78 MDS 4790/9790 Series I/O Guide MDS 05-3438A01, Rev. F
S/N Ratio This screen shows the current signal-to-noise ratio in dBm.
Radio Selection Use this screen to set or show the transceiver board selection. When you select
AUTO, automatic switchover is enabled. If the master station detects a major alarm
and a redundant radio is operational, control automatically switches to the alternate
radio. Use the AUTO setting even if there is only one transceiver board installed.
This allows you to easily upgrade the master station at a future date by simply
inserting another transceiver board.
The third line on the display shows which radio transceiver board is currently
active.
A selection of A or B forces the active transceiver board to the A or B transceiver
board, and disables standby redundancy. These settings should rarely be used;
they are provided mainly for diagnostic test purposes.
To change the radio selection setting, press the ENTER key, then use the up/down
arrow buttons to select AUTO, A or B. Press ENTER again to make the change.
Transmitter Status This screen shows the transmitter state. Keyed means the transmitter is set to
transmit; dekeyed means the transmitter cannot transmit. Configure the
transmitter to keyed or dekeyed by selecting Manual Key from the Configuration
menu (Page 72). Use this setting when working on the radio, and the radio must
be keyed to evaluate transmitter output power.
Show Temperature
and Voltages
This screen shows the radio’s internal temperature and voltages. The input voltage
is the voltage that connects to the transceiver board and is unregulated. This
voltage is the output from the power supply assembly. The output voltage is read
after the10 Vdc regulator on the transceiver board.
Serial Number This screen shows the serial numbers of the transceiver boards. These numbers
will not match the serial number on the radio’s serial number label. If the radio is
not equipped with a second transceiver board, one of the lines reads NOT
EQUIPPED.
Software Revision This screen shows the internal software part number and version number.
S/N Ratio
SNR, SNR! command, Page 5
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