Optimod-AM 9400 V1.2 Operating Manual - Orban

OPTIMOD-AM DIGITAL INSTALLATION 2-5
8. Install Monitor Rolloff Filter. (optional)
Orban Monitor Rolloff Filters are accessories that can be ordered from your authorized
Orban Broadcast Dealer. The Orban model number is MRF-023.
The Orban Monitor Rolloff Filter alters the flat response typical of a modulation
monitor's audio output to one that more closely resembles that of an actual AM
receiver. It is a passive filter, requiring no power supply. Its metal flange is drilled
such that it can be mounted to one rail of a standard rack. (See page 1-23 for
more about studio monitoring.)
A) Select rolloff response.
The Monitor Rolloff Filter is supplied jumpered for NRSC WITH 10 KHZ
NOTCH, unless otherwise noted.
NRSC with 10 kHz NOTCH
Accurately simulates the sound of a standard NRSC receiver. Also useful
for remote off-air monitoring because it filters out the 10 kHz whistles
caused by interfering first-adjacent stations (in countries with 10 kHz
channel spacing). Intended to complement the HF CURVE NRSC setting
in OPTIMOD-AM.
Note that very few real radios have a frequency response resembling the
NRSC standard. Therefore, the NRSC rolloff will result in substantially
brighter sound than most radios provide, and the 18dB/OCTAVE setting
provides a more realistic simulation of a typical radio.
NRSC: NRSC rolloff without 10 kHz notch.
18dB/OCTAVE
Simulates the sound of an average narrowband AM/MW receiver except
that it shelves off above 6 kHz instead of continuing to rolloff as a real
radio would. This rolloff complements an HF CURVE setting of 0 in
Figure 2-4: Jumper Positions, Monitor Roll-Off Filter