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Chapter 5 Field Strength
Field Strength Measurement
With the field strength antenna installed, the Antenna
Tester can be used to optimize the radiated signal of any
transmitter from 65 to 520MHz. This is a relative
measurement. The measurement sensitivity is such that a
full scale deflection will occur for a field of 0.22 Volts/Meter
at 400 MHz. The gain factor can be adjusted to increase the
measurement sensitivity to 0.02 Volts/Meter. Sensitivity at
other frequencies can be estimated by observing the return
loss display with the field strength antenna installed.
Turn Audio On/Off
The pitch varies with the field strength.
y Press the MENU key.
y Press the FIELD STR key.
y Pressing the AUDIO key toggles between on and off.
Enter Gain Factor / Select Auto Gain
Increasing the gain factor increases the measurement
sensitivity. Setting the gain to auto will set a gain factor so
that the pointer is in the middle of the scale.
y Press the MENU key.
y Press the FIELD STR key.
y Press either:
AUTO GAIN- the pointer moves to the approximate middle
of the scale.
GAIN- The cursor will blink on the gain value. Enter the
desired value using the numeric keypad or change the
value using the UP/DOWN arrow keys. Press the ENTER
key.