AR7030 Plus is an extended version of the "normal" AR7030. Just
better parts were used, like the VFO-Encoder by Bourns, which is
much better than the old Alps-Encoder. But in my opinion this new
encoder has too many impulses per turn. As soon as it is turned
slightly faster, the desired frequency is easily missed. This also
correlates with the too heavy flywheel effect. On the "Plus" version,
also the firmware has been updated. Therefore an accessory board can
be installed, which includes a noise blanker and a notch filter.