[Elecraft] K3 Roofing Filter Gain Setup

[goldtr8 at charter.net]

Gents,

I am searching without much luck for recommendations for the gain 
setting recommendations for roofing filters.

Specfically I have a 700 hz 8 pole and a 200 hz filter 5 pole.   There 
is a gain setting in the k3 setup menue and I remember there were 
recomendations on how to choose this setting.  However, I have not been 
able to find reference on the net.

Please can anyone provide some guidance as the performance when these 
filters are engaged with digital modes is rather disapointing.    What I 
mean by this is that a signal can be very clean with the 2.7 or 2.1 
filter engaged but if  I use on of these filters the signal becomes very 
poor.  I want to use these to isolate close in signals but there appears 
to be a lot of distortation so they are basically of little use.

I am betting that there is more to this gain setting than meets the eye 
and that is where my problem is.  I have put the gain for these two 
filters at 1 and the 2.1 & 2.7 at zero.

I will be playing around with the settings, but there is a method to set 
this parameter so I need to learn what and why so I can make them work 
the way they are supposed to work.

Thanks and have a great holiday.

Don
KD8NNU