Note
QST, Nov 1958, insert
QST, Jan 1964, p. 161.
QST, Jan 1965, p. 129.
Collins product catalog, 16M-CR-12-74
QST, Jun 1976, p. 2. (516F-2)
QST, Feb 1977, p. 117.
The 516F-4 looks like it should include a speaker, but as delivered from the factory, it did not. There is room enough inside, however, and some users did add a speaker.
