User Manual

INSTALLATION AND MAINTENANCE MANUAL
LYNX.sc E1 FAMILY
SPREAD SPECTRUM RADIOS
OCTOBER 1998
PAGE 4-12 SECTION 5: TROUBLESHOOTING
4.6.3 RX SYNC (Receiver Synchronization) Alarm
Function:
This LED indicates that the demodulator function is not synchronizing with the intended received
signal.
When the RX SYNC alarm is active, the LYNX.sc radio injects AIS onto the received CEPT-1 (line
transmit out), even if AIS has been disabled by rear panel DIP switch setting.
Possible Causes:
❖ Severe path fading due to atmospheric conditions (usually accompanied by Far-End RX
SYNC or BER alarm) and low RSL voltage reading
❖ Poor transmission line connections (usually accompanied by Far-End RX SYNC or BER
alarm) and low RSL voltage reading
❖ Antenna problems, misalignment, or path clearance (usually accompanied by Far-End
RX SYNC or BER alarm) and low RSL voltage reading
❖ Improper radio settings (frequency channel, spread code)
❖ Interference
❖ Far-End radio transmitter circuitry is faulty
❖ Near-End radio receiver circuitry is faulty
Recommended Actions:
Check the following at each end of the link:
❖ Verify that rear panel filters are opposite channel plans on each end (e.g. one is A1 and
other is A2).
❖ Verify that rear panel DIP switch settings match each installed filter (see Section
3.12.1).
❖ Verify that each radio is set to the same spreading code (see Section 3.12.3).
❖ Verify that all connections between radios and antennas are secure and all devices
between radios and antennas are rated for the radio frequency band (2.4 or 5.8 GHz).
If RX SYNC alarm continues, follow recommended actions for a BER alarm as described in
Section 4.6.2.