Orban OPTIMOD 6200, Operating Manual

Page: 65 / 195

OPTIMOD INSTALLATION
2-23
System Setup
For the following adjustments, use the soft keys to select parameters. While
holding down the appropriate soft key, use the front panel control knob to ad-
just the parameter settings, as desired.
If a parameter is not visible and the
Next
and
Prev
buttons are flashing, use
these buttons to scroll horizontally to access the desired parameter.
Use the
Contrast
knob to adjust the display for best clarity.
1. Press Setup button to access Setup screen.
A) Press the Next button to access miscellaneous Setup parameters.
2. Set the MAX LPF frequency as appropriate to your application.
[4.0 kHz] to [20.0 kHz]
The 6200’s audio bandwidth can be set in three places: (1) in Setup, (2) in the
EQ page of the Modify screen, and (3) by remote control. The 6200’s band-
width is always the lowest of these three settings. The frequency in Setup is a
technical parameter that determines the highest bandwidth available. The in-
stalling engineer should set it to be congruent with the sample rate of the digi-
tal system being driven by the 6200. For example, if the 6200 is driving a sys-
tem with a 32kHz sample rate, set the
MAX LPF
to
15.0 kHz
. That way, a setting
of 20kHz elsewhere will not cause excessive bandwidth and aliasing because
the 6200 will automatically override it with the
MAX LPF
setting.
3. Set the ST CHASSIS mode as appropriate for your installation.
[yes] or [no]
This control tells the 6200 if you have a studio chassis (such as an Orban
8200ST OPTIMOD-Studio, Orban 464A Co-Operator, or similar AGC) in-
stalled at your studio feeding the studio-to-transmitter link. Setting
ST
CHASSIS
to
yes
defeats the 6200’s AGC.
Most of the processing structures in the 6200 control level with a prelimi-
nary 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 6200 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 increased noise.
If you are using an Orban 4000 Transmission Limiter, answer no to the
question (so that the AGC function in the 6200 continues to work). The
Orban 4000 is a transmission system overload protection device; it is nor-
mally operated below threshold. It is not designed to perform an AGC or
gain-riding function, and it cannot substitute for the AGC function in the
6200.