[BC] Frequency measurement...

[Alan Alsobrook]

I had a slightly different method for measuring frequency with an 
IFR-1000S. Its frequency error meter didn't have the resolution to see 
as close as needed for AM, so I had to figure out a different way. The 
easiest way I found (note this sounds far more complicated than it is) 
was to dial in the frequency 1000 Hz below the proper carrier frequency 
that I was to measure then turn on the BFO. This would give you a beat 
note of 1000 Hz +/- the error frequency. I would in turn beat that 
resulting tone against the precision audio oscillator. then simply read 
the frequency of the audio oscillator when I got the zero beat and 
subtract 1000. Doing this I was able to reliably measure the carrier 
frequency to 0.1Hz. In actual practice, with the way that box is set up 
that procedure only took less time than it took you to read this 
paragraph to complete.

Burt I. Weiner wrote:
> The sidebands removed 1000 Hz from the carrier might be somewhat in the 
> clear but the problem is you would also be measuring the error of the 
> 1000 Hz source.
> 
> Burt

-- 
Alan Alsobrook CSRE AMD CBNT
St. Augustine Fl. 32086 904-829-8885
aalso at Bellsouth.net