Signal Substitution, Tuning Unit 4

74. Signal Substitution, Tuning Unit 4

panel controls on the test set as listed in

the chart below.

a. If. Chart (fig. 75 and 76). Use tuning

Note: The signal generator for tuning unit 4 is

u n i t 4 signal generator (para 65) with

provided with an internal modulating oscillator of

1,000-cps modulation. Allow tuning unit

1,000 cps only. If an equivalent signal generator is

4, the main unit, and tuning unit 4 signal

used in the following tests, the modulating voltage

generator to warm up for at least 1/2 hour

should be at a frequency within the audio range,

preferably 1,000 cps.

before starting the tests. Set the front-

b. If Test Procedure.

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