User's Manual Part 2

RBS 2109 User’s Guide
2. Ensure that the test equipment is connected according to Section 6.3.1
Connecting DTF Test Setup on page 79.
3. Press the FREQ/DIST key to set the frequency.
4. Press the D1 soft key, enter the desired
start value
(usually 0.0 m) and
press ENTER.
5. Press the D2 soft key, enter the desired
stop value
(usually a slight
overestimation of the total length of the feeder system) and press ENTER.
6. Press the AMPLITUDE key to set the scale.
7. Press the TOP soft key, enter
1.2
and press ENTER.
8. Press the LIMIT EDIT soft key and enter
1.05
. Press ENTER.
Note: Ensure that Limit is ON by pressing the LIMIT ON/OFF soft key.
9. Wait while the Site Master is calculating (6 to 22 seconds depending on
selected display resolution).
10. Observe the waveform. Examples of acceptable and unacceptable DTF
measurement results are shown in the figures below.
11. Check that no reflections are above 1.05 SWR (31.5 dB Return Loss). See
Table 20 on page 99, if necessary.
Example of an Acceptable DTF Measurement
P007951A
CAL ON LIM ON 259 POINTS RECALL
1.20
ON/OFF
50.0DIST (m)
0.0
1.00
EDIT
DELTA
(M2 - M1)
MARKER
TO
PEAK
BACK
M3=OFF
M4=OFF
DTF DTF1
MARKER
TO
VALLEY
M1:1.01,2.3m
:+0.07, +38.6m
2
Figure 35 Example of an Acceptable DTF Measurement
81EN/LZT 720 0090 Uen R1A 2004-09-17