Bird Technologies AT-500-Manual - Manual (Page 37)

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Chapter 4 Measure Match
Understanding the Operating Modes
The Antenna Tester is connected and the operating
frequency band is selected. User selections are custom-
ized, the power is on, and the top level menu is dis-
played (see “Basic Operations” on page 9).
Since the AT-500 will change the way antennas are
tested, Bird recommends taking some time to explore
the different operating modes and find what is best for
specific applications.
Swept Frequency vs. Single Frequency
Swept frequency graphically displays the unit of mea-
sure over a band of frequencies. The cursor, a vertical
dotted line, can be moved with the arrow keys to pin-
point a particular frequency. The measured match
value and the frequency at the cursor position are
shown at the top of the display.
Figure 5 Swept Frequency
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.
Swept
Freq Single
Freq Util Test
VSWR
1.5
1.2
2.00 MHz 136.00
*
1.35
69.00 MHz
Field
Str