Modulator Checkout; Initial Power-Up - Radyne DMD20 Installation And Operation Manual

Installation
Standard DMD20 Factory Configuration Settings
Modulator:
Data Rate:
Mode:
Satellite Framing:
Scrambler:
Drop and Insert:
Inner FEC:
Outer FEC:
Modulation:
Frequency:
Modulator Output Power:
Demodulator:
Data Rate:
Mode:
Satellite Framing:
Scrambler:
Drop and Insert:
Inner FEC:
Outer FEC:
Modulation:
Frequency:
To lock up the modem, enter 'IF Loopback Enable' under the Test Menu, or connect a Loopback
Cable from J1 to J2 on the rear panel of the modem.

2.5 Modulator Checkout

The following descriptions assume that the DMD20 is installed in a suitable location with prime
AC power and supporting equipment available.

2.5.1 Initial Power-Up

Before initial power up of the DMD20, it is a good idea to disconnect the
transmit output from the operating ground station equipment. This is
especially true if the current Modulator Configuration Settings are
unknown, where
communications traffic. New units from the factory are normally shipped
in a default configuration which includes setting the transmit carrier off.
2-4
DMD20/DMD20 LBST Universal Satellite Modem
2.048 Mbps
Closed Network
None
V.35 (IESS)
Disabled
1/2 Rate Viterbi
Disabled
QPSK
70.000000 MHz
-20 dBm
2.048 Mbps
Closed Network
None
V.35 (IESS)
Disabled
1/2 Rate Viterbi
Disabled
QPSK
70.000000 MHz
incorrect settings could disrupt the existing
TM103 - Rev. 2.5