[R-390] Mech filter REPAIR Lankford Trial?

[Cecil Acuff]

Dave and Group,

I don't remember this specifically but it may be that someone tried a 
commonly available 455 kc crystal filter module.

I do know that KIWA makes two different crystal filter modules that I 
believe would be good candidates....one has onboard amplification to allow 
impedance matching and compensation for insertion losses.  It was speculated 
that it would be a good modification to install in an SP-600.  I have 
planned for years to give that a try.  The other is just the passive filter 
adaptable to whatever application one would like to attempt.

They are priced very attractively as I remember....

Check out the following links... http://kiwa.com/errvw.html  & 
http://kiwa.com/kiwa455.html

Might be a good time to give this option a try!

Cecil....


----- Original Message ----- 
From: "Dave or Debbie Metz" <dmetz at ntelos.net>
To: <r-390 at mailman.qth.net>
Sent: Saturday, June 02, 2007 10:43 AM
Subject: RE: [R-390] Mech filter REPAIR Lankford Trial?


>A question for this esteemed group:  I seem to remember that in the HSN 
>newsletter a few years ago  Dr. Dallas Lankford did a test of using a 
>current filter available from one of the various electronic suppliers.  As 
>I recall, it wasn't perfect but was relatively  inexpensive.