WL18XXCOM82SDMMC: RTTT wireless tool GUI questions

Hello Vihang,

I just want to follow up with you. It's kind of urgent.

Thanks,

Joe

Hi Joe,

Please see my responses below:

1.  What is ESG mentioned in the RTTT doc?

When you set up the device to operating in RX mode, you require a source in order to be the transmitter. This is what the ESG is referring too. It does not particularly need to be an ESG, but something that can generate the modulation you are interested in. So you will have the U.FL connector connected to the ESG and the WL18xx device connected to the PC running RTTT via the USB cable. the ESG will be your transmitter and then you use the RX tab on the RTTT tool to see what the WL18xx is receiving.

2. I've tested Tx output power at 30 dBm under the insruction, please see the picture. I only got -22 dBm output at 20MHz bandwidth, is that a expected value with this setup? Any reference for me to take a look?

Although the overall output power is set to 30dBm, the radio is not capable of this. The max output power is around 16-18dBm. How are you performing the measurement? You should have a Spectrum analyser connected to the RF out port of the WL18xx board. Then you can run the RTTT in TX mode and then the SA will show you the signal. Note that you will need to use max hold on the SA to see the signal as you will not get a good measurement otherwise. IF you are using a power meter, you need to account for the duty cycle in the measurement as it will not be a continuously transmitted signal as even in continuous mode it is not 100%.

3. I am doing it for verification purpose the FCC regulation. Please give some suggestion if you can.

We have our FCC test reports at: http://processors.wiki.ti.com/index.php/WL18xxMOD_Certification_Reports. This is a great reference to see how the measurements are done.

Please let me know if you have any further questions.

Thanks,

Riz

Thank you so much! Very helpful!