Don Wilhelm-4 wrote > > Make certain that Q7 is working. Capacitor CA is one of the low pass > filter components that must be in the circuit on transmit. Q7 > effectively grounds one side of that capacitor on transmit. >
As I said in my original post, Q7 is the place where my DC troubleshooting measurements differed from specs. The base of Q7, which is supposed to be 0.7V, is -0.895V on 40 and -0.195 on 20. The voltage on Q7 should definitely be positive in order for it to ground capacitor CA, so something is screwy. Someone suggested that either C45 or C32 were possibly bad, allowing RF on to the base of Q7, which might cause the bogus voltages. I tried adding additional capacitance in parallel with C45/C32, but that had no effect. ----- 73, Stan - KR7C -- View this message in context: http://elecraft.365791.n2.nabble.com/New-KX1-low-power-and-20m-oscillation-tp7531133p7539677.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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
