CC1352P: Enabling PA for 431-527MHz band

Hi.

When you say you tried to enable the PA with rfPacketTx, what did you do? 

Regards, 
Vegard

The above two settings. I also got a new PA table in radio_config.h generated automatcally by sysconfig but I am not sure how to use this.

In this thread, TER says that he has the untested project files to set 20dBm for 433MHz band. Can I get those?

Because this project includes bulk manufacturing, I need to decide with the chip soon, whether to go for TI CC1352P or some other chips.

Moreover, the transmission is on amateur band - around 436 MHz. Hence, +20dBm is not restricted. If I can get an example project to do this, its a go for me.

Thanks

Hi

The untested project files are tuned for 470MHz-510MHz, so they won't necessary perform well at 436 MHz. But if you still want the project files, add me as a friend here on E2E.

Regarding enabling the PA on 433 MHz, this looks correct. What happens when you do this? What is the output power?

Regards, 
Vegard

Thank you Vegard,

I have added you as friend.

I did two tests -

1) rfPacketTx project, transmit at 13dBm -> Works fine, I get the RF output on 14dBm TX pins.

2) Same project, just the settings are changed to enable PA as shown in the pictures above. There is no RF output.

Just to make sure we are on the same page here. You said you have two antennas on the board. One for the PA path and one for the SUB-1G path. You switch which antenna you measure from between enabling the PA? 

Can you share Schematics and Gerbers?

Vegard

Yes, there are two antennas on the board. I do not have the schematics right now but i can share it when i get it.

The schematics is similar to that of launchxl CC1352P-4 except that there is no switch before the antenna, instead one antenna is connected to each RF line. For instance, something like this in the below picture (picture is only for representation).

In our board I am not expecting exactly 20 dBm on PA path. I know that impedance matching and other problems may be there but atleast I should get some output on PA line when PA is enabled. There is no even a faint signal on PA line for frequencies between 433 - 510 MHz. However, the PA line works for 868MHz or 915 MHz, and I see around 12dBm output there (12dBm because the PA is matched for 430-500 MHz band and not for 868/915 MHz while there is a drop of 8dBm)

I think the problem is with the software. Something to do with settings. I have recorded the video of tests that i am performing and I am using example programs. I have sent it as private message to you.

Test 1: Example program rfPacketTX from CC1352P1-4\TI Drivers\No RTOS with TX frequency set to 480MHz. Reception is tested using SDR

Test 2: Same as test 1 but with PA enabled.

Hi

I am trying to reproduce the problem here on my side, I will get back to you soon. 

Vegard

I could get 17.5 dBm by the way.

Alongside, I also used LAUNCHXL-P2 with SmartRF Studio V2.12. Even there I got 17.5dBm with the filter circuit on PA line matched to 2.4GHz.

So you are able to get 17.5 dBm when using the 20 dB setting with the PA at 436 MHz?

Vegard