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Siemens A53685 Installation & Operation Manual
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INTRODUCTION_________________________________________________________________________________________________________2-6COM-00-21-05 OCTOBER 2021Version No.: AThe RFM provides a power and control interface to the Transmit-Receive Switch (TRS) toswitch the system between TX and RX modes for Time Division Duplexing (TDD) and Half-Duplex Frequency Division Duplexing (HD-FDD).2.3.4 Power Amplifier (PA)The Radio Frequency Module (RFM) provides the frequency specifics, filters, and poweramplifiers to the radio and it uses a single RF path that is switched between TX and RX. TheRFM supports a wide range of operational frequencies that are converted into an IntermediateFrequency (IF) for common filtering. The IF RX signal is routed to the CBB.The RFM provides power, control, and status interface to the Power Amplifier.The RFM uses the output of the Coupler to manage the TX signal level.The RFM provides a power and control interface to the Transmit-Receive Switch (TRS) toswitch the system between TX and RX modes for Time Division Duplexing (TDD) and Half-Duplex Frequency Division Duplexing (HD-FDD).2.3.5 Transmit CouplerThe Mars radio platform uses the “ZARC-25-551+” High Power Signal Tap as a Coupler tomonitor the TX signal and provide feedback to the RFM.2.3.6 Transmit-Receive SwitchThe Mars Transmit-Receive Switch (TRS) switches between TX and RX modes for TimeDivision Duplexing (TDD) and Half-Duplex Frequency Division Duplexing (HD-FDD). In TXmode the signal from the Coupler is routed to the Low-Pass Filter (LPF). In RX mode the signalfrom the LPF is routed to the RFM.2.3.7 Low-Pass Filter (LPF)The Mars Low-Pass Filter (LPF) provides an additional safeguard that guarantees that the levelof harmonics emitted by Mars is well below the FCC requirements.2.3.8 System Status Display (SSD)The Airlink Mars uses the “LCR-U01602DSF/AWH” LCD module as a system status display.The display comprises a 2x16 character interface to provide the user with system statusinformation under the control of the CBB.2.3.9 RF AntennaThe Mars RF antenna is typically provided by the end-user based on operational requirements.The antenna should be matched to the operational frequency, with an impedance of 50 ohms. |
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