Microwave Data Systems MDS 4310, Installation, Operation & Field Maintenance

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MDS 05-2415A01, Rev. A PROGRAMMING AND DIAGNOSTICS 3-9
With the radio’s transmitter keyed…
FPWR
---------- Forward RF power output of Transceiver.
Display will read
FWD POWER = xxx WATTS
.
VSWR
---------- Calculated VSWR based on forward and reflected power levels.
Display will read
VSWR= x .x : x
.
Test Modes
Using the Hand-Held Terminal, a technician can invoke several diagnostic and test modes
that are useful in evaluating the operation of both the transceiver and an internal modem. The
test modes are invoked by typing the commands listed below followed by an
ENTER
keystroke.
KEY
----- Keys the transmitter with the transmit modulation enabled.
DKEY
---- Unkeys the transmitter.
TEST_1
-- Keys the transmitter and enables a constant DTMF Loopback test tone. This
test is useful for measuring the radio’s diagnostic deviation level with a
communications monitor.
TEST_2
-- Disables the DTMF Loopback test tone and unkeys the transmitter.
TEST_5
-- Disables the transceiver’s VCO circuit.
TEST_6
-- Enables the transceiver’s VCO circuit.
TEST_7
-- Turns on the modem test tones and keys the transmitter for 12 seconds.
• With 1200 bps modem: 1200/2200 Hz tone.
• With 4800/9600 bps modem: Sine wave at 1/2 data rate (bps).
EQUIPMENT DIAGNOSTICS DEFINITIONS
Software is available for service personnel to use a MDS Master Station as a diagnostics tool
for system monitoring and maintenance. MDS 2000 Diagnostic and Control System software
uses the master station to transmit a special message to all remote radios in a given system
asking one remote radio at a time to respond with a test signal. The test signal is analyzed by
the master station and the results are displayed on the screen of a personal computer running
the MDS software. In order for the software to know which radios to poll for a test signal, an
“Equipment List” must be created by the system operator which describes the address of the
radio and its capabilities. The remote radio’s diagnostic address is referred to as its loopback
code in MDS documentation and software. For more information, refer to the MDS 2000
Diagnostics and Control System Software User’s Guide (MDS P/N 05-1919A01).
Since it is possible to have MDS 4310 radios of different capabilities installed in the same
system it is very important to know the exact profiles of each unit. The following are
descriptions of the various diagnostic capabilities available for the MDS 4310 Transceiver.
All of the diagnostic modes listed in Table 3-1 are available from MDS 4310 transceivers
with a Remote Maintenance Module (P/N 03-1958A01) properly installed in jacks J5 and J7
of the transceiver motherboard.