AIRSCOUT SPECTRUM
11
Tempo Communications Inc.
1390 Aspen Way • Vista, CA 92081 USA • 800-642-2155
The current SPAN is displayed in white. The color of keypad buttons shows which numbers can be entered at the
current digit position to obtain a valid parameter value – the numbers on the
green
buttons can be entered, the numbers on
the
red
buttons cannot be entered. If the currently entered value is valid, it is displayed in
green
(also OK button is
green
).
If the value is not valid, it is displayed in
red
(also OK button is
red
). To confirm a valid value, tap the OK button or tap the
parameter’s box.
The frequency value can be entered with a precision of 0.01 MHz (10 kHz) by using the “.” on the keypad. To input a
value with decimal digits, first enter the full MHz’s, then tap the “.” button and enter the rest of the digits. Until the value is
confirmed, the digits after the point are displayed larger. If there are no digits displayed after the point, it means that they
are zeroes.
2.4 Span
The SPAN menu allows selecting the range of the horizontal axis (difference between START and STOP frequencies)
i.e. span, in megahertz (MHz).
While at the SPAN menu, tapping the right part of the graph decreases SPAN (zooms in), and tapping
the left part of the graph increases SPAN (zooms out). Sliding the graph to the right or to the left
modifies START and STOP frequencies by equal amounts, keeping the SPAN constant.
Modifying SPAN preserves CENTER frequency, if possible, but alters START and STOP frequencies. Tapping the MIN
SPAN or FULL SPAN button instantly sets SPAN to respectively minimum or maximum allowed value. If the current SPAN
value is the actual minimum or maximum, the corresponding button will be
green
. FULL SPAN is enabled by default.
The AUTO function at the
RBW & VBW
menu automatically adjusts resolution and video bandwidths
depending on the selected SPAN. AUTO ensures optimum use of the filters. AUTO is enabled by
default.
The minimum allowed SPAN differs for each of the resolution bandwidths – 0.5 MHz for 10 kHz RBW,
1.5 MHz for 30 kHz RBW, 5 MHz for 100 kHz RBW, 15 MHz for 300 kHz RBW, and 50 MHz for 1 MHz RBW.
The maximum allowed SPAN for MIN/MAXHOLD trace
Table3
AirScout Spectrum Frequency Range
0.3-3 GHz
2-8 GHz
24-40 GHz
Resolution bandwidth setting
RBW
10
kHz 200
MHz
N/A
N/A
RBW 30 kHz
N/A
200 MHz
200 MHz
RBW 30 kHz
900 MHz
N/A
N/A
RBW 100 kHz
N/A
900 MHz
3000 MHz
RBW
300
kHz
N/A
N/A
9000
MHz
