Chapter 4 — Spectrum Analyzer 4-27 Measure
MS20xxA VNA Master UG 10580-00166 Rev. C 4-49
ACPR
Accesses a menu of Adjacent Channel Power Ratio measurement options:
On Off
Begins or ends the ACPR measurement.
Main Ch BW
Sets the bandwidth of the main channel for ACPR measurement. Use the keypad,
the directional arrow keys or the rotary knob to enter the a specific frequency.
When using the keypad, select the
GHz, MHz, kHz, or Hz soft key to accept the
frequency input. Changing this value automatically changes the adjacent
channel bandwidth and channel spacing.
Adj Ch BW
Sets the bandwidth of the adjacent channels for ACPR measurement. Use the
keypad, the directional arrow keys or the rotary knob to enter the a specific
frequency. When using the keypad, select the
GHz, MHz, kHz, or Hz soft key to
accept the frequency input.
Ch Spacing
Sets the channel spacing between the main and adjacent channels. Use the
keypad, the directional arrow keys or the rotary knob to enter the a specific
frequency. When using the keypad, select the
GHz, MHz, kHz, or Hz soft key to
accept the frequency input. This value must be greater than or equal to half of
the main channel bandwidth, plus half of the adjacent channel bandwidth.
Back
Returns to the previous menu.
AM/FM Demod
The user can select AM, Narrow Band FM (300 µs de-emphasis), Wide Band FM (50 µs
de-emphasis), Upper Sideband or Lower Sideband.
On Off
Turns AM/FM Demodulation on or off.
Demod Type
Provides soft keys to select the type of signal to be demodulated:
FM Wide Band
FM Narrow Band
AM
USB
LSB
Demod Freq
Use the keypad, the directional arrow keys or the rotary knob to enter the center
frequency of the signal to be demodulated. This frequency does not have to be
within the current frequency sweep range to which the instrument is set.
Demod Time
Use the keypad, the directional arrow keys or the rotary knob to increase or
decrease the demodulation time, and press the
Enter key to select. The
demodulation time can be set from 100 milliseconds to 500 seconds. The
10580-00166C.book Page 49 Thursday, February 21, 2008 12:52 PM
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