To closely audit the radio frequency performance, Wi-Fi demodulator is used to analyze data from the CC33xx device. A LitePoint® is utilized in this scenario to observe the PHY performance, but any 802.11 vector signal analyzer should work.

Figure 3-1 Example Setup for Performance Testing

1. Refer to 1 through 3 in the 'SDIO Interface' section to set up Calibrator Tool.
2. Start setting up the transmitting functions by tuning the specifying the band and channel. For this example, channel 6 is used.

   calibrator wlan0 cc33xx_plt tune_channel 6 0 0

3. Set TX parameters. Sample code is provided below with the used parameters defined in the Table 3-1. For more information and other parameter options, see the SimpleLink™ CC33xx Calibrator Tool User's Guide (SWRU602).
   Table 3-1 'set_tx' Command Specifications

   Parameter	Setting	Calibrator Tool Code
   Preamble Type	11b Long	1
   Phy Rate	DSSS (1 Mbps)	1
   TX Power	20 dBm	30
   Delay	1000 µS	1000
   Packet Mode	Continuous	0

   calibrator wlan0 cc33xx_plt set_tx -preamble_type 1 -phy_rate 1 -tx_power 30 -delay 1000 -pkt_mode 0

   Sample output:

   set_tx_params has been called with: 5 Parameters
   Calibrator:: Setting TX Parameters

4. Start TX transmission.

   calibrator wlan0 cc33xx_plt start_tx

   Sample output:

   Calibrator:: Starting TX Simulation

5. Evaluate TX results and compare results to datasheet specification. Figure 3-2 shows example results when the CC33xx device is transmitting DSSS (1 Mbps) at 20 dBm (these settings were established in 3). Every system is different, so it is advised to understand the amount of potential power loss that can occur within the system under test. In this scenario, a loss of 2.2dB is expected. If the measured results meet requirements for the product line, then the TX performance for both Wi-Fi and Bluetooth® can be ensured.
   Figure 3-2 LitePoint Example Results From TX Performance Testing
6. After review, stop the device transmission to complete testing.

   calibrator wlan0 cc33xx_plt stop_tx