Hello folks!,
I've discovered a tool from Semtech that comes with the eval board of SX1231.
http://www.semtech.com/images/datasheet/sx1231starter-kit-setup.exeThis tool comes with menus and options greyed out if there is no device connected. BUT if you press
CTRL + ALT + N the menues activate successfully!
I think this tool will help others to tune or figure out RFM69 registers. Beware, these are not the same radios but since hoperf RFM69HW is based on Semtech SX1231 probably will work, a quick look to the software reveals that the registers and values are the same for both radios.
Hope is useful, just my 2 cents here..