[Milsurplus] BC-221 questions Calibrate the crystal reference?

[John Hutchins]

Group -

Noted on this WEB page:
http://www.qsl.net/ve3bdb/bc221observations.htm
*"Accuracy of the crystal oscillator was checked at the 7,333.3 KHz 
calibration point."

Cannot find reference in TM to using this as a calibration reference?

What did I miss?

Thanks
Hutch

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