Post #4 from David makes several references to phase meters. Clearly they can be very useful. But then why does one see so few references to, and articles about, them?
I recall their being mention of them by Pappenfus et al in the book "Single Sideband Principles and Circuits", McGraw Hill, ca. 1964. This is one of the excellent books written by Collins staff. Collins used phase meters in some of their ATU's. There was a mention in Technical Topics in the August 1989 issue of Radcom. And G3YNH has included them in his discussions on his web site at
http://g3ynh.info and his section on the G3GFC M50 Match meter at
http://g3ynh.info/zdocs/m50/index.html
Does anybody know of good articles on phase meters for HF use?
Thanks and 73
John