Orban OPTIMOD-FM 8500S Operating Manual page 73

OPTIMOD-FM DIGITAL
1100V2, 1101, Orban 8200ST OPTIMOD-Studio, Orban 464A Co-Operator, or
similar AGC) installed at your studio feeding the studio-to-transmitter link.
This setting appropriately defeats the 8500S's AGC for all presets.
• Set the field to N
enables the 8500S AGC status to be determined by the selected preset.
• If you are using an Orban 4000 Transmission Limiter, set field to
the AGC function in the 8500S continues to work). The Orban 4000 is a
transmission system overload protection device; it is normally operated be-
low threshold. It is not designed to perform an AGC or gain-riding function,
and it cannot substitute for the AGC function in the 8500S.
8. Select your primary input (analog or digital).
A) Press the Next button.
B) If your main input source is digital, turn the knob to select D
+J17. Otherwise, select A
D
IGITAL
D
IGITAL
tal input. The only digital encoding that typically uses J.17 pre-emphasis
(of which we are aware) is NICAM.
9. Set operating levels.
You will set the operating levels of the 8500S to match the input levels it is re-
ceiving so the 8500S's AGC can operate in the range for which it was designed.
There are separate settings for the analog and digital inputs. If you provide both
analog and digital inputs to the 8500S, optimum adjustment is achieved when
the gain reduction meters show the same amount of processing for both analog
and digital inputs.
This will allow you to switch between analog and digital inputs without sudden
level changes.
A) Press the Next button.
B) Feed normal program material to the 8500S.
C) Play program material from your studio, peaking at normal program levels
(typically 0VU if your console uses VU meters).
D) [Skip this step if you are not using the analog input.]
Hold down the A
meter indicates an average of 10 dB gain reduction.
The procedure does not apply to the 8500S's stand-alone stereo encoder
mode. In this mode, the level indicated on the screen during this step is
the R.M.S. level (in dBu) of a 50 Hz input tone that produces 100% peak
modulation at the 8500S's composite output when the 8500S's C
L
IMITER
E) [Skip this step if you are not using the digital input.]
if you do not have a external AGC installed; this setting
O
NALOG
, not D +J17, is appropriate for almost anyone using the digi-
IGITAL
soft button and adjust the knob so that the AGC
NALOG
control is set to 0 or O
D
RIVE
.
.
FF
INSTALLATION
(so that
N
O
or
IGITAL
OMPOSITE
2-17