Airspan AS4000, Installation Manual

Page: 137 / 193

Setup and Test
133
Set TX Power
The recommended single user TX output power (QPSK/16QAM) is +18dBm for 3.4-3.6GHz,
+20dBm for 1.8-1.9GHz, and +21dBm for all other bands. This procedure is used to measure
the TX output power when set up in commissioning mode 1.
System Soak
It is necessary that the system is powered up for at least two hours to allow for
temperature stabilisation before proceeding with the measurement of the TX power
Tools and equipment needed.
Item Description Recommended Model Quantity
1 50 ohm Termination
10W ArraN9510 1
2 RF Power Meter Anritsu Sitemaster S400A or
Marconi 6970 1
3 Power Sensor Anritsu 560-7N50B or Marconi
6932 1
4 Attenuator for use with
Anritsu HP 8491 (N Type) 1
Test TX Output Power (Test 5)
Note: If adding a shelf to a rack that is already in service it is necessary to
remove the RF card for any shelf sharing the power amplifier in order to make
power measurements. This is best done when traffic loading is at its lowest
In order to commission the output power of the rack, a Power Meter must be
connected via a power sensor to the N-Type connector on the DIP/LNA at the top of
the rack. Protect the meter by connecting a 30dB attenuator (HP 8491) to the output
of the DIP/LNA as the output power can exceed 33dBm.
Note: The output from RF cards 1 and 2 is measured on DIP/LNA1. The output from
RF cards 3 and 4 is measured on the DIP/LNA2. If the AS4020 shelf has been added
to an existing rack then the RF card used must be inserted prior to measuring the shelf
power. The port not under test if not connected to an antenna should be terminated
with a 10W termination.
Measure the output of AS4020. (This test is repeated for other installed AS4020
shelves)
Connect RF meter via a 30dB attenuator on the antenna port to protect the power sensor
from damage.
Configure the AS4020 using the menus on the front panel. From the Top Menu >Setup
Menu >RF Menu set the following values:
Note: The PN code should always be set prior to entering commissioning mode.
RF Menu
TX Clipping 00101
Disable TX and RX False
Downlink Frequency Enter DL frequency kHz with leading 0 e.g 03522751