Bird Technologies AT-800-Manual - Manual (Page 57)

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Chapter 5 Field Strength
Field Strength Measurement
With the field strength antenna installed, the Antenna
Tester can be used to verify the output of portable cel-
lular phones with fixed antennas. This is a relative
measurement. The measurement sensitivity is such
that a full scale deflection will occur at about three
meters from a source that is radiating 12.6 watts effec-
tive radiated power (ERP). The gain factor can be
adjusted to increase the measurement sensitivity.
Turn Audio On/Off
The pitch varies with the field strength.
1. Press the MENU key.
2. Press the FIELD STR key.
3. 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 fac-
tor so that the pointer is in the middle of the scale.
1. Press the MENU key.
2. Press the FIELD STR key.
3. 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.