[K2] No RCV audio...
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My K2 appears to have a receiver problem. Specifically, I don't hear any
receive audio, unless navigating into the menu systems, at the 'OPT' section or the 'ATU' section. When those parts of the menu are active, receive audio can be heard. When one exists the menus, the audio falls off, and the s-meter indicates no apparent RF input. Is this a control problem (something wrong on control board)? Tests of K2-100 LP filters, and 1N5711 diodes in the SWR circuitry appear OK. This radio has up until now, worked fine. Any suggestions would be helpful. Thanks Eric ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Eric,
That is indeed strange. Go to the secondary menu and see if Squelch might be turned on. I can't think of another reason at the moment. 73, Don W3FPR On 5/9/2016 10:56 PM, Eric Thielking wrote: > My K2 appears to have a receiver problem. Specifically, I don't hear any > receive audio, unless navigating into the menu systems, at the 'OPT' > section or the 'ATU' section. > > When those parts of the menu are active, receive audio can be heard. When > one exists the menus, the audio falls off, and the s-meter indicates no > apparent RF input. > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Don:
Thanks for the help. The squelch is off. Taking the testing further, it appears that the CAL PLL fails (Info 232) when connected into the TP1 test port. The initial frequency I happen to see (when the test starts) is 11348. I happened to read an older post about this subject, and went down that road (as you had suggested). I have found the following results, when trying various things, namely: 1. Voltage Controlled Oscillator Readings. 80m 2.243V to 5.85 V over range of 3.5 to 4.0 40m 8.04V to 8.04V over range of 7.0 to 7.3 30m 2.505 to 2.973V over range of 10 to 10.15 20m 2.363 to 3.95V over range of 14 to 15 17m 3.113 to 3.310 over range of 18 to 18.2 15m 2.001 to 2.995 over range of 21 to 21.45 12m 3.90 to 4.26 over range of 24.8 to 25 10m 3.282 to 4.12 over range of 28 to 28.8 With the band switch set to 40m (7.000) TP1 reads 11348 Khz, rather than 11915, as discussed previously. TP3 reads 12094.35, and the range test passes (14.4 kHz). I guess it's not right that the VCO on 40m doesn't appear to change. Is that so? Am I heading in the right direction? Any pointers would be appreciated. Thanks Eric On Mon, May 9, 2016 at 11:57 PM, Don Wilhelm <[hidden email]> wrote: > Eric, > > That is indeed strange. > Go to the secondary menu and see if Squelch might be turned on. > I can't think of another reason at the moment. > > 73, > Don W3FPR > > > On 5/9/2016 10:56 PM, Eric Thielking wrote: > >> My K2 appears to have a receiver problem. Specifically, I don't hear any >> receive audio, unless navigating into the menu systems, at the 'OPT' >> section or the 'ATU' section. >> >> When those parts of the menu are active, receive audio can be heard. When >> one exists the menus, the audio falls off, and the s-meter indicates no >> apparent RF input. >> >> >> > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Eric,
Your problem seems to be with 40 meters alone. Do you have the K60XV option (or the Rework Eliminators) installed? If so, go to the secondary menu and check to see that the D19 menu parameter is set to "y". Without that option (or the Rework Eliminators), D19 should be "n". I suspect the Rework Eliminators are installed since your list of bands did not include 60 meters. If you did not build this K2, you might not know the answer. Look at the VFO area (near relays K13, K14 and K15) to see if D19 and D20 are installed - on K2s below SN3000 those varactors are mounted on the bottom of the board, remove the bottom cover to see them. If D19 and D20 are installed, do a 2nd check and find the value of C71 - it should be 120pF, and the D19 menu parameter must be set to "y". Without D19 and D20, the D19 menu must be set to "n". I surmise you have D19 and D20 installed and you did a Master Reset which leaves the D19 menu set to "n". If you did that reset, you will have to do not only a CAL PLL, but also a CAL FIL and set any menu items which pertain to installed options to the parameters which support those options. 73, Don W3FPR On 5/10/2016 4:12 PM, Eric Thielking wrote: > Don: > > Thanks for the help. The squelch is off. Taking the testing further, > it appears that the CAL PLL fails (Info 232) when connected into the > TP1 test port. The initial frequency I happen to see (when the test > starts) is 11348. > > I happened to read an older post about this subject, and went down > that road (as you had suggested). I have found the following results, > when trying various things, namely: > > 1. Voltage Controlled Oscillator Readings. > > 80m 2.243V to 5.85 V over range of 3.5 to 4.0 > 40m 8.04V to 8.04V over range of 7.0 to 7.3 > 30m 2.505 to 2.973V over range of 10 to 10.15 > 20m 2.363 to 3.95V over range of 14 to 15 > 17m 3.113 to 3.310 over range of 18 to 18.2 > 15m 2.001 to 2.995 over range of 21 to 21.45 > 12m 3.90 to 4.26 over range of 24.8 to 25 > 10m 3.282 to 4.12 over range of 28 to 28.8 > > With the band switch set to 40m (7.000) TP1 reads 11348 Khz, rather > than 11915, as discussed previously. TP3 reads 12094.35, and the range > test passes (14.4 kHz). > > I guess it's not right that the VCO on 40m doesn't appear to change. > Is that so? Am I heading in the right direction? Any pointers would > be appreciated. > > Thanks > Eric > > > > > > On Mon, May 9, 2016 at 11:57 PM, Don Wilhelm <[hidden email] > <mailto:[hidden email]>> wrote: > > Eric, > > That is indeed strange. > Go to the secondary menu and see if Squelch might be turned on. > I can't think of another reason at the moment. > > 73, > Don W3FPR > > > On 5/9/2016 10:56 PM, Eric Thielking wrote: > > My K2 appears to have a receiver problem. Specifically, I > don't hear any > receive audio, unless navigating into the menu systems, at the > 'OPT' > section or the 'ATU' section. > > When those parts of the menu are active, receive audio can be > heard. When > one exists the menus, the audio falls off, and the s-meter > indicates no > apparent RF input. > > > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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