User's Manual Part 2

RBS 2109 User’s Guide

6. Observe the trace in the frequency range according to the table below.

Table 17 Measurement Frequency Range for Passive Antenna Systems (No

TMA)

System Start Freq. MHz Stop Freq. MHz

GSM 800

824 894

GSM 1900

1850 1990

7. Check that no SWR levels are over 1.4 (= 15.6 dB RL) between the

frequencies stated in the table above. For conversion between VSWR

and Return Loss see Table 20 on page 99. Enter the

test result

in the

test record. For examples of acceptable and unacceptable waveforms,

see figures below.

8. Create a unique trace name in accordance with Section 6.9 Naming an

SWR Measurement on page 95. Save the measurement by pressing the

SAVE DISPLAY key. Type in the trace name using the alphanumeric soft

keys, and press ENTER.

9. Repeat the SWR test for each feeder on the site.

Example of an Acceptable SWR Measurement

P010265A

CAL ON LIM ON 259 POINTS RECALL

2.00

1000.0FREQ (MHz)800.0

1.00

M3=OFFM1:1.03,889.9MHz

M4=OFFM2:1.19,959.7MHz

ALL

OFF

SWR ANTENNA 900

1.4

Figure 40 Example of an Acceptable SWR Measurement, GSM 900, No TMA

N/LZT 720 0090 Uen R1A 2004-09-17