Hi Richard, How is your RX EQ set?
What you describe sounds like DAC stages maxing out on too much low (near DC) frequency content. DC uses all bits and mutes DAC. Turning down the lower RX EQ bands might help. 73' Paul PD0PSB Richard Jones - KJ5QY 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 > -- View this message in context: http://n2.nabble.com/K3-Distorted-Sound-while-using-AM-tp4120316p4120804.html Sent from the [K3] mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
