Folks, I would add to what Ron said that the AGC Threshold setting also has a great influence on the S-meter.
It is possible to 'twiddle' with the AGC Threshold pot, CAL S Lo and CAL S Hi settings to obtain most any S-meter reading you want. CAL S Hi alone can be adjusted to produce the S-9 at 50 uV indication, but when doing only that, the s-meter range can be constricted or expanded if the other settings are not correct, resulting in an S-meter that is correct only at S-9. I usually adjust the AGC Threshold just below the point where there is no change between AGC on/off (no antenna connected) - the voltage will be somewhere between 3.65 and 3.8 volts. Then set CAL S Lo for no bars showing (RF GAIN set full clockwise and no antenna connected) Then set CAL S Hi for last bar lighted with RF GAIN at minimum. Checks with a 50 uV signal afterwards usually produces an indication of S-9 +/- 1 LED bar for me. If I want it any closer, I set the AGC Threshold up or down by a small amount (measure the voltage and move it only a small voltage at a time - 0.05 volt to 0.1 volt steps only), then re-do the CAL S Lo and CAL S-Hi - repeat until the desired S-meter readings are obtained. A bit more involved that the simplified steps in the manual, but then if you want precise results you have to work at it a bit harder. 73, Don W3FPR > -----Original Message----- > ... > Set your GR-1390B for 50 uv output and adjust the S-meter MENU settings on > your K2 for S-9. > > It's also useful for Spectrogram adjustments, just like the > Elecraft N-Gen. > > Ron AC7AC > > -----Original Message----- > Hi Elecrafters, > I've been given some old instruments, among them a GR1390-B > random noise > generator : > - Maybe it could be of some help for S-meter calibration of my K2? > - Or for something else in the radio field ? > 72, > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
