Table of Contents
Advertisement
_________________________________________________________________________________________________________
2.3.1 Power Supply Unit (PSU)
The PSU requires an input voltage of 36 – 60 VDC capable of supplying a minimum of 10 amps.
The PSU also provides power and speed control to the cooling fans.
2.3.2 Communications Base Board (CBB)
The CBB provides high flexibility in both frequency range and channel size. It uses GPS for
location and synchronization and provides the inputs and outputs for the console, serial, and
Ethernet ports. It also provides the connection to the outside LCD display that is visible on the
outside of the radio.
The Mars Communications Base Board (CBB) acts as the main controller for the system. It
provides general-purpose computing resources based on an embedded Linux operating system.
The CBB includes logic implemented in FPGAs, DSPs, and a programmable RF Transceiver
and supports the following user interfaces:
•
Reset button with embedded power LED
•
2 x 10/100 MB Ethernet RJ45 sockets
•
Serial Data through an RJ45 socket
•
Serial Console interface through an RJ45 socket
•
GPS antenna connection
The CBB includes a GPS receiver to provide a system and network synchronization using the 1-
PPS signal and GPS data to provide the location, time of day, speed, and heading information.
The CBB provides the TX signal directly to Power Amplifier.
The CBB has a control and status interface with the Radio Frequency Module (RFM) and
receives the RX signal as an Intermediate Frequency (IF) from the RFM. The CBB also provides
the RFM with a 40 MHz reference clock signal.
The CBB provides status information to the System Status Display under software control.
2.3.3 Radio Frequency Module (RFM)
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.
COM-00-21-05
Version No.: A
2-5
INTRODUCTION
OCTOBER 2021
Advertisement
Table of Contents
