Note
QST, Nov 1971, p. 160. (sometime before this)
QST, Apr 1972, p. 160.
QST, Dec 1975, p. 149.
The RV-4 remote VFO controlled the transmit, receive, or transceive frequency of the TR-4. It could also be switched offline, returning control to the TR-4’s PTO. The RV-4 was solid-state with the exception of a VR tube and cathode follower.
RV-4C
Date assumed to be 1972 -- matching the release of the TR-4C.
QST, Jan 1976, p. 91.
QST, Mar 1976, p. 113.
QST, Dec 1977, p. 155.
