Out-Of-Band Spurious Emissions; Out-Of-Band Spurious Emission Measurement - Anritsu spectrum master ms2711d User Manual

Out-of-Band Spurious Emissions

Out-of-band spurious measurements are made on signals outside the system main band.
These signals, which can interfere with other communication systems, can be categorized
into harmonics and random spurious emissions. Real time monitoring of spurious emissions
from a transmitter can uncover unwanted signals before they interfere with other channels.
Figure 5-8. Example of In- and Out-of Bandwidth Signals

Out-of-Band Spurious Emission Measurement

Required Equipment
MS2711D Handheld Spectrum Analyzer
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Test Port extension cable, Anritsu 15NNF50 – 1.5C
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Procedure
Step 1. Reset the MS2711D to the factory default settings for the current mode by press-
ing the RECALL SETUP key on the data keypad. When the key is pressed, a
Recall Setup selection box appears on the display. Select setup location 0 <De-
fault> to recall the factory preset state for the currently selected mode.
Step 2. Using the test port extension cable, connect the signal source to the input of the
attenuator, and connect the output of the attenuator to the RF In test port of the
MS2711D.
Step 3. Press the FREQ/SPAN key and select the Center soft key. Enter the center fre-
quency.
Step 4. Press the Span soft key. Set the span wide enough to include the primary chan-
nel bandwidth and upper and lower channel bandwidths.
Step 5. Press the AMPLITUDE key and select the Ref Level soft key to set the refer-
ence level to –20 dBm.
Step 6. Press the Atten/Preamp soft key and set the attenuation to Auto.
Step 7. Press the BW/SWEEP key and press the Bandwidth soft key. Use the RBW
Manual and VBW Manual soft keys to set the resolution bandwidth to 3 kHz
and the video bandwidth to 300 Hz.
Step 8. Press the MARKER key and press the M1 soft key.
Step 9. Press the EDIT soft key. Use the Up/Down arrow key to move the marker over
the carrier. Press the ENTER key to set the marker.
IN BAND
OUT OF BAND
Chapter 5 Field Measurements
OUT OF BAND
5-15