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.... _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.