[Elecraft] RF gain sweet spot

[Geoffrey Mackenzie-Kennedy]

Ed,

If you switch between different roofing filters, does the "sweet spot" occur 
at the same position of the "RF" Gain control knob or does it change? Also 
does the noise / S meter dip by the same amount regardless of which filter 
is in use, if not does the depth of dip increase or decrease when switching 
from a wide bandwidth roofer to a narrow bandwidth roofer?

On another reflector there has been some discussion about "pileup mush" 
which has been reported by only a small number of K3 owners, which problem 
IMHO could well be caused by some roofers and the termination presented to 
their output.  Your observations of a "sweet spot" *might* be related.

73,
Geoff
GM4ESD
(who must leave the List tomorrow!)


On July 21, 2011 at 22:52 Z, Ed K7WIA wrote:



>I don't know but I like it this way,   as my noise floor changes through 
>the
> day I do have to readjust the sweet spot,  but it is just a very small 
> turn
> of the RF knob....
> I checked this with the noise blanker on and off and I see the same 
> effect,
> it's just with the blanker off I can only reduce it to 2 bars on the 
> meter.
> could be I got a special K3..
>
> Ed K7WIA