MDS 05-3628A01, Rev. B
MDS 4790M (MPT 1411) I/O Guide
39
RSSI is a “raw” signal level indicator, continuously updated in real time at
about a 1 second interval. The RSSI command causes the diagnostic port to
enter an RSSI update mode. The diagnostic port will display an updated RSSI
output line at roughly a 2 second interval refresh rate. The diagnostic port will
stay in this mode until you press the Enter key at the PC.
The RSSI! command provides a one-time reading and display of RSSI at the
diagnostic port.
RTU [ON/OFF/0-80]
This command enables or disables the radio’s internal RTU simulator, which
runs with GE MDS’ proprietary diagnostics software. The internal RTU
simulator is an optional feature which may or may not be available on a
particular radio; use the
OPT
command to see whether
DIAGNOSTICS
is
ON
(internal RTU simulator was purchased for the radio) or
OFF
(not available on
this radio).
This command can also be used to set the RTU’s address. The internal RTU is
used for testing system payload data and pseudo bit error rate testing. It can be
helpful in isolating a problem to either the external RTU or a transceiver board.
RX [xxx]
This command displays or changes the radio’s receive frequency. Normally,
the radio will be shipped to the customer programmed with the
customer-specified frequency. If the operating frequency was not specified
when the radio was ordered, the RX frequency is set to the centre of the radio’s
operating band (see Section 2.6,
Model Number Codes
, beginning on page 6
for the model’s operating band).
If the operating frequency is changed more than 5 MHz from the factory
setting, the helical filters must be re-tuned. If the radio is equipped with a
duplexer, and the frequency is changed more than 100 kHz, the duplexer must
be re-tuned or replaced.
RXMUTE
This screen is used to set or display the radio’s RX (receive) Muting status. RX
muting may be required when the radio is configured as a full-duplex remote
and is communicating through a repeater station. RX muting prevents the radio
from hearing its own transmissions, which can cause errors in some software
applications.
Entering the
RXMUTE
command without a parameter shows whether the
muting feature is
ON
(enabled) or
OFF
(disabled). Entering the
RXMUTE
command followed by
ON
enables muting; entering
OFF
disables it.
RXLEVEL [–20 to +3]
The
RXLEVEL
and
TXLEVEL
(page 44) commands control the audio level
settings when the radio is operating in analog mode. When used alone, the
RXLEVEL
command displays the receive level in dBm. Entering the
RXLEVEL
command followed by a number from
–
20 to +3 resets the audio level in dBm.
Receive Frequency screen,
page 54
RX Mute Mode screen, page 54
Receive Level [–20 to +3] screen,
page 58
