[ARC5] The BC-221 low frequency tank circuit puzzle.

[Roy Morgan]

On Feb 14, 2016, at 11:25 AM, Bruce Long <coolbrucelong at yahoo.com> wrote:

> ...10 ppm was about state of the art in the mid-30's ...
> During WW2 ...a few ppm ... was achieved only by introducing a common, standardized test set and doing round robin testing

Bruce,

I’d be interested to learn more about the standardized test set.  Are there articles or bits of history out there I can find?  I wonder if any of the MIT Radiation Laboratory series of books tells anything about this.

It may well be that General Radio produced a crystal test set or system to do this job (but if so, I have not heard of it).  They certainly did make frequency measurement systems of top notch capability.

Roy

Roy Morgan
k1lky68 at gmail.com
K1LKY Since 1958