Lynx.GX Installation and Management
Often, an RF power meter has a limit to the input power it can measure without damage. Proxim advises you
place a calibrated fixed value RF attenuator (typically 20 dB or more) between the radio and the power meter to
ensure proper operation and safety for the RF power meter. The value of this fixed attenuation then can be
added to the value of the RF power meter reading to obtain the actual transmitter output power.
Other typical causes of inadequate RSL are:
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Path obstructions
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Excess loss in connectors/cables (poor terminations, improper bend radius, kinked, crushed, …)
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Poor quality or unaccounted for adapters and pigtail jumper cables
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Different antenna polarization at each end of the link
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Improper configuration of the radio’s transmit power output adjustment
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Insufficient RF output power (faulty radio transmitter)
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Faulty antenna
7) Confirm Received Signal Level (RSL).
Connect a voltmeter to the RSL measurement port on the RF Unit. This voltage reading corresponds to the
Received Signal Level (RSL) of the near-end radio. RSL is the amount of signal the near-end radio is receiving
from the far-end radio. Because the antennas have not been finely aligned, the RSL value at this time will not
be the desired value. However, you can verify that some communication is taking place between the two units.
Use the RSL voltage reading to align the antennas. Align one antenna at a time as discussed in “Alignment
Guidelines” on page 19. Align both ends of the link before proceeding.
The RSL voltage output on the radio’s front panel supplies a voltage over the usable range of the radio. (You
can also use the RSL port on the RFU, which has both DC and Tone available.)
The RSL of both sides of the link can also be measured using the NMS port. See “Management with the Web
Interface” on page 33 for details about connecting to the NMS port and viewing performance parameters.
If the RSL is not at the expected level, re-check the path clearance and transmission line, as these are the
typical causes of insufficient RSL.
You can verify radio operations by connecting units back-to-back with attenuators (60-80 dB), as described in
“Step 3. Test Radios Back-to-Back” on page 11. If the problem persists, see “6.0 Troubleshooting” on page 93.
The transmitter output power adjustment on the radio affects the RSL. Depending upon EIRP limits (if any),
path distance, and antenna gain, you may need to adjust the output transmit power to the proper level before
putting the units in service.
Chapter 2. Installing the IDU and RFU
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