Wojciech Tryc

Important changes to forums and questions

All forums and questions are now archived. To start a new conversation or read the latest updates go to forums.mbed.com.

8 years, 5 months ago.

Rx Frequency: 903700000

AT&V shows that Rx Frequency is always 903700000 This is regardless which sub-band I will select for Tx (I am in North America) I am confused as 903700000 is Rx frequency in the 1 sub-band (last band). Could you please explain? W.

Question relating to:

Last updated: 18 Nov 2016
Library for LoRa communication using MultiTech MDOT. Lora, mdot, multitech

1 Answer

Jason Reiss
8 years, 5 months ago.

The Rx Frequency in the configuration and which is set by the AT+RXF command is not what is used in RX window 1 and 2. The radio frequency used after a send is determined by the transmit frequency and public or private mode. To communicate with the a LoRaWAN gateway the software is setting the Rx parameters to allow communication.

Accepted Answer

Thanks Jason, this is exactly how I expect it. But still that 903700000 is not clear to me, why is it even there? Are you saying that Rx freq is required to be set to something but then the actual Rx Freq is determine at runtime?

posted by Wojciech Tryc 20 Nov 2015

It is not required to be set at all. The AT+RXF command can be used for testing the Sx1272 radio but it is not used with LoRaWAN communication.

posted by Jason Reiss 20 Nov 2015

Thank you for solving this mystery ;) Have a wonderful day

posted by Wojciech Tryc 20 Nov 2015