For those who are ARRL members, they now have archives of QST on-line. I
stumbled across a two part series in the Sept and Oct 1952 QST ehtitled:
What Price Precision? The economics of Frequency Standards
By George X.M. Collier W0EG
The article highlights Crystal Charactgeristics,Hammarlund FS135C Standard,
Millen 90501 standards in part 1 then goes into building your own in part 2.
The ordinary ham could attain 1x10-7 on a 100kc standard!
A delightful look back....
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