I found something odd about the details of the PaConfig settings for the RFM95W device at address 0x09. Referring page 103 of the data sheet there appears to be a conflict between the MaxPower setting (bits6-4) and the OutPower (bits3-0).
I want to use the PA_Boost pin in order to get to +17dBm. Fine, I set bit 7 to 1, and bits 3-0 to 0xF. This gives +17dBm for Pout.
However, the MaxPower setting uses bits 6-4. For three bits the largest possible value is 07. Using the given formula of Pmax = 10.8+0.6*7 results in a MaxPower of only +15 dBm.
Am I missing something or is there a typo in the formula?. It would work if the multiplier 0.6 were increased to a value of about 1.3. Then Max Power would +20dBm .
This message was edited 1 time. Last update was at 16/12/2014 16:16:57