I've noticed a larger number of posts regarding low audio output with the K2. I'm sure there are various reasons for low audio. Such as wiring the speakers wrong etc.. Poor soldering etc. I have two K2's and both of them had to be hooked up to external amplified speakers in order to provide a comfortable room listening volume. Especially when the signal levels on the bands were very low. Per page 47 of the assembly manual, you set the AGC threshold by reading the voltage on Pin 5 of U2 and adj R1 for 3.8V (suggested setting that will be adjusted later to suit the operator). But there is nothing in the manual to indicate what AGC setting is best. Then I decided to search this forum regarding adjusting the AGC. Others were setting the AGC threshold by listening on a quite band and while turning the AGC on and off, adjust R1 for no difference in the received audio level. Turning the AGC on and off by holding down Pre/ATT and AGC simulaneously. Or you can use a program like Ham Radio Deluxe that provideds a single button to turn AGC on an off via software commands. After your done setting the AGC threshold, its necessary to re-adjust the S meter alignment. Others have said to hook your rig to a dummy load while adjusting the AGC in this way. I completed the AGC adjustments when 20M had a very low noise level during the evening hours. Now I have more than enough room filling vol without needing amp spkr's and typically run the audio around the 10 O'clock position. Others go to great lengths to say to adjust it with the Pre-amp off etc .... Since I never turn the Pre-amp off and I run the RF gain control at max at all times, its a non issue for me..... I'm sure each person has there own particular operating requirements. And have their own way to adjust the AGC that suits them. The way I did it, I cant be happier with the performance the K2 now. Room filling volumn using the internal speaker and the AGC still does the job on strong signals in a way that I'm happy with. Frank W7is _______________________________________________ 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
