GE MDS SD Series Reference Manual page 101

MDS 05-4846A01, Rev. C
Table 14. Troubleshooting Guide
Difficulty Recommended System Checks
Unit is
a. Check for the proper supply voltage at the power
inoperative.
connector.
b. The transceiver's internal fuse may have opened. Factory
repair is required.
Interference is
a. Use the Spectrum Analyzer to check for interference near
suspected.
the radio channel.
b. Try re-orienting the station antenna to limit interference to
and from other stations.
No link with Master,
a. Check for secure interface connections at the radio and
or poor overall
the connected device.
performance.
b. Check the antenna, feedline and connectors. Reflected
power should be less than 10% of the forward power reading
(SWR  2:1 or lower).
c. If the Remote radio links, but performance is poor, check
the received signal strength using the RSSI feature on the
Radio Performance Menu. If RSSI is low, it may indicate
antenna problems, or misalignment of directional antenna
headings.
d. Verify proper programming of system parameters: mode,
data interface baud rate, RF output power, etc.
e. Check for alarms using the Statistics/Events Menu.
No communication a. Connect terminal emulator to COM1 port, cycle power,
to user interface and press the Enter key within 10 seconds to obtain Login
(menu system) prompt.
BER is too high. a. If in packet mode, check the packet settings menu for
Data throughput is proper configuration.
spotty.
b. If in serial mode, check the COM2/COM1 port settings
menu for proper configuration.
Latency is too high.
a. Adjust packet node settings.
Unit won't wake up a. Disconnect the device connected to COM2, and disable
from Sleep Mode Sleep Mode on the Device Settings Menu.
b. Verify that the connected device is outputting the required
0 Vdc to 5 Vdc to control sleep mode on Pin 4 of COM2.
Correct as necessary.
c. Re-enable Sleep Mode on Device Settings Menu,
re-connect device to COM2, and check for proper operation.
Password lost or Contact GE MDS for password reset authorization code.
forgotten Proof of authorized user required.
Alarm message No load on Antenna connector or poor/shorted/open load.
"RF Output Out of Check condition of antenna cable, connectors, and antenna
Range" system.
Transmitter keys Many terminal programs raise the RTS line by default.
when using terminal Keying can be avoided by setting the transceiver's RTSkey
communications parameter to OFF (Radio Configuration>>Advanced
program. Settings Menu)
SD Series Ref. Manual (Packet & Transparent Mode) 93