Bird Technologies AT-500-Manual - Manual (Page 55)

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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 2 to 136MHz. This is a relative mea-
surement. The measurement sensitivity is such that a
full scale deflection will occur for a field of 8 Volts/Meter
at 100 MHz. The gain factor can be adjusted to increase
the measurement sensitivity to 0.08 Volts/Meter.
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.