2-16
INSTALLATION ORBAN Model 8400
c) If you cannot defeat the STL transmitter’s pre-emphasis, place jumpers JE and
JF in the “FLAT” position.
C) Replace the top cover, then replace all screws snugly. (Be careful not to strip the
threads by fastening the screws too tightly.)
2. Install the 8200ST in the rack. Connect the 8200ST’s audio input and
output.
Refer to the 8200ST Operating Manual if you require information about instal-
lation, audio input and output connections to the 8200ST.
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 Fig. 2-4.) 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 transmit-
ter. If no significant overshoot occurs in the transmitter, the
MODULATION
meter will now give an accurate indication of peak modulation 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, 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.
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