HP (Hewlett-Packard) E6380-90019 Cell Phone Accessories User Manual


 
Chapter 3 63
Overview of the Test Set’s Built-In Tools
Using RF Tools Program
Selecting Cable Type
In the menu for this test, you can enter the following information:
Cable length
Cable length units
Pressing the knob toggles the selection between feet and meters.
Cable class
Pressing the knob allows selection of Heliax, RG, and custom
options.
The next menu varies depending on the selection for cable class:
•If Custom is selected, you can enter the cable’s velocity of
propagation constant and attenuation per 100 feet (or meters).
The propagation velocity must be a value between 0 and 1.
•If RG is selected, you can enter the cable type with the example
[RG 58/U = 58]. You must enter a value between 0 and 1000.
•If Heliax is selected, you can enter the cable type. A list of
choices (foam, air, and flex of varying thickness) is displayed. Use
the knob to select the desired cable type.
•Press
k1 (or select Begin Test) when all the appropriate entries
have been made.
Connect the cables as instructed, and press
k1 (Proceed).
Velocity factors and attenuation. Cables that use polyethylene
dielectric typically have a propagation velocity of 0.66, cables that use a
teflon dielectric typically have a propagation velocity of 0.70. If the
cable attenuation is unknown, enter 0 dB per 100 feet (or meters).
Entering 0 dB/100 will produce return loss values lower than actual,
but fault distance can be accurately detected.
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