Orban OPTIMOD-FM 5500 Operation Manual page 64

2-16
INSTALLATION
F) Press the N button.
EXT
G) Turn the knob to specify the week of the month when Standard Time begins.
6. Set pre-emphasis.
A) Press the Next button.
B) Select the pre-emphasis (either 75S or 50S) used in your country by turning
the knob.
7. Set external AGC mode.
Most of the 5500's processing structures control level with a preliminary AGC
(Automatic Gain Control). If you are using a suitable Automatic Gain Control at
the studio (such as an Orban 8200ST OPTIMOD-Studio or 464A Co-Operator), the
AGC in the 5500 should be defeated. This is so that the two AGCs do not "fight"
each other, and so they do not simultaneously increase gain, resulting in in-
creased noise.
A) Press the Next button.
B) Set external AGC mode by turning the knob.
 Set the field to Y
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 5500's AGC for all presets.
 Set the field to N
enables the 5500 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 5500 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 5500.
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
, not D
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.
[If you are setting up the 5500 for use as a stand-alone stereo encoder, skip this
step by pressing the Next button twice.]
if you have a external AGC (such as an Orban 6300,
ES
if you do not have a external AGC installed; this setting
O
.
NALOG
+J17, is appropriate for almost anyone using the digi-
IGITAL
ORBAN MODEL 5500
(so that
N
O
or
IGITAL