OPTIMOD INSTALLATION
2-15
3. Set 8200ST Output Level with tone.
A) Press the
TONE
button on the 8200ST.
The
TONE
lamp should light and the modulation meters should indicate “0.”
If they do not, re-strap jumpers JB and JC to “peak.” (Refer to Figure 2-5.)
The 8200ST is now producing a 400Hz sine wave at each output. The peak
level of this tone corresponds to 100% modulation.
B)
Adjust the
L OUT
and
R OUT
controls so that the STL transmitter is being driven
to 100% modulation.
The L OUT and R OUT controls are now correctly calibrated to the trans-
mitter. If no significant overshoot occurs in the transmitter, the
MODULATION meter will now give an accurate indication of peak modula-
tion of the STL.
C)
Turn off the tone by pressing the
TONE
button.
If the STL transmitter suffers from bounce or overshoot, you may have to
reduce the L OUT and R OUT control settings to avoid peak over-
modulation caused by overshoots on certain audio signals.
4. Set controls for normal operation with program material.
The following assumes that a VU meter is used to determine 8200ST line
drive levels with program material.
A) Set controls as follows:
HF LIMITER: Set to match the pre-emphasis of the transmission system
L OUT: Do not change
R OUT: Do not change
GATE: 12:00
RELEASE: 12:00
VOICE: OFF
AGC: ON
COUPLE: ON
B)
Feed the 8200ST either with tone at your system reference level (0VU), or with
typical program material at normal levels.
C) Adjust the
GAIN REDUCTION
control for the desired amount of gain reduction.
We recommend 8-15dB gain reduction for most formats.
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