Optimod-AM 9400 V1.2 Operating Manual - Orban

2-28
INSTALLATION ORBAN MODEL 9400
filter cutoff frequency. By making the transition between the passband and
stopband progressively more rounded and gentle, each step trades off duller
sound against less ringing. See Figure 2-8.
D) Hold down the soft key under HIGHPASS AND Select the highpass filter cutoff
frequency you need by turning the knob.
OPTIMOD-AM can be programmed for any highpass filter cutoff frequency
from 50 to 100Hz in 10Hz steps. Default is 50 Hz. See the text in
step (6.B) on page 2-18 for guidance on where to set the frequency. Refer
to the text in step (B) on page 2-26 regarding global system settings
vs. setting in presets.
E) Set the lowpass and highpass filter cutoff frequencies for any other Transmission
Presets you will be using. Note that each preset has an independent setting
for lowpass cutoff, lowpass shape, highpass cutoff, and asymmetry.
a) Press ESC.
b) Press the soft key labeled with the transmission preset you wish to adjust.
c) Adjust the filter frequencies as you did in the steps above.
8. Configure analog output(s).
[Skip this step if you will not be using the analog output(s).]
A) Navigate to SETUP > IO CALIB > OUTPUT > ANALOG1.
If necessary, use the NEXT button to scroll horizontally.
B) Set the SOURCE to AM PROC, HD PROC, or MONITOR.
AM PROC feeds the selected output with the output of the processing
chain for analog AM transmitters. HD PROC feeds the selected output
with the output of the processing chain for HD Radio or other digital
transmission channels like netcasts.
C) Set the LOAD control to BRIDGING or 600 OHMS. The normal setting is BRIDGING.
Only set this control to 600 OHMS if your transmitter has been verified to have
a 600-ohm input impedance.
Functionally, the control increases the output level by 4.0 dB when the
control is changed from BRIDGING to 600 OHM. This compensates for the 4
dB loss in the 9400’s EMI filtering network when this network is loaded
by 600 ohms.
If you are using Analog Output #2, navigate to Navigate to SETUP > IO
CALIB > OUTPUT > ANALOG2 and repeat this step.
9. Configure digital output(s).
[Skip this step if you will not be using the digital output(s).]
A) Navigate to SETUP > IO CALIB > OUTPUT > DIGITAL1.
If necessary, use the NEXT button to scroll horizontally.
B) Set the SOURCE to AM PROC, HD PROC, or MONITOR.