@platenspeler, Nice!
I recently had a discussion because there was some confusion about the frequency range of the HopeRFM96. In the datasheet you will find this information:
1.2. Product Versions
The features of the three product variants are detailed in the following table.
Table 48
RFM96W/RFM98W 433/470MHz 6- 12 7.8 - 500 kHz .018 - 37.5 kbps -111 to -148 dBm
...but I see that you also use the RFM96 ..