User Manual

Transmit & Receive Antenna VSWR – continued
PRELIMINARY 2
SC 4812ET BTS Optimization/ATP – CDMA LMF
July 1999
3-82
Equipment Setup – Advantest
Test Set
Follow the steps outlined in Table 3-47 to set up test equipment required
to measure and calculate the VSWR for each antenna.
Table 3-47: VSWR Measurement Procedure – Advantest Test Set
Step Action ADVANTEST
1 For manual VSWR testing using external directional coupler, refer to Figure 3-26.
– Connect the communications test set RF OUT port to the input port of the directional coupler.
– Connect the INPUT port of the communication test set to the forward port on the directional
coupler. Terminate the forward port with a 50 ohm load.
– Connect the RF short to the directional coupler output port.
2 Preform the following to instruct the calibrated test set to generate a CDMA RF carrier (RVL call)
with all zero longcode at the assigned RX frequency at –10 dBm.
 Push the ADVANCE Measurement key.
 Push the CDMA Sig CRT menu key.
 Push the FREQ Entry key; set RF Gen Freq to center frequency of actual CDMA carrier between
1930–1990 MHz for TX and 1850–1910 MHz for RX.
 Push the LEVEL Entry key; set to 0 dBm (by entering 0 and pushing the –dBm key).
 Verify that ON is active in the Output CRT menu key.
 Verify that OFF is active in the Mod CRT menu key.
 Push the CW Measurement key.
 Push the FREQ Entry key.
– Push the more 1/2 CRT menu key.
– Set Preselect CRT menu key to 3.0G.
 Push the Transient Measurement key.
– Push the Tx Power CRT menu key.
– Push the LEVEL entry key (set to 7 dBm by entering 7 and pushing the the dBm key).
– Set Avg Times CRT menu key to ON. Set to 20 (by entering 20 and pushing the Hz ENTER
key).
 Push the REPEAT Start key to take the measurement.
3 Record the Burst Power display on the communications analyzer and Note as P
S
for reference.
4 Install the antenna feedline to the output port of the directional coupler.
5
 Push the Auto Level Set CRT menu key.
 Push the REPEAT Start key to take the measurement.
6 Record the Burst Power on the communications analyzer and Note as P
A
level for reference.
Record the difference of the two readings in dBm.
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