[Elecraft] Scratchy Pot Syndrome

Ron D'Eau Claire [email protected]
Tue Aug 27 19:32:01 2002


Before getting starting this fall on the KPA100, I've wanted to install
the 
scratchy pot mod to get that out of the way first. ... In other words,
can the pc board 
be separated by only removing the knobs and encoder hardware without
removing 
these wires?  ... I'm wondering if the overall gain 
is going to be negatively impacted?  .

Frank, W4FMS
K2 #1608
_______________________________________________

It's been a long time since I made the mod, but I'm quite sure that you
do not have to remove the encoder. You simply remove the nut that holds
it to the front panel and the encoder is held by the short leads to the
board while you do the work on the board. 

The total gain of the K2 is NOT affected by the mod. What happens is
that the behavior of the volume control takes on a logarithmic
characteristic. That is, the gain increases more slowly at the lower end
of the range and then increases more rapidly as you approach the higher
end of the range. That way it SOUNDS to your ear like the control is
more "linear" because the sensitivity of your ear to the change in level
is also logarithmic.

The maximum noise your K2 will make is not changed. 

Ron AC7AC
K2 # 1289