[ARC5] BC-221 and LM calibration book

[Bill Cromwell]

Hi Ken,

While I was looking for info about the xtals for these I found the 
software I got from you. I will keep mine as a backup. In fact I 
probably have it on a backup disc CD and DVD) here too.

73,

Bill  KU8H

On 5/23/20 12:38 AM, Kenneth G. Gordon wrote:
> On 23 May 2020 at 0:25, Roy Morgan wrote:
> 
>> Ken,
>> 
>> If you don’t find it I have it here.  There were updates from the original one Bob Keys wrote.
> 
> Hi, Roy: I found it, but I don't know if it contains the updates you 
> mention.
> 
> Also, I attempted to run the .EXE file on my WIn10 box and was told, 
> rather bluntly, that it would not run there. I have an XP-Pro box I'll 
> try next.
> 
> My versions were published by Russ Schroeder  W2DYY dated 9 Feb 96
> 
> Is that the one you have, or is mine older than yours?
> 
> BTW, Russ' notes include the followng:
> 
> "The calibration book you generate will not be as accurate as an original
> book.  However, the maximum error in the HF range should be less the 0.5 kc
> at the ends of the range.  The maximim error in the LF range should be less
> than 50 cycles at the ends of the range. This error is due to a small
> nonlinearity in the capacitor manufacture."
> 
>> I have both an SP-600 (not nearby but safe) and a BC-779 (here), so I
>> would like to collect full details on this crystal filter problem. 
> 
> I'm sorry, Roy, but I don't have the details on what Woody discovered 
> about the filter.
> 
> I DO remember, vividly, that he told me that if the filter is aligned 
> correctly, as you reduce the bandwidth, the signal level should rise on 
> the S-meter, NOT get weaker, since the S/N ratio is increased.
> 
> I also remember that it took him some weeks to get what he expected and 
> that he was very happy when it finally worked as he thought it should.
> 
> This was at least 50 years ago, so I don't remember much about it.
> 
> Ken W7EKB
> 
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