QST, Feb 1964, p. 141.
QST, Jan 1967, p. 131.
QST, Mar 1968, p. 114.
Note: "Compreamp" is the same name used by Metrodynamics for its similar device released in 1962. It is interesting to note that Waters added a trademark to its use of the word.
The Waters 359 Compreamp was a transistorized, battery-powered pre-amplifier/limiter. It increased transmitter output power up to four times while limiting over-modulation. It is a self-contained, battery powered, two stage transistorized audio amplifier/limiter designed to be used with all types of radio transmitters.
The Compreamp is connected between the station microphone (50,000 ohm dynamic or high impedance ceramic) and the transmitter microphone input connector. No wiring changes are required in the transmitter. Provision is made for switching the Compreamp in and out of the circuit, and for adjustment of the Compression Level. The Compreamp may also be used with tape recorders and public address system amplifiers to increase effective speech power and dynamic range.
Specifications
– Input Impedance: 100 K ohms (nominal)
– Input Level: .005 to .020 volts
– Gain (voltage): 10 db (minimum)
– Output Level: .060 volts
– Output Impedance: 50 K ohms (nominal)
Power Source: Standard 9 volt battery (NEDA 1604)
