[Milsurplus] The BC-221N Freq Meter calibration.

[Bill Cromwell]

Hi Bob and all,

I have had only the LM series which is the same as the 221 only different;) The most important difference seems to be how it is spelled. I have used WWV here in The USA to check the calibration. All of the units I have had included the book with matching serial number and all were with a very few cycles. No adjustment needed.

I have a RAK receiver for having "calibration book" I used the spread sheet software to plot and graph a chart that turned out be very accurate. The curve of the chart is a slightly curved slope that matches the expected tuning curve. For the exercise I made a set of graphs the same way for an LM and it matched the tuning book. There is more than one way to skin a polecat.

73,

Bill  KU8H

> On Feb 4, 2024, at 3:03 PM, Bob Camp <kb8tq at n1k.org> wrote:
> 
> Hi
> 
> Based on the one example I’ve played with, the original BC-221 / LM calibration setup used the best frequency standard then available. I’d suggest that a high quality / calibrated standard would need to be part of doing this as well. 
> 
> Bob
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