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 8-5 illustrates the interference test setup.

Figure 8-5 Interference Testing Setup Diagram

Figure 8-6 Interference Testing Bench Setup - Overview

Figure 8-7 Interference Testing Bench Setup - Shielded Box

Figure 8-8 Interference Testing Bench Setup - TX and interferer connections

Procedure:

• Step 1: Connect the instruments as shown on Figure 8-5, Figure 8-6, Figure 8-7, and Figure 8-8.
• Step 2: Use the same configuration from the sensitivity test 8.1, for the TX and RX boards.
• Step 3: Setup the INT (interference) board as a transmitter; however, the frequency can be different than that of either the TX and RX signals. If testing for co-channel interference, the frequency should be the same, otherwise, frequency should vary. Furthermore, unlike the TX that transmits packets, the INT transmits continuously (that is, it is a continuous modulated signal).
• Step 4: Set the output power of the TX such that the received power at the RX end is 10dB above the sensitivity threshold obtained from sensitivity testing. This is also dependent on the standard. (Remove 10dB of attenuation from the attenuators after completing the sensitivity test.)
• Step 5: Initially, set the output power of the INT board to the lowesr output power setting possible and start transmitting.
• Step 6: Perform the sensitivity test between the RX and TX board and notate the PER. Continue to increase the output power of the INT until the PER, displayed on the RX side, is greater than 1%. The difference between the TX and INT power measured on the RX side indicates the ability of the CCxxxx device to overcome interference.