Comtech EF Data DD2401 VME - Manual (Page 11)

DD2401 VME L-Band Demodulator Card Installation & Operational Manual Introduction
MN-VME2401 – Rev. B 1-2
Introduction 1
1.0 Description
The Radyne DD2401 VME L-Band Demodulator is intended for use as apart of the receiving
ground equipment in a satellite communication system. The card based unit is designed to
receive a single carrier up to 5 MBits/s throughput on the RS422 synchronous interfaces. The
DD2401 VME card is compatibility with all Radyne's DMD products including the DMD20, DMD50
and OM20.
Figure 1-1. DD2401 VME L-Band Demodulator Card
The DD2401 VME Demodulator Card is designed to perform at one end of the satellite Single
Channel Per Carrier (SCPC) Link receiving the carrier. The VME can be used in a Mesh or Star
Topology Network. The Demodulator supports BPSK, QPSK, OQPSK or 8PSK demodulation.
The demodulator can be accessed via a single RS485 serial link system for complete remote
monitor and control (M&C) capability and offers the terminal control via an RS232 connection.
Selection of any data rate is provided over the following ranges:
BPSK: 9.6 Kbps to 1200 Kbps
QPSK: 9.6 Kbps to 4.375 Mbps
OQPSK: 9.6 Kbps to 4.375 Mbps
8PSK: 64.0 Kbps to 5.0 Mbps
The VME Demodulator Card can track and acquire a carrier over a programmable range of ± 1
kHz to ± 42 kHz. Acquisition times of less than three seconds are typical at data rates greater
than 64 Kbps over a range of ± 25 kHz.
To facilitate link testing, the VME Demodulator Card incorporates a built-in ‘2047’ test pattern with
BER measurement capability.