Chapter 10 Buc And Advantech Sspb; Sspb (Buc) Interface Connections; Lnb Interface Connections; M&C Interface Connections - Advantech AMT-73 Installation And Operation Manual

CHAPTER 10
The purpose of this chapter is to provide the procedures for operating the AMT-70 satellite modem
with the AdvantechAMT BUC and the AdvantechAMT SSPB. P

10.1 SSPB (BUC) Interface Connections

1. Connect BUC WR75 waveguide output to a suitable load. The Ortho Mode Transducer
(OMT) properly mounted to antenna or power attenuator will qualify as a suitable load.
2. Set the BUC power OFF using the command BUCPOWER OFF.
3. Connect AMT-70 (J6) to BUC (IFL) using low-loss 50-Ohm cable with type N (male)
connectors at each end. The cable loss must not exceed 12.5 dB at 2000 MHz. Cable
centre conductor DC resistance (end to end) must not exceed 0.5 Ω. For cable runs up to
100 meters, useLMR-600 or equivalent.
4. Connect AMT-70 (J5) to BUC (RS-485) using twisted pair cable.The connector supplied
with the AdvantechAMT SSPB is used at one end and a 9-pin male D connector at the
other.

10.2 LNB Interface Connections

1. Connect LNB WR75 waveguide input to OMT output.
2. Set the LNB power OFF using the command LNBPOWER OFF.
3. Connect LNB output to AMT-70 (J1) using low-loss 75-Ohm cable with type F (male)
connectors at each end. Cable loss must not exceed 25 dB at 2150 MHz.
10.3 RS-232 M&C Interface Connections
Connect M&C RS-232 (P8) interface to a PC with available RS-232 interface.
10.4 AMT-70 Modem Configuration
1. Refer to AMT-70 manual regarding the setting of the modulator parameters.
2. Use the following formula to determine the modulator IF frequency based from upon the
transmit frequency:
(BUC TX frequency) - (BUC LO 13.05 GHz) = Modulator IF carrier frequency.
Example for the desired TX frequency of 14.250 GHz:
14.250 - 13.050 = 1200 MHz.
3. Refer to AMT-70 manual regarding the setting of demodulator parameters.
4. Use the following formula to determine demodulator IF frequency based upon the receive
frequency from the satellite: RX frequency – LNB LO frequency = IF
AMT-70/AMT-73/AMT-75 Installation and Operation
BUC AND ADVANTECH SSPB
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