According to this design reference:
http://www.hoperf.com/upload/rf_app/RFM23BP_hardware_design_reference.pdf
The RFM23BP should be powered at 5V but it's SPI interface will run at 3.3V. This conflicts with the information in the RFM23BP data sheet:
http://www.hoperf.com/upload/rf/RFM23BP.pdf
I have been having problems with this in my testing and it looks like the SPI interface is operating at the VCC level (5V). Can you provide any more information?
Thanks,
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