Note
QST, Dec 1958, p. 188.
QST, Apr 1959, p. 170, 175.
QST, Mar 1961, p. 110.
QST, Oct 1962, p. 139.
The P&H compressor-amplifier worked on both transmit and receive. It installed in the microphone line of a phone transmitter and prevented over-modulation by using broadcast-type compression. The AFC-2 also applied compression and band-pass filtering to received signals. It had a built-in power supply.
