[Elecraft] K3 Roofing Filter Gain Setup

[Matt Zilmer]

From D9 Owner's Manual (may be downrev at this point), p49:

Use VFO A to set the gain in dB. In general,
you’ll want to add 1-2 dB for 400-500 Hz
filters, and 3-4 dB for 200-250 Hz filters.

I left the 1.8, 2.8, 6 and 13K filters alone.  The 250 Hz I have set
for 3 dB gain.

matt W6NIA

--
On Sat, 28 May 2011 15:17:23 -0400 (EDT), you wrote:

>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
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