Previously a tune up tone was not generated if the first period on a
new band was going to be a Tx period, this is no longer so and thus
allows low (or high) power tune tones as set up by the user. Note that
tune up tones are still not sent for bands flagged as Rx Only in the
band hopping schedule, this is to protect active aerials and avoid
unintended transmissions on unlicensed bands.