7DEOH-'LJLWDO03;
Facilities are self-explanatory, except for the following:
The TONE LVL control is calibrated under the assumption that the stereo pilot tone contributes 9% to the total
modulation. Hence, a TONE LVL setting of 91% produces 100% modulation (91% + 9%).
Note that when the OPTIMOD is in TONE mode and its analog or digital L/R outputs are set to FLAT (instead of PRE-
EMPH), these outputs apply 50μs or 75μs deemphasis to the output of the tone oscillator. Applying deemphasis this
way is only correct if equipment downstream from the OPTIMOD, like a transmitter’s stereo encoder, applies
preemphasis before final transmission.
In B
YPASS mode, preemphasis is still applied to the signal path. The BYPASS GAIN control calibration allows enough
internal headroom to make swept frequency response measurements without internal clipping. When the BYPASS
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