Paul, You are correct, there is no well defined procedure, and part of the real procedure depends on 1)whether you set the pre-amp on or off, 2) the band that you use to optimize the AGC, and 3) the sensation in your ears as you listen to the result - An AGC Threshold setting that is higher than necessary will tend to reduce the gain of your receiver even with no signal present, and the AGC Threshold adjustment can be used to avoid that condition.
Here is how I do it: Do this adjustment only after the reciever is fully built and aligned. Set the receiver to 40 meters, the PreAmp OFF, CW mode, Bandwidth at 700 Hz, and be certain the RF Gain is at the full clockwise rotation. Listen to the reciever noise (use a speaker and turn the audio gain up a bit high). Turn the AGC alternately ON and then OFF (press PRE/ATT and AGC buttons together) while listening to the noise level. Lower the AGC Threshold voltage gradually while doing that - when the AGC ON noise is just a tiny bit less than the AGC OFF noise, you have found the proper point. Go no lower than 3.6 volts or you may likely have trouble with the S-meter limits that must be adjusted afterward. Do CAL S Lo and CAL S HI (in that order) as instructed in the manual - go through this adjustment cycle a couple times and double check with the wide filters (SSB OP1 filter if installed). If you use the XG1 or XG2 to check the S-9 level, you may have to make some compromises in the CAL S Hi setting to get the S-meter readings satisfactory to your eyes and ears - there are no exact requirements, it is all in the S-meter action that you want to see, so set it as you like - the K2 receiving performance is not changed by the CAL S Hi and CAL S Lo, only the s-meter readings change. 73, Don W3FPR > -----Original Message----- > > What is the proper way to set AGC in the K2? > The manual suggests adjusting R1 for 3.80V at U2-5 as a starting > point, but > then gives no other information. > > TNX, > Paul N8NOV > Houston > _______________________________________________ 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
