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Cellular Antenna Quick Start Guide
Agilent Technologies
8712ET/ES and 8714ET/ES
Agilent Part Number 08714-90022
Printed in USA June 2000
Supersedes October 1998
© Copyright 1998–2000 Agilent Technologies, Inc.
This quick start guide provides basic instructions on how to verify the performance of cellular antenna systems. Refer to the Option 100 Fault Location and Structural Return Loss Measurement User’s Guide
Supplement for more detailed information. Also, please refer to your analyzer’s User’s Guide for safety, warranty, and assistance information.
NOTE This quick start guide assumes the use of an 8712ET or 8714ET. If you are using an 8712ES or 8714ES, some key presses and displays will be slightly different.
To Make a Fault Location Measurement
1. Choose the measurement parameters or recall an instrument state.
PRESET BEGIN Cable Fault Location
Start Distance XX ENTER Stop Distance XX ENTER
2. Reduce the interference.
3. Calibrate the analyzer.
CAL Full Band Cal
BEGIN Cable Fault Location
Band Pass Center Frequency 900
MHz
FREQ Fault Loc Frequency
Band Pass Max Span 300 MHz
AVG System Bandwidth
Narrow 250 Hz
-1-
4. Connect the equipment.
5. Interpret the measurement / save results.
MARKER Marker Search Max Search
Mkr − > Max
Search
SAVE RECALL Define Save Data ON
Prior Menu Save State
If Measurement Results Were Poor
The following results indicate a specific problem you may encounter. Refer to your Option 100 User’s
Guide Supplement for more information.
Problem
The measured amplitude and distance of a 1000 ft. cable are wrong. (Cable is not terminated in this example.)
Solution
Change the “velocity factor” and “cable loss” values to the values specified by the cable manufacturer.
-2-
CAL Velocity Factor Cable Loss
To Make a Return Loss Measurement
1. Choose the measurement parameters or recall an instrument state.
PRESET MEAS 1 Reflection (or S11 ) AVG System Bandwidth Narrow 250 Hz
2. Calibrate the analyzer.
3. Connect the equipment.
CAL 1-Port (or User 1-Port )
4. Interpret the measurement / save results.
5. View SWR / save results.
MARKER Marker Search Min Search
Mkr − > Min
FORMAT SWR SCALE Scale/Div 0.2
ENTER
SAVE RECALL Define Save Data ON
Prior Menu Save State
-3-
SAVE RECALL Save State
To Make an Insertion Loss Measurement
1. Choose the measurement parameters or recall an instrument state.
PRESET MEAS 1 Reflection (or S11 ) AVG
System Bandwidth Narrow 250 Hz
2. Calibrate the analyzer.
3. Connect the equipment.
CAL 1-Port (or User 1-Port )
4. Interpret the measurement / save results.
5. Calculate insertion loss and end of cable.
MARKER 900 MHz
SAVE RECALL Define Save Data ON
Prior Menu Save State
Insertion Loss Calculation
= marker value ÷ 2
= 7.36 dB
÷
2 = 3.68 dB
End of Cable Calculation
=
λ ÷ 2 where:
λ (wavelength) = c × V f
÷ ∆ f
∆ f = 10 MHz between bumps
V f
(velocity factor)
≈ 1.0
c ≈ 10
9
ft/sec
λ
= 10
9
ft/sec
÷
10
7
cycles/sec = 100 ft
= 100 ft
÷
2 = 50 ft
-4-
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