[Elecraft] Another one of those filter questions

[G4GNX]

Thanks for all the replies guys, much appreciated.

I will do a quick "by ear" setup for the time being and a more scientific 
setup with instruments, when I have a little more time.

73,

Alan. G4GNX

-----Original Message----- 
From: Vic Rosenthal 4X6GP/K2VCO
Sent: Thursday, July 16, 2015 2:02 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Another one of those filter questions

You are correct that the offset is zero for 8-pole filters.

What I do is adjust the filter gains so that there will be no change in
signal strength when switching filters. You can do this by ear if you
turn off the AGC, or you can use the K3's DBV function if you are a
perfectionist.

I found -- and you may get very different results -- that the following
gain values were about right for my filter complement:

2.8 kHz  0 dB
1.0 kHz  1 dB
400 Hz   5 dB
200 Hz   6 dB

73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/

On 16 Jul 2015 11:19, G4GNX wrote:
> I purchased a 400Hz 8 pole (Inrad) filter and installed it in my K3 
> yesterday.
> There were no markings on the box and some obscure numbers on a small 
> label on the side of the filter case, but there was no offset figure.
> The Cady book mentions that for 8 pole filters an offset is unnecessary, 
> so I presume this is correct?
> It also mentions adding a small gain figure of 1 or 2, what do others 
> normally do for a CW filter?
>
> 73,
>
> Alan. G4GNX
>
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