[Hammarlund] Mechanical filter for SP-600?

[Cecil Acuff]

I know of a cost effective alternative.  I haven't tried it yet but Kiwa 
makes a completely self contained high performance crystal filter module. 
One has no active components and the other has some high quality 
amplification on board that allows zero insertion loss.  It is not sensitive 
to input impedance and best I remember has the proper output impedance.  It 
is even suggested in some literature where a test was performed on the 
amplified filter module that it would be well suited to the SP-600.  I'll 
have to look up where I read that...I think it was in one of the later 
Proceedings publications.

I have wanted to give it a try but have not gotten around to doing it.

Maybe one day!

Cecil...
----- Original Message ----- 
From: "Craig Roberts" <crgrbrts at verizon.net>
To: "Hammarlund" <hammarlund at mailman.qth.net>
Sent: Friday, January 14, 2005 3:55 PM
Subject: Re: [Hammarlund] Mechanical filter for SP-600?


> Bruce Sugarberg wrote:
>
> "I believe Collins offered one (a mechanical filter adapter).  (It was) a 
> very small box that  contained the filter and a tube, and replaced the 1st 
> IF tube...."
>
> Thanks Bruce. The reason I asked is because I ran across a web page that 
> contains plans from G. E. Ham News of March-April 1957 for just what you 
> described. It looks like it might be adaptable to the SP-600 and might be 
> fun to try (though the price of mechanical filters takes a little of the 
> fun out of it).
>
> Thanks again & 73,
>
> Craig
> W3CRR
> www.aerialacts.com
>
>>
>>
>
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