Type A Amplitudemodulation Monitor

While operating 011 the same principle as previous models, the new Type 1931-A Modulation Monitor embodies a number of improvements.

Various circuit changes have been made to achieve greater dependability and accuracy, particularly in the flashing lamp circuit. The meter scales are illuminated and easily readable from across the transmitter room.

One new feature of considerable importance to users of high-fidelity transmitters is an additional detector circuit which provides a demodulator output with loss than 0.1% distortion. Measure

ments of audio distortion in the transmitter can be made by feeding this output to a Type 1932-A Distortion and Noise Meter or a Type 736-A Wave Analyzer. A low-impedance, 600-ohm

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