[AMRadio] SP-600 IF Bandwith Specification

Mike Sawyer w3slk at uplink.net
Sun Oct 1 22:58:52 EDT 2006

I'm not sure Jim. I never open it up. It plays fair, but I would have 
expected better from Collins. I have heard there are some modifications out 
there to open it up (one involves a L-C network where the filters go). Maybe 
I just have my expectations too high. It has been reworked by W3HM, but 
somehow he never re-installed the crystal calibrator nor has he found it.
----- Original Message ----- 
From: "Jim Wilhite" <w5jo at brightok.net>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Sunday, October 01, 2006 10:37 PM
Subject: Re: [AMRadio] SP-600 IF Bandwith Specification

Hey Mike, are you sure the filter is good?  Sometimes they develop problems
after many years.   Me thinks they had some sort of foam in them to help
prevent movement of the discs and it can deteriorate.

73  Jim

> I'm curious, how well these filters would work in lieu of the Collins
> filters? I have a 75A3 with just the 3.2 Kcs mechanical filter and it just
> plain sucks. Maybe if it had something along the lines of a 5.5~6.0 Kcs
> might make it a little more tolerable.
> Mod-U-Lator,
> Mike(y)

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