Orban OPTIMOD-FM 8500S Operating Manual page 70

2-14
INSTALLATION
D) If you cannot defeat the STL transmitter's pre-emphasis, place jumpers JE and
JF in the F position.
LAT
E) Replace the top cover, and then replace all screws snugly. (Be careful not to
strip the threads by fastening the screws too tightly.)
If the STL transmitter suffers from bounce or overshoot, you may have to
reduce the
L O
modulation caused by overshoots on certain audio signals.
2. Install the 8200ST in the rack. Connect the 8200ST's audio input and out-
put.
Refer to the 8200ST Operating Manual if you require information about installa-
tion, audio input, and audio 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 Figure
2-4 on page 2-13.)
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 8200ST's L O
ing driven to 100% modulation.
The and
L O R O
UT
ter. If no significant overshoot occurs in the transmitter, the
meter will now give an accurate indication of peak modulation of the
STL.
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) Turn off the tone by pressing the T
B) Set controls as follows:
HF LIMITER... Set to match the pre-emphasis of the transmission system
L&R Out ................................................................................do not change
GATE .................................................................................................... 12:00
RELEASE ............................................................................................... 12:00
VOICE ......................................................................................................OFF
AGC ..........................................................................................................ON
COUPLE ....................................................................................................ON
C) Feed the 8200ST either with tone at your system reference level (0VU), or with
typical program material at normal levels.
and control settings to avoid peak over-
R O
UT UT
and R O controls so that the STL transmitter is be-
UT UT
controls are now correctly calibrated to the transmit-
UT
ONE
button.
ORBAN MODEL
MODULATION