninety degrees a dozen times or more, the problem is temporarily reduced.
1) Do others have this problem? 2) what is the recommended solution? I have never done the AF pot mod because it is not noisy at all. tnx, fred kt5x K2 # 0700 Palm # 0070 _______________________________________________ Elecraft mailing list Post to: [hidden email] http://mailman.qth.net/mailman/listinfo/elecraft You must subscribe to post. Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm Elecraft page: http://www.elecraft.com |
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K2 2330 experiences the same malady. Even a slight bump will cause this.
I'm waiting to get in there and replace the pot. Just having too much fun to open her up. Hate to replace it and have the problem resurface. 1) yes. 2) ?? AF pot gives plenty of volume with no scratchiness so no problem there. take care Indy wrote: >My audio cuts out momentarily whenever I rotate the RF gain pot. I suppose the RF gain pot is generating noise (dirty) and that noise is triggering the AGC. I do find that if I rapidly rotate the knob back and forth through perhaps ninety degrees a dozen times or more, the problem is temporarily reduced. > >1) Do others have this problem? > >2) what is the recommended solution? > >I have never done the AF pot mod because it is not noisy at all. > >tnx, > >fred >kt5x >K2 # 0700 >Palm # 0070 >_______________________________________________ >Elecraft mailing list >Post to: [hidden email] >http://mailman.qth.net/mailman/listinfo/elecraft >You must subscribe to post. >Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm >Elecraft page: http://www.elecraft.com > > > -- 73 Fernando N2FQ/NNNØJYM ex-NF6Q San Jose, CA <http://pages.sbcglobal.net/n2fq> _______________________________________________ Elecraft mailing list Post to: [hidden email] http://mailman.qth.net/mailman/listinfo/elecraft You must subscribe to post. Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm Elecraft page: http://www.elecraft.com |
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>My audio cuts out momentarily whenever I rotate the RF gain pot. I
> >suppose the RF gain pot is generating noise (dirty) and that > noise is > >triggering the AGC. I do find that if I rapidly rotate the > knob back > >and forth through perhaps ninety degrees a dozen times or more, the > >problem is temporarily reduced. > > > >1) Do others have this problem? > > > >2) what is the recommended solution? Mine on K2 2198 has the same problem and has had it for a long time. It helps to push the RF pot gently inwards as you turn it, but I am planning a replacement ... some time.. 73, Sverre ------------------ Sverre Holm, LA3ZA www.qsl.net/la3za _______________________________________________ Elecraft mailing list Post to: [hidden email] http://mailman.qth.net/mailman/listinfo/elecraft You must subscribe to post. Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm Elecraft page: http://www.elecraft.com |
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In reply to this post by Indy-3
Fred:
I had this problem with s/n 744. A postmortem showed that the plastic shaft inside was breaking apart into little pieces that would get behind the wiper, making contact problematic. I think the cause was excessive play in the shaft, noted by its being able to be moved sideways significantly. Normal side pressures during usage were causing the shaft to grind apart against the bushing housing. I replaced the pot. It is not that bad a job. And then I added a nylon washer between the knob and the panel to relieve the possibility of damaging side pressure. I put these washers behind all the smaller knobs. I found some black nylon washers that had exactly the right inside and outside diameters so that they look just like part of the knob. I found them at my local hardware store, but I don't know how universally available they are. They are made by Hillman Co. of Cincinnati, OH, and are their part number 58059-N. The ID is .257", OD is .5", and the thickness is .062". Once in place, with the knob snugged up just enough to allow free (non binding) turning through the entire range, there is hardly any noticeable sideward motion to the knobs. I haven't had a problem since (knock on wood). best wishes, dave belsley, w1euy On Jun 19, 2004, at 11:31 AM, Indy wrote: > My audio cuts out momentarily whenever I rotate the RF gain pot. I > suppose the RF gain pot is generating noise (dirty) and that noise is > triggering the AGC. I do find that if I rapidly rotate the knob back > and forth through perhaps ninety degrees a dozen times or more, the > problem is temporarily reduced. > > 1) Do others have this problem? > > 2) what is the recommended solution? > > I have never done the AF pot mod because it is not noisy at all. > > tnx, > > fred > kt5x > K2 # 0700 > Palm # 0070 > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > http://mailman.qth.net/mailman/listinfo/elecraft > You must subscribe to post. > Subscriber Info (Addr. Change, Unsub etc): > http://mailman.qth.net/subscribers.htm > Elecraft page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] http://mailman.qth.net/mailman/listinfo/elecraft You must subscribe to post. Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm Elecraft page: http://www.elecraft.com |
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