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nstallation and Operation nstructions
RETROF T K T RET-041
For OPT MOD-AM Model 9100A/1 (mono)
Purpose: Adds NRSC Pre-emphasis and 10kHz Low-pass Filter
Retrofit Kit RET-033 must first be installed in units
with serial numbers below 700000.)
This kit modifies the Model 9100A/1 OPTIMOD-AM® to provide the pre-emphasis and
1 0kHz low-pass filtering that is recommended by the National Radio Systems Commit
tee NRSC). 12kHz and 5kHz low-pass filtering are provided for stations that require
them. The filters can be preset, or can be switched by OPTIMOD-AM ' s day/night logic.
This kit also provides a means of de-emphasizing the NRSC pre-emphasized signal for
monitoring.
Retrofit Kit RET-041 contains:
1
Card#1F10
1
BLUE NRSC Pre-emphasis Module
2
30-gauge wires
1
Label, " Special Modification"
1
Resistor, 100Q ±5%, 1 / 4 -watt, carbon film
2
Resistors, 620Q ±5%, 1 / 4 -watt, carbon film
1
Capacitor, 0.1 8pF ±5%, 1 0O-volt, metallized polyester
1
NRSC Compliance Card
1
Installation and Operation Instructions
These instructions first discuss the reasons behind the NRSC recommendations starting
on the following page), then explain how to install the retrofit on page 3).
Installation consists of positioning jumpers, setting controls, plugging a pre-emphasis
module into a socket, and inserting a new circuit card into a rack slot. A simple de
emphasis circuit can be installed for off-air monitoring.
In older units with serial numbers below 700000), two jumpers must be attached to
the motherboard and a socket and interconnections for pre-emphasis modules must be
installed.
The socket and interconnections are supplied as RET-033, to be ordered
separately.)
Installation of this retrofit kit affects certain parts of the 1 00A Operating Manual, so a list
of changes to the manual is included on page 9). Also included are field alignment
and performance verification instructions (on page 11), a circuit description (on
page 18), a parts list on page 23), and schematics and assembly drawings on page
26) for Card #1F10.
95307-000-01 6/87
Orban Associates Inc.
645 Bryant Street
San Francisco, CA 4107
Main: (415) 57-1063
Sales: (415) 57-1067 Telex: 17-1480
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