User Manual

Chapter 14 ● Calibrating transmit power
180 Release 2.0, 910056 Rev01d
Measuring power loss for the sector
This procedure explains how to measure the loss of transmit power over the sector’s transmit jumper cable
and test equipment at three different transmit power levels.
Requirements
A CLI session to the IP-RN 8000
Procedure
1. Using the CLI session to the IP-RN 8000, set the sector’s transmit power level to 25 dBm as follows:
AIRVANA-03>enable
AIRVANA-03#configure
AIRVANA-03(config)#sector-element element1/4/1
AIRVANA-03(config-element)#tx-power 25
AIRVANA-03(config-element)#no shutdown
These commands configure the first sector (identified by sector-element element1/4/1).
To configure sector 2, use: sector-element element1/4/2.
To configure sector 3, use: sector-element element1/4/3.
2. As a result of these commands, the sector transmission blossoms. Wait until the power meter shows a
stable power level. Find the differences between this detected power level and the configured transmit
power level (25 dB) and write it down. The detected power level should be somewhat less than the
transmit power level due to power lost over the antenna jumper cable and test equipment.
3. Change the transmit power level for the sector to 35 dBm using the following:
AIRVANA-03(config-element)#tx-power 35
4. The sector transmission blossoms. Wait until the power meter shows a stable power level. Find the
differences between this detected power level and the configured transmit power level (35 dB) and write
it down.
5. Change the transmit power level for the sector to 45 dBm using the following:
AIRVANA-03(config-element)#tx-power 45
6. The sector transmission blossoms. Wait until the power meter shows a stable power level. Find the
differences between this detected power level and the configured transmit power level (35 dB) and write
it down.
7. Find the average of the three numbers you calculated. Each of those calculations was the power loss at a
given transmit level. The average of those is the average power loss (without compensation for test
equipment) and is used to calibrate the power level of the transmission on this sector.
This procedure is complete. Go to Setting the sector’s transmit power
on page 181.