FIG

- CONTROLLED-CARRIER CIRCUIT FOR lOOO-VOLT TUBES (W2HLM)

Adjustment of Plate-Modulated Amplifiers

• After the audio section of the transmitter, including the modulator, has been checked for specified output with good quality (say with a fixed resistance equal to the specified load value across the modulator output transformer secondary), the r.f. stage should be adjusted to present the proper load to the modulator output. All transmitter testing excepting final tuning of the antenna circuit should be carried should be taken from the modulator output circuit to avoid phase difference between the modulation applied to the carrier and the audio signal applied to the oscilloscope. Such phase shift gives patterns which are difficult to interpret.

FIG. 1217 — SKETCHES OF TYPICAL TRAPEZOIDAL FIGURES REPRESENTING VARIOUS OPERATING

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