> Don and all
I did carefully removed L33 and both crystals. Replace L33 but with room to solder both crystals on the solder side. When solder 1 crystal at the time they both give the wanted reading and they are stable. But when both are solderd its jumping around. > > > My guess is that there is a bad solder connection somewhere in the BFO area. > The fact that things stabilize when you touch something in the area strongly > suggests something wrong with the soldering. > > Pressing BAND+, BAND- when in CAL FCTR should swing the voltage between 0 > and 8 volts, so it seems things are likely OK with the control voltage. > > The only other thing I can think of which would cause similar behavior is a > weak crystal. If you suspect the crystals, try removing one of them and see > if the behavior stabilizes (the BFO range will become more narrow - so that > is only for a test, not a cure). 2 parallel crystals are used to 'de-Q' the > crystals and provide a greater BFO range than one alone would provide. > > 73, > Don W3FPR > > ----- Original Message ----- > > > Some ask for more info. > > > > With the probe in TP2 and CALL on FCTR the reading jumps fast around 4.620 > > mc > > Then the voltage on RP6 is stable reading 6,48V > > > > Pressing BAND - > > The readout is 4,917 mc and stable but the voltage on RP6 has jumped to > > 8,0V > > > >> > >> I have a K2 rig here for repair and this baby has a instable frequentie > >> reading on TP2 > >> After touching a part of the bfo its solid (4,917 mc) > >> Q24 is working good, but on U11 (bfo) pin 6 and 7 are 1 volt too low. > >> I a have all ready replace D37 and D38 bun no effect. > >> > >> Question. Why are there 2 cristals? (X3 and X4) > >> The low voltage on pin6 and 7 of U11 is this caused by a defect IC or > >> something else? > >> > >> Peter > >> PC2A > >> > > > > > > _______________________________________________ > > Elecraft mailing list > > Post to: [email protected] > > 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: [email protected] 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
