Anritsu S113C Guide de l'utilisateur télécharger pdf (Page 95)

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.

Out-of-Band Spurious Emission Measurement

Required Equipment

Site Master S114C/S332C

30 dB, 50 watt, Bi-Directional, DC – 18 GHz, N(m) – N(f), Attenuator,

Anritsu 42N50A-30

r Test Port extension cable, Anritsu 15NNF50 – 1.5C

Procedure

Step 1. Reset the Site Master to the factory default settings if a known starting state is

desired.

If the unit is off, hold down the ESC/CLEAR key while pressing the ON/OFF

key.

If the unit is already on, press the RECALL SETUP key on the data keypad.

When the key is pressed, a Recall Trace selection box appears on the display.

Select setup location 0 to recall the factory preset state.

Step 2. Using the test port extension cable and 30 dB attenuator, 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 Site Master.

Step 3.

Press the FREQ/DIST key and select the

CENTER soft key. Enter the center

frequency.

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 0 dBm.

Step 6. Press the

ATTEN soft key and set the attenuation to AUTO.

Step 7.

Press the SWEEP key and select the

RBW and VBW soft keys to set the resolu

tion bandwidth to 10 kHz and the video bandwidth to 300 Hz.

Step 8.

Press the MARKER key and press the

M1 soft key.

5-23

Chapter 5 Spectrum Analyzer Measurements

OUT OF BANDOUT OF BAND

IN BAND

Figure 5-15. Example of In- and Out-of Bandwidth Signals

1 2 ... 90 91 92 93 94 95 96 97 98 99 100 ... 119 120

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