Note
QST, Apr 1971, p. 127.
QST, Aug 1971, p. 111.
The S-20 Signalyzer plugged into a receiver or transceivers speaker or headphone connection. It equalized incoming signals to a consistent volume level. Input variations of up to 46 dB produced no more than 3 dB variation in audio output from the S-20’s speaker.
The S-30 was similar in all aspects to the S-20 Signalyzer, but included a built-in FR-4 filter.
