[ARC5] BC-221 question

[Kenneth G. Gordon]

On 22 May 2020 at 20:42, Bill Cromwell wrote:

> Hi,
> 
> Ken Gordon who is a member of this list AND is dabbling in this thread 
> has a computer program to generate the cal book. If he still has it you 
> might find it on his webs site (assuming he still has it). Ken might 
> speak to that himself. If he no longer has it I am sure I have it in my 
> bitstash.

Yes. I believe I still have that program, but will have to look for it. I haven't used it in a long 
time. I first got it a long time ago.

Stand by....for a bit....I'll find it.

> graph paper. Now *THAT* was tedious. Later I found identical curves in 
> an obscure manual. By that time I already was wringing maximum 
> performance from that receiver. It worked exactly the opposite of the 
> recommendations in the ARRL Handbooks. No wonder they thought the single 
> xtal filter is not worthwhile. "Tedious" efforts can give nice rewards.

My best Elmer, Woody Davey W7CJB, found the same thing as you while working with an 
SP-600. He found that the Hammarlund way of aligning and using the crystal filter in that 
receiver was wrong, and when he got finished with it, it worked wonderfully.

Ken W7EKB