Ground; System Requirements - Comtech EF Data SDM-650B Installation And Operation Manual

SDM-650B Satellite Modem

2.2.7 GROUND

A #10-32 stud is available on the rear panel for the purpose of connecting a common
chassis ground between all of the equipment.

2.3 System Requirements

The standard modem with all cards installed (as listed in Chapter 1) is a full-duplex
QPSK satellite modem.
The system can also be configured for TX-only or RX-only operation:
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The modem interface is configured by the selection of the data interface card. Refer to
Chapter 3 for discussion on the data interface cards.
The modem data/code rate is configured by the installation of a daughter card (AS/0363,
AS/0715, or AS/0930-1) on the modulator, and a daughter card (AS/0362, or
AS/0929-X) on the demodulator. The Utilities function must be set up to be compatible
with the daughter cards. Refer to Chapter 4 for information on the Utilities function. The
modem will be set up to match the daughter cards when it is shipped from the factory.
Rev. 5
For a TX-only system, the demodulator (AS/0778-X) and decoder (AS/0365-X)
are removed. The Utility menu on the front panel must be entered and Operation
mode selected. Enter the menu and select TX-only. This will mask the receive
faults and receive stored faults in the Faults menu.
For an RX-only system, the modulator (AS/0773-X) is removed. Enter the Utility
menu on the front panel and select Operation mode. Enter the menu and select
RX-only. This will mask the transmit faults and transmit stored faults in the
Faults menu.
Installation
2–5