Orban OPTIMOD-FM 8700, Operating Manual

Page: 93 / 390

OPTIMOD-FM DIGITAL INSTALLATION
2-31
D) Calibrate using Tone.
[Skip this step if you are using program material to calibrate the 8700i to
your standard studio level. Skip to step (E).]
a) Verify
E
XTERNAL
AGC
is set to
NO
.
Refer to step 1 on page 2-27 above.
b) Feed a tone at your reference level to the 8700i
If you are not using an external AGC, feed a tone through your console at normal pro-
gram levels (typically 0VU if your console uses VU meters).
If you are using an Orban 4000 Transmission Limiter, press its two TEST buttons. Feed
a tone through your console at the level to which you normally peak program material
(typically 0VU if your console uses VU meters).
If you are using a Studio Level Controller that performs an AGC function, such as an
Orban 8200ST OPTIMOD-Studio or 464A, adjust it for normal operation.
c) Adjust the
R
EFERENCE
L
EVEL
to make the 8700i’s
AGC
meters indicate 10 dB
gain reduction.
d) When finished, reset
E
XTERNAL
AGC
to
Y
ES
, if required (e.g., if that was its
setting prior to setting
R
EFERENCE
L
EVEL
).
e) Skip to step 6.
E) Calibrate using Program.
[Skip this step if you are using tone to calibrate the 8700i to your stand-
ard studio level—see step (D) above.]
a) Verify E
XTERNAL
AGC is set to N
O
.
Refer to step 1 on page 2-27 above.
b) Feed normal Program material to the 8700i
Play program material from your studio, peaking at the level to which
you normally peak program material (typically 0VU if your console uses
VU meters).
c) Adjust the
R
EFERENCE
L
EVEL
to make the 8700i’s
AGC
meters indicate an
average of 10 dB gain reduction when the console’s VU or PPM is peaking
at its normal level.
If the AGC gain reduction meter averages less than 10 dB gain reduction (higher on the
meter), set the
R
EFERENCE
L
EVEL
to a lower level.
If the AGC gain reduction meter averages more gain reduction (lower on the meter),
set the
R
EFERENCE
L
EVEL
to a higher level.
d) When finished, reset
E
XTERNAL
AGC
to
YES
, if required (e.g., if that was its
setting prior to setting the
R
EFERENCE
L
EVEL
).
6. Adjust the Analog Input’s Right Channel Balance.
[Skip this step if the channels are already satisfactorily balanced.]