Mike Tuggle has an excellent article on this subject in the Antique Wireless Association's on-line archives of the "Old Timer's Bulletin. " Here's the link: http://www.antiquewireless.org/otb/dxxtal.htm
The link for the Antique Wireless archive (another treasure trove for us) is:
http://www.antiquewireless.org/otb/archive.htm
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