[Elecraft] Fw: K2 Problem 30/20

[Glenn Haffly]

Subject: K2 Problem 30/20


> K2 # 4869 fully functional except 30/20 meters.
> An external signal generator on these bands will
> allow trimmers C21 and C23 to be peaked. A
> strong external signal is barely heard.
> Items that have been checked:
> #1 L18 , L19 , L20 rechecked for proper amount
> of turns and solder joints Ok.
> #2 All capacitors in the LP area are the correct part
> and solder joints Ok.
> #3 All capacitors in the band pass filter are the correct
> parts and no solder joints.
> #4 Relays K4 and K9 oriented correctly.
> #5 Using Don's past words check solder joints and are Ok.
> #6 The correct transformers used at L8 and L9.
> #7 Trimmer caps with red dots are at C21 and C23.
> Observations : Placing a finger under L8 increases noise levels
> and touching a screwdriver to one end of most of the caps in
> the 30/20 BP area also increase the noise level to a point where
> strong outside signals can be heard.
> Current plans are to use the signal generator at the antenna connector
> and try to see where signal stops.
> All other bands are good on Rx and Tx.
> Any suggestions would be welcome. 
> 
> Glenn
> K5ZE