Note
QST, Dec 1963, p. 145. (available in January 1964)
QST, Jan 1964, p. 137.
QST, Apr 1964, p. 114.
The Swan TCU provided separate transmit and receive frequency control when used with the SW-240. In addition, it gave full coverage of the 80 meter CW band, allowed 15 MHz WWV reception, and incorporated VOX operation for the SW-240.