My audio will distort and cut out as you describe if it's a very strong AM signal (nearly full scale on the s-meter) and the volume is turned up to that extreme. But that is really loud. I usually have the AF Gain set at 1/4 rotation or less, so don't really consider it a problem here. I never under any circumstance have to go up as far as 3/4 on the AF Gain (unless the AGC is off and the RF Gain is way down, in which case there is no distortion).
FWIW, you can set Config: AF GAIN to "HI" or "LO". The feel of my AF & RF controls are smooth. They have a very small side-to-side play but no bad wobble/looseness as you describe. When I rotate the RF Gain full CCW it is very quiet, just a very faint noise level can be heard with the AF Gain full CW. I consider it normal operation. 73, Drew AF2Z On Sat, 05 Dec 2009 20:50:25 -0800 (PST), you wrote: > >Hello, > >I am having a problem when I go into AM, or AM sync. Example: I go to an >AM Shortwave station. If I turn the AF gain past approximately 3/4 or >farther the radio starts to "Stutter, Distort, and finally the audio >disappears. I cannot make out what is coming out from my speaker. The >audio is completely distorted or gone. I noticed I could rotate the Af gain >(Counter Clockwise) and it would go back to less distortion. I did check >the external speaker jack and also unplugged it only to find the same >problem. > >The AF knob feels like it was one of those "old potentiometers" that we are >all aware of (Get scratchy after use and loose). From my understanding >Elecraft used extremely fine pots with a very long life (They do have a bad >wobble/looseness in them though). > >Upon further investigation I found that if I rotated the RF gain control >from the fully clockwise position (all the way open) to the full counter >clockwise position (all the way closed) that when you almost get to the end >of travel the radio audio goes completely dead. I have tried this multiples >times and it is very repeatable. > >After more investigation I found that if I rotated the "shift" (While in AM >or Sync AM) control from its standard (Normal) value of 1.50 to 1.55 this >horrible distortion would disappear? I am really confused as to what is >going on here. > >This happens while in the "Normal" AM mode as well as the "Sync" AM mode. > >I have tried to explain this in away that I hope most people will understand >my problem (I am not an EE). > >Could others please let me know if it is my unit or a wider problem? > >I am using 3.59 and the serial number is 283?. This unit was fully loaded >and built by Elecraft. > >Thanks, > >Rick ______________________________________________________________ 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
