Note
QST, Feb 1971, p. 107.
QST, Oct 1972, p. 145.
QST, Jul 1973, p. 146.
The Swan 210 was the outboard VFO for the 250C transceiver. It covered 6 meters in 500 kHz segments. A front panel switch split either transmit or receive frequency control with the 250C’s VFO, or used the 210 to control the transceiver.