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INTRODUCTION
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The RFM provides a power and control interface to the Transmit-Receive Switch (TRS) to
switch 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 power
amplifiers to the radio and it uses a single RF path that is switched between TX and RX. The
RFM supports a wide range of operational frequencies that are converted into an Intermediate
Frequency (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) to
switch the system between TX and RX modes for Time Division Duplexing (TDD) and Half-
Duplex Frequency Division Duplexing (HD-FDD).
2.3.5 Transmit Coupler
The Mars radio platform uses the "ZARC-25-551+" High Power Signal Tap as a Coupler to
monitor the TX signal and provide feedback to the RFM.
2.3.6 Transmit-Receive Switch
The Mars Transmit-Receive Switch (TRS) switches between TX and RX modes for Time
Division Duplexing (TDD) and Half-Duplex Frequency Division Duplexing (HD-FDD). In TX
mode the signal from the Coupler is routed to the Low-Pass Filter (LPF). In RX mode the signal
from 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 level
of 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 status
information under the control of the CBB.
2.3.9 RF Antenna
The 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.
2-6
COM-00-21-05
OCTOBER 2021
Version No.: A
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