Specifications
MDS 05-3438A01, Rev. E MDS 4790/9790 Series I/O Guide 47
Push-to-Talk Keying
Delay
PTT [0-255]
This command sets or displays the amount of time to wait after the radio
receives a keying signal from either the PTT or RTS lines before actu-
ally keying the transmitter. Entering the
PTT (Push-to-Talk) command
without a parameter displays the timer value associated with the keying
delay selection. Entering the
PTT command with a parameter ranging
from 0 to 255 sets the timer value in milliseconds. A timer value of zero
means that the radio will key immediately following the keying signal.
The command is applicable for DCE operation, when the radio is keyed
either by the PTT signal or by RTS. The command is not applicable
when the radio is keyed by the
KEY command.
Transmitter Power
Output Level
PWR [20–37]
This command sets or displays the master station’s RF forward output
power setting. Entering the
PWR command without a parameter displays
the forward output power in dBm. Entering the
PWR command with a
parameter ranging from 20 to 37; verify using
OPT command) sets the
forward output power in dBm. The default setting is 37 dBm, which is
equivalent to 5 watts.
To read the radio’s actual (measured) power output, use the
SHOW PWR
command.
NOTE: The RF power output of MDS 4790E ETSI certified radios is
fixed at 5 watts. No adjustment is possible.
Active Radio
Selection
RADIO [AUTO/A/B]
This command sets or displays the transceiver board selection. When
RADIO AUTO is selected automatic switchover is enabled. If a major alarm
is detected and a redundant radio is operational, control will automati-
cally switch to the alternate radio. The
RADIO AUTO setting should be
used even if there is only one transceiver board installed. This allows the
master station to be easily upgraded at a future date by simply inserting
another transceiver board.
Entering the
RADIO command without a parameter shows the equipped
active/inactive status for both the A and B radios.
Push-to-Talk Delay
screen, Page 66
A
B
Output Power Setting [37-20]
screen, Page 65
A
B
Radio Selection screen, Page 74
A
B