[BC] Frequency measurement...

[WFIFeng@aol.com]

In a message dated 03/22/2007 04:01:49 AM Eastern Standard Time, 
radiotech at bellsouth.net writes:

> 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.

I've used this technique to calibrate the PLL and/or reference oscillator(s) 
in various Ham transceivers, and you're right... it's not difficult at all!

Willie...





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