On 09-12-23 0:59 , Wes Stewart wrote: Wes
RF Gain calibration completed as per manual no problems seen in the calibration procedure. If in Config menu >>Smeter OF or other Smeters menus and I move the RF Gain the Smeter will respond as you would expect.(this is just a curious sidebar that is probably not useful info) In normal operation AGC OFF or ON S or F , PRE ON or OFF, ATT IN or OUT, ALL MODES ALL FITERS I get a gain increase in the main rcvr at the 9:30 position of the the main rf gain. Since the RF Gain calibration works for the sub reciever and the RF gain and S meter on the Sub rcvr work correctly I am beginning to suspect the JFET IF Amp and associated circuits of the main rcvr. Jim > Jim, > > You say that when you do the S-meter calibration the gain control > operates as you expect, but is somehow different otherwise. > > First, I hope you mean the rf gain calibration, which isn't > calibrating the S-meter but trying to compensate the ill-defined gain > v. volts curve of the JFET i-f amplifier. > > Nevertheless, after doing this, what are you changing that makes the > difference? Is the AGC is the same state, i.e. on or off both ways? > > Wes > > > > Hi > > Looking for some insight. > > K3 # 1189 > FW revs 3.68 > KAT3 > KBPF3 main reciever > KDVR3 > KIO3 > KPA3 > KRX3 > KXV3 > S-Meter in relative mode. > > The problem is with the main RF gain. If I turn down the Main RF > gain S > meter goes up as expected, the gain is heard to decrease and seen to > decrease by Spectrogram. So far so good. > > When I keep turning the gain down the S meter will increase to S > 30 (Rf > knob position 10 o'clock) When the knob position reaches 9:30 the > S meter > drops to S6 and the gain comes back up both heard and seen by > spectrogram. > Further movement will decrease the gain to zero as heard and seen > but the S > meter stays at S6. Increasing the gain the reverse happens. This > is true in > all modes. > > The sub acts normally as heard and seen by spectrogram and the > S-meter acts > as it should. > > I suspected the main encoder? I set both the sub and main to the > main RF > gain encoder. The main acts the same as before. I expected the sub > to act > like the main indicating an encoder problem but the Sub worked > exactly as it > should. > > During the Smeter calibration the main RF gain acted as it > should. Turning > down the gain the s meter goes up, gain goes down as expected with > smooth > movement no jumps or lags. > > What I have done twice so far without any improvement is > Fresh reload of firmware > Reset to Factory norms > RF Gain Calibration both main and Sub redone > S Meter reset using XG2 main and sub > > > What should I look at next I really thought it would be the encoder. > > Jim > VE3AJ > > ______________________________________________________________ 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
