Note
QST, Sep 1973, p. 176.
QST, Mar 1974, p. 123.
QST, Feb 1975, p. 109.
QST, Jul 1975, p. 123.
QST, Jul 1976, p. 113.
QST, Jun 1977, p. 139.
Requires Swan 117CX power supply and speaker.
References
Brief description. Popular Electronics, Mar 1977, p. 9.