PC with SmartRF Studio

installed

SmartRF Eval Board

and Eval Module

SmartRF Eval Board

and Eval Module

TX

RX

Shielded Box

Variable

Attenuator

1

2

Sum

Combiner

(1)

RF Generator

RF Out

Ext 1 In

Receive Testing Without LabVIEW

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6.3

Interference Testing with RF Generator

Purpose: To verify that the receiver sensitivity conforms to the published standards.

Pass Condition: See respective standards document for specifications and pass conditions.

Test Environment: Figure 13 illustrates the test setup for interference testing with an RF generator.

(1)

3-dB loss in signal on each input path through the combiner.

Figure 13. Interference Testing with RF Generator Setup

Procedure:

Step 1.

Connect the instruments and test board as shown in Figure 13.

Step 2.

The TX and RX boards must be set up as for the sensitivity test.

Step 3.

The interference signal is set up by using a continuous, unmodulated signal where the

frequency can be different from TX and RX unless testing for co-channel interference.

Step 4.

Set the output power of the TX such that the received power at the RX end is 10 dB above

the sensitivity threshold obtained from sensitivity testing. (Remove 10 dB of attenuation from

the attenuators after completing the sensitivity test.)

Step 5.

Set the output power low for the interference signal initially, and perform the sensitivity test at

the RX.

Step 6.

Continue to increase the output power of the interference signal until the PER is greater than

1%. The difference between the TX and INT power measured at the RX side indicates the

ability of the CCxxxx device to overcome interference.

20

Basic RF Testing of CCxxxx Devices

SWRA370

– August 2011

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