[Elecraft] Mod for optimizing the crystal filter for narrower bandwidths

Tue May 27 06:04:00 2003

I wonder what the effect will be on the KSB2 from this mod?
As far as I can tell, the input to the KSB2 crystal filter will be
unchanged, but the output will be terminated in about 38 ohms instead of
150 ohms.

There is a posting in the archives
(http://www.ac6rm.net/mailarchive/html/elecraft-list/2000-07/msg00831.ht
ml) where AB7CE says that he could not tell any difference for the KSB2,
but I would be interested in hearing other opinions also. 

The archive also says:
At 04:50 PM 7/25/00 -0700, Eric Swartz WA6HHQ - Elecraft wrote:
>I'm editing the archive article now and will have it on the Mods page
in the
>next couple of days. ...
>We are editing the article to suggest how to do his mod without
>impacting the SSB board's filter.

Has anyone seen it?

73, 
Sverre

------------------
Sverre Holm, LA3ZA
www.qsl.net/la3za

> -----Original Message-----
> From: [email protected] 
> [mailto:[email protected]] On Behalf Of 
> Wolf-Ruediger Juergens
> Sent: 25. mai 2003 10:42
> 
> Hello OM's,
> I found an older email from Wayne describing a mod to get 
> constant filter 
> output even at the smallest bandwith. Also Peter, DL2FI, 
> mentioned to make this mod.
> This morning I wound 2 new toroids and applied this mod to my 
> K2. The result is ufb, even at 100Hz Filter setting the 
> amplitude of the signal is 
> nearly at a constant level.