Ok Don, T7 is right way round, continuity seems good
Audio does increase when AGC turned off Unfortunately U12 output at pin 8 is much lower than pin4 with 0.14Vrms Ant input and RFgain at minimum 0.365Vrms at Pin4 0.025vRMS at Pin 8 changing to 0.151 when RF gain turned fully up. U12 DC Voltages seem ok. 1 7.74 2 7.74 3 0 4 0 5 4 6 2.467 7 0 8 7.73 73 Cliff VK2CCJ On Wed, Jan 30, 2013 at 1:27 PM, Don Wilhelm <[email protected]> wrote: > Cliff, > > When looking at the RF voltage after the IF filter, tune the K2 slowly > while looking for the peak RF voltage at U12 pin 4. > You will not be able to see the IF amplifier saturation with diodes D40 > and D41 in place - that information is prior to the introduction of those > diodes. > > T7 should be with the green winding closest to the crystal filter, the red > winding adjacent to pins 4 and 5 of U12. > Turn off the AGC (press PRE and REV buttons together) and see if the audio > level comes up. > You should have more RF voltage at U12 pin 8 than you do at U12 pin 4. > > 73, > Don W3FPR > > > On 1/29/2013 8:21 PM, Clifford Hynds wrote: > >> Still having issues with my K2, >> >> I did align the filters using the Spectrogram software so I believe they >> are ok >> >> Well I decided to start from scratch and started RX troubleshooting/signal >> tracing before I go back to TX side want to make sure the RX is 100% and >> while the stages up to the input of the crystal filter look ok the output >> compared to the manual is extremely low. >> >> I ended up using the RF probe supplied in the kit so all is known. >> >> Also removed the SSB board and fitted the corresponding jumpers at W2 and >> W3 and C167 >> >> Here is what i am seeing with a 0.14Vrms input to the antenna I used >> 10.1Mhz but I tried other bands with similar results. >> >> All voltages up to the input of the variable crystal filter look normal. >> >> Case or collector of Q22 = 2.3Vrms >> >> At W2 = ~ 2Vrms >> >> cathode D30 =0.89Vrms >> >> cathode D31 =0.95Vrms >> >> cathode D32 =0.757Vrms >> >> cathode D33 =0.767Vrms >> >> cathode D34 =0.735Vrms >> >> W3 = 0.080Vrms the K2 book on Page 11 says it should be about 0.34Vrms , >> I >> am way low compared to that. >> >> I suspect either D34 or T7 ? >> >> Also I don't appear to be able to saturate IF amp it says I should read >> approx 0.15Vrms at Pin 8 of U12 >> >> Am I on the right track. >> >> Thanks again, >> Cliff VK2CCJ >> ______________________________**______________________________**__ >> Elecraft mailing list >> Home: >> http://mailman.qth.net/**mailman/listinfo/elecraft<http://mailman.qth.net/mailman/listinfo/elecraft> >> Help: http://mailman.qth.net/mmfaq.**htm<http://mailman.qth.net/mmfaq.htm> >> Post: mailto:[email protected].**net <[email protected]> >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> >> > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
