Cellular Antenna Quick Start Guide
Cable
Fault Location
Start Distance
Stop Distance
Cable
Fault Location
Band Pass
Center Frequency
MHz
Full Band Cal
Fault Loc Frequency
Band Pass Max Span
MHz
System Bandwidth
Narrow 250 Hz
HP 8712ET/ES and HP 8714ET/ES
HP Part Number 08714-90022
Printed in USA October 1998
© Copyright 1998 Hewlett-Packard Company
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 HP 8712ET or HP 8714ET . If you are using an HP 8712ES or
HP 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
XX
ENTER
XX
ENTER
2. Reduce the interference. 3. Calibrate the analyzer.
CAL
BEGIN
900
FREQ
300
AVG
-1-
4. Connect the equipment. 5. Interpret the measurement / save results.
Marker Search
Max Search
Mkr−> Max
Define Save
Data ON
Prior Menu
Save State
Velocity Factor
Cable Loss
MARKER
SAVE RECALL
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 Solution
The measured amplitude and distance of a 1000
ft. cable are wrong. (Cable is not terminated in
this example.)
Change the “velocity factor” and “cable loss”
values to the values specified by the cable
manufacturer.
CAL
-2-
To Make a Return Loss Measurement
Reflection
S11
System Bandwidth
Narrow 250 Hz
1-Port
User 1-Port
Marker Search
Min Search
Mkr−> Min
Define Save
Data ON
Prior Menu
Save State
SWR
Scale/Div
Save State
1. Choose the measurement parameters or recall an instrument state.
PRESET MEAS 1
(or )
AVG
2. Calibrate the analyzer. 3. Connect the equipment.
CAL
(or )
4. Interpret the measurement / save results. 5. View SWR / save results.
MARKER
FORMAT
ENTER
SCALE
0.2
SAVE RECALL
SAVE RECALL
-3-
To Make an Insertion Loss Measurement
Reflection
S11
System Bandwidth
Narrow 250 Hz
1-Port
User 1-Port
MHz
Define Save
Data ON
Prior Menu
Save State
1. Choose the measurement parameters or recall an
instrument state.
PRESET MEAS 1
(or )
AVG
2. Calibrate the analyzer. 3. Connect the
equipment.
CAL
(or )
4. Interpret the measurement / save results. 5. Calculate insertion loss and end of cable.
MARKER 900
SAVE RECALL
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 = 10 MHz between bumps
V
(velocity factor) ≈ 1.0
f
c ≈ 10
λ = 10
= 100 ft ÷ 2 = 50 ft
-4-
÷∆f
f
9
ft/sec
9
ft/sec ÷ 107 cycles/sec = 100 ft
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