Tools Required; Installation Procedure; Nyquist Filter Removal - Comtech EF Data SDM-9000 Installation And Operation Manual

SDM-9000 Satellite Modem

3.5.2.2 Tools Required

The following tool is required to accomplish the task of this section:
Driver, Nut

3.5.2.3 Installation Procedure

Note: The Nyquist filter PCB is field-replaceable to enable the user to install optional
data rates.
1. Install the Nyquist filter PCB as a daughter card on the modulator or
TX PCB
RX PCB
2. Refer to Figure 3-7 for connector locations.

3.5.2.3.1 Nyquist Filter Removal

1. Remove the TX filter (AS/4124-1) or RX filter (AS/4124-2) as follows:
2. Carefully unplug the filter card from the modulator or demodulator connectors.
Rev.4
Tool Description
1/4-inch
demodulator PCB as follows:
Type Part Number
AS/4124-1
AS/4124-2
a. Ensure that each filter has three 10-pin connectors for I/O and power.
b. Mount the card on the four standoffs with a 1/4" hex nut on each standoff to
secure the PCB. Tighten each nut using the 1/4" nut driver.
a. Open the modem front door and turn off the power.
b. Remove the modulator or demodulator PCB from the modem and place on a
static-free work area.
c. Remove the four 1/4" hex nuts that secure the filter card (AS/4124-X) using
the 1/4" nut driver.
Note: Do not remove the screws and standoffs from the modulator or
demodulator. Remove the four hex nuts only.
Used with
Baseband Modulator PCB (AS/3969)
Baseband Demodulator PCB (AS/3970)
Configuration
3–11