5–3
Adjustments and Tests
Using a Modulation Monitor
1. Set the Stereo-Mono switch to Mono.
2. Check that the setting of the Modulation compensation control (see illustra-
tion 2–6) on the RF Exciter circuit board, falls within the range specified for
the frequency of operation. (See section 2.3.1.)
3. Feed a sine wave signal of about 2.5 kHz into the left channel at a level
sufficient to put the wideband gain-reduction indicator somewhere in the
middle of its range.
4. Set the Composite level control to produce 90% modulation as indicated on
an FM monitor.
5. Apply pink noise or program material to the audio inputs and confirm, on
both Mono and Stereo, that modulation peaks are between 95% and 100%.
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