Troubleshooting Issues with Two RFM Modules on STM32F746ZGT6 MCU

[mrkayaalp]

Hello everyone, currently, we are working on a PCB that incorporates 2 RFM98PW modules and using STM32F746ZGT6 as MCU . Our intended usage for these modules is solely in receive mode, operating at different frequencies. However, we are encountering an issue where the modules do not function properly when their configurations differ. When both modules are set to the same configuration, they work flawlessly.

At this point, we are unsure whether the problem lies in the hardware design or the software implementation. We have thoroughly examined our software code, and it appears to be correct based on the modules' specifications. Nevertheless, we cannot rule out the possibility of a hardware issue that might be causing the problem.

We would greatly appreciate any insights or suggestions that could help us diagnose and resolve the root cause of this issue. Thank you for your assistance!

 

[RhSilicon]

If it is a question of interference between modules (maybe phase related), it may be interesting to search for ISM band, for example files like these:

[System Design Considerations for a ZigBee RF Receiver with regard to Coexistence with Wireless Devices in the 2.4GHz ISM-band] https://koreascience.kr/article/JAKO200822050666668.pdf

[Design of Dual ISM Bands Low Power Rectenna for Indoor Wireless Power Transfer Application] http://www.ijeetc.com/2023/IJEETC-V12N1-60.pdf