
6
1.3.4.5 FREQUENCY HOPPING MODE INDICATOR (FH).
The FH LED will illuminate whenever one of three frequency hopping modes is selected (LOS
FM Frequency Hopping, LOS AM Frequency Hopping and WB Frequency Hopping).
1.3.4.6 AMPLITUDE MODULATION MODE INDICATOR (AM).
The AM LED will illuminate whenever one of two amplitude modulation modes is selected
(LOS AM, LOS AM Frequency Hopping).
1.3.4.7 RF INPUT LEVEL UNDER/OVER DRIVE (LVL).
This feature is not currently active but will be implemented in future upgrades.
1.3.4.8 TX STATUS INDICATOR (TX).
The TX LED will illuminate during a good transmit condition.
Depending on the duty cycle of
some data transmission waveforms such as DAMA, ANW2 and SRW, the TX LED may flicker.
This is due to the fast switching time between transmit and receive and DOES NOT indicate a
system malfunction.
1.3.4.9 FAULT STATUS INDICATORS (FLT).
The FLT LED will illuminate to indicate a fault condition, such as attempting to transmit at a
frequency that is not valid in the selected mode or over temperature conditions.
1.3.4.10 REMOTE OPERATION STATUS INDICATOR (RMT).
The REMOTE LED will illuminate when the PA has received a
REMOTE ON
command from
an external terminal and will stay on until the
REMOTE OFF
command has been received.
Note that the front panel LOS and SAT buttons are ignored during remote operation.
1.3.5 REMOTE CONTROL INTERFACE.
USB (+5, GND, D+ and D-) and RS-232 interfaces (GND, TXD and RXD only) will provide
remote control of the amplifier’s modes of operation and power levels. When a terminal has
been connected to the remote interface and the proper escape sequence has been sent by the
terminal (refer to sections 3.5 and 3.6 for remote control operation) the PA will start
communications with the terminal and will illuminate the RMT LED on the front panel. At this
point the TCR-MBA-50 (both versions) front panel buttons will become inactive, except to
power the amplifier off. The PA will NOT detect the removal of the remote interface connection
and will remain in remote mode until the power is cycled OFF, if the remote control cable is
unexpectedly removed.