Bird Technologies AT-400 - Manual (Page 29)

17
Chapter 4 Measure Match
Understanding the Operating Modes
The Antenna Tester is connected and the operating
frequency band is selected (see basic operation). User
selections are customized, the power is on, and the top level
menu is displayed (also in basic operation). Now what?
Before we explain how to measure the antenna match, a
brief discussion of your options is in order.
Since the AT-400 will change the way you test antennas, we
suggest taking some time to explore the different operating
modes and find what is best for your application.
Swept Frequency vs. Single Frequency
Swept frequency graphically displays the unit of measure
over a band of frequencies. The cursor, a vertical dotted line,
can be moved with the arrow keys to pinpoint a particular
frequency. The measured match value and the frequency at
the cursor position are shown at the top of the display.
Single Frequency mode displays the unit of measure in a
simulated analog meter graphic. This mode, particularly
when audio is on, is useful when tuning an antenna.
Figure 4
Swept
Frequency
Swept
Freq Single
Freq Util Test
VSWR
1.5
1.2
65.00 MHz 520.00
*
1.35
260.00 MHz
Field
Str