Anritsu S113C Guia do Utilizador descarregar pdf (Página 97)

In-band/Out-of-Channel Measurements

The in-band/out-of-channel measurements are those measurements that measure distortion

and interference within the system band, but outside of the transmitting channel. These

measurements include (1) in-band spurious emissions and (2) adjacent channel power ratio

(also called spectral regrowth). There are stringent regulatory controls on the amount of in

terference that a transmitter can spill to neighboring channels. In order to determine compli

ance with the allowable level of spurious emissions, two parameters need to be specified:

Measurement channel bandwidth

Allowable level of spurious emissions

In-band Spurious Measurement

Required Equipment

Site Master S114C/S332C

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

Anritsu 42N50A-30

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, 50 watt, Bi-directional attenuator,

connect the Site Master to appropriate transmit test port.

Step 3.

Press the FREQ/DIST key and select the

CENTER soft key. Enter the center

frequency.

Step 4.

Press the FREQ/DIST key and select the

SPAN soft key. Set the span wide

enough to include the primary channel 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.

Step 9. Press the

EDIT soft key. Use the Up/down arrow key to move the marker over

one of the spurs. Press the ENTER key to set the marker.

Step 10. Compare the value of the marker to the specified allowable level of

in-band/out-of-channel spurious emissions for the corresponding channel trans

mit frequency.

5-25

Chapter 5 Spectrum Analyzer Measurements

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