Sanity check the Radio freq and channel IFs for all conf files

[jpmeijers]

It has happened a few times that there were configuration issues due to incorrect config files. We need to double check the radio0 and radio1 frequencies, as well as the IF offsets applied to them. According to the sx1257 the radio only has a 800kHz bandwidth, meaning we should use IF offsets of less than +-400. The channel's width should also be taken into account, and the channel, plus it's width should fit inside the sx1257's bandwidth.