RV-4C REMOTE VFO The RV-4C is designed for use with the TR-3, TR-4 and TR-4C transceivers. It permits reception, transmission, or both transmission and reception on a frequency removed from the VFO setting of the transceiver, but in the same band to which the transceiver is tuned. The RV-4C consists of a highly stable permeability-tuned solid-state VFO, a cathode follower, associated control circuitry and a 5-inch 4 Ohm speaker. The unit is housed in a cabinet which matches the transceiver. An AC-4 (or AC-3) power supply can also be housed in this cabinet. The dimensions are as follows: 5-3/8 inches high, 10-3/4 inches wide and 11-l/8 inches deep. Weight is 6-l/2 lbs.