Futurecom Systems Group ULC. CMDUHF Manuale Utente
8M074X01-01 Rev.1
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6.2 POWER AMPLIFIER
The Power Amplifier is capable of delivering up to 35 W output. A band-pass filter filters out of band
unwanted signals. The driver and the power amplifier provide the required output power. The output
power level is set under software control. The real output power is measured and compared with the
desired output power level. An Automatic Level Control Loop adjusts the real output power to be
precisely equal to the preset level.
unwanted signals. The driver and the power amplifier provide the required output power. The output
power level is set under software control. The real output power is measured and compared with the
desired output power level. An Automatic Level Control Loop adjusts the real output power to be
precisely equal to the preset level.
An output low-pass filter assures that no unwanted higher harmonics are present on the output of the
Channel Module.
Channel Module.
The reflected power is monitored and the output power is reduced when the reflected power increases.
The driver stage and final power amplifier stages are fully redundant. Internal monitoring system can
switch between the main and redundant paths if the detected conditions might indicate abnormal
conditions in the PA stages.
switch between the main and redundant paths if the detected conditions might indicate abnormal
conditions in the PA stages.
6.4 CONTROLLER BOARD
The Controller Board controls the operation of the Channel Module. It contains the microcontroller
with Flash program and EEPROM personality storage. Communication with the outside world is
facilitated with two RS-232, RS-485 and I
with Flash program and EEPROM personality storage. Communication with the outside world is
facilitated with two RS-232, RS-485 and I
2
C serial links. One RS-232 port is accessible via 8-pin mini
DIN connector on the front panel. Eight digital Input/Output lines are provided for output and outside
event monitoring (e.g. room or cabinet door opening). Six analog inputs and four analog outputs are
provided as well.
event monitoring (e.g. room or cabinet door opening). Six analog inputs and four analog outputs are
provided as well.
The Controller Board contains DTMF encoder and low-speed data encoder and decoder.
The front panel reset (RESET) and Transmit Disable (TX DIS) inputs are monitored. These two inputs
are accessed via two front panel holes with a round tool 2.5mm (0.1”) in diameter. Finally, the front
panel indicators are controlled by the Controller Board. These are:
are accessed via two front panel holes with a round tool 2.5mm (0.1”) in diameter. Finally, the front
panel indicators are controlled by the Controller Board. These are:
Tx disable (TX DIS),
DC Supply Power (DC ON),
Transmitter On (TX ON),
Receive Signal Detected (RX ON),
Output power fault (PWR),
Output VSWR fault (VSWR).
DC Supply Power (DC ON),
Transmitter On (TX ON),
Receive Signal Detected (RX ON),
Output power fault (PWR),
Output VSWR fault (VSWR).