User Interfaces
DMDVB20 LBST Satellite Modem
4-6
TM138 – Rev. 1.0
The UPLINK FREQUENCY is a calculated measurement
of both the BUC LO and OSC SIDE BAND. Once the
menus are entered correctly, the user can control the
uplink Frequency from this menu.
POWER (dBm)
{0 to -25 dBm}
Allows the user to enter the Transmitter Power Level.
CARRIER
{ON, OFF, AUTO, VSAT, RTS}
Allows the user to select the carrier type. Refer to
Appendix C for further information.
CARR DLY(SEC)
{0-255}
Allows the user to select the time delay after power-up
before the Tx Carrier may be enabled. This allows time
for the BUC to stabilize.
SPECTRUM {NORMAL, INVERTED}
Allows the user to invert the direction of rotation for
QPSK Modulation. Normal meets the IESS
Specification.
Spectral inversion may be required if the BUC LO is
higher in frequency than the BUC output frequency.
When BUC LO is higher than the BUC output frequency,
this creates a spectral inversion and the IF Spectrum
must be again inverted to compensate.
MODULATION {QPSK,
BPSK, OQPSK, 8PSK, 16QAM}
Allows the user to select the modulation type.
SPECTRAL MASK
{Intelsat 0.35, DVB SAT 0.35, DVB SAT 0.25, DVB
SAT 0.20}
Allows the user to set the spectral shape of Tx Data
Filter.
COMPENSATION
{0.0 – 1.0}
Allows you to offset output power by up to 1 dBm. This
is intended as a correction for user cabinet connectors.
DATA (menu)
DATA RATE (bps)
{Refer to Technical Specs for Data Rates}
Allows the user to set the Data Rate in bps steps via the
Front Panel Arrows or Keypad.
SYMB RATE (sps)
Allows the user to view the Symbol Rate.
INNER FEC
Viterbi
{1/2, 3/4, 7/8, None}
Optional FEC Rates:
Sequential
{1/2, 3/4, 7/8}
Trellis
8PSK
{2/3}
Turbo
{1/2,
3/4,
7/8}
Comstream
Seq {3/4}
DVB VIT
{1/2, 2/3, 3/4, 5/6, 7/8}
DVB Trellis
{2/3, 5/6, 8/9}
Summary of Contents for DMDVB20 LBST
Page 11: ...Table of Contents DMDVB20 LBST Satellite Modem xii TM138 Rev 1 0...
Page 14: ...DMDVB20 LBST Satellite Modem Introduction TM138 Rev 1 0 1 3...
Page 20: ...Installation DMDVB20 LBST Satellite Modem 2 6 TM138 Rev 1 0...
Page 36: ...Theory of Operation DMDVB20 LBST Satellite Modem 3 16 TM138 Rev 1 0...
Page 67: ...DMDVB20 LBST Satellite Modem User Interfaces TM138 Rev 1 0 4 31...
Page 73: ...Rear Panel Interfaces DMDVB20 LBST Satellite Modem 5 6 TM138 Rev 1 0...
Page 79: ...Maintenance and Troubleshooting DMDVB20 LBST Satellite Modem 6 6 TM138 Rev 1 0...
Page 88: ...DMDVB20 LBST Satellite Modem Technical Specifications TM138 Rev 1 0 7 9...
Page 90: ...Appendix A DMDVB20 LBST Satellite Modem A 2 TM138 Rev 1 0...
Page 97: ...DMDVB20 LBST Satellite Modem Appendix B TM138 Rev 1 0 B 7...
Page 100: ...DMDVB20 LBST Satellite Modem Appendix C TM138 Rev 1 0 C 3...
Page 107: ...DMDVB20 LBST Satellite Modem Appendix D TM138 Rev 1 0 D 7...
