Open Pot on 52.450 mhz
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Open Pot on 52.450 mhz
 
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I have what sounds like an open mic inside the radio on 52.450 mhz. It actually sounds like a open mic inside the radio and when I tap on the top, I can hear feedback. Then if I talk into the "grill" on the top of the radio, I can hear my voice in feedback. I want to make this clear that the TX is not transmitting and I am receiving static/noise on that frequency. I can hear an open mic when my receiver is wide open. Any way to resolve this issue. So far, I don't use that frequency for anything but it would be nice resolve it.
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I think all K3s probably do this. Mine does at 52.445.81! I suspect we are
listening to the synthesizer and the vibrations a modulating the frequency via a mechanical path to the L component in the oscillator. Mike, KE4U -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of -.-. --.-N3TU -.-. --.- Sent: Saturday, November 08, 2008 8:57 PM To: [hidden email] Subject: [Elecraft] Open Pot on 52.450 mhz I have what sounds like an open mic inside the radio on 52.450 mhz. It actually sounds like a open mic inside the radio and when I tap on the top, I can hear feedback. Then if I talk into the "grill" on the top of the radio, I can hear my voice in feedback. I want to make this clear that the TX is not transmitting and I am receiving static/noise on that frequency. I can hear an open mic when my receiver is wide open. Any way to resolve this issue. So far, I don't use that frequency for anything but it would be nice resolve it. -- View this message in context: http://n2.nabble.com/Open-Pot-on-52.450-mhz-tp1475474p1475474.html Sent from the Elecraft mailing list archive at Nabble.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 -- I am using the free version of SPAMfighter. We are a community of 5.6 million users fighting spam. SPAMfighter has removed 1726 of my spam emails to date. Get the free SPAMfighter here: http://www.spamfighter.com/len The Professional version does not have this message _______________________________________________ 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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I confirm this on S/N 125 FW version 2.63
DATA mode on 52.445.81. The K3 is very microphonic at that frequency in Data mode. The frequency changes with SHIFT and with MODE and crystal filter XFIL selection. With 1.8k filter the tone is found at 52.447.66 at a lower level and the microphonic effect is less. With the 500Hz filter the tone is heard at 52.446.75. Just a little microphonic with the narrow filter. The frequency jumps appear to be related to the filter frequency offset setting. For me this is not an issue as long as it does not show up elsewhere, but the tone could be important for some transverter users. Oh my! Did we finally find something to complain about or will Wayne and Lyle make it go away as usual? I certainly hope this will not become a distraction from the existing to do list. Aloha, John KH7T (K3 #125, practically perfect and getting better every day) Mike McLendon wrote: > I think all K3s probably do this. Mine does at 52.445.81! I suspect we are > listening to the synthesizer and the vibrations a modulating the frequency > via a mechanical path to the L component in the oscillator. > > Mike, KE4U > > > _______________________________________________ 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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I just checked these freqs/modes on my K3/100 (ser 732, FW 2.46, stock
2.7KHz filter) and could not duplicate this. I manually scanned from 53.3 to 52.5 and ran across a few weak birdies but nothing like what has been described here. You may want to check the archives because I seem to remember this issue coming up a few months ago but don't know what the resolution was. Russ, N3CO ----- Original Message ----- From: "John Buck" <[hidden email]> To: <[hidden email]> Sent: Sunday, November 09, 2008 1:21 PM Subject: Re: [Elecraft]K3 Open Pot on 52.450 mhz >I confirm this on S/N 125 FW version 2.63 > DATA mode on 52.445.81. > The K3 is very microphonic at that frequency in Data mode. The frequency > changes with SHIFT and with MODE and crystal filter XFIL selection. > With 1.8k filter the tone is found at 52.447.66 at a lower level and the > microphonic effect is less. With the 500Hz filter the tone is heard at > 52.446.75. Just a little microphonic with the narrow filter. The > frequency jumps appear to be related to the filter frequency offset > setting. > > For me this is not an issue as long as it does not show up elsewhere, but > the tone could be important for some transverter users. > Oh my! Did we finally find something to complain about or will Wayne and > Lyle make it go away as usual? I certainly hope this will not become a > distraction from the existing to do list. > > Aloha, > John KH7T (K3 #125, practically perfect and getting better every day) > > Mike McLendon wrote: >> I think all K3s probably do this. Mine does at 52.445.81! I suspect we >> are >> listening to the synthesizer and the vibrations a modulating the >> frequency >> via a mechanical path to the L component in the oscillator. >> Mike, KE4U >> >> >> > > _______________________________________________ > 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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