R400 v1.9

Increased modulation acceptance in 200 series emulation mode to prevent clipping when transmitter driven deep into limiting.

R400 v1.7

Fixed bug causing receiver output polarity to be reversed with respect to signal polarity on transmitter.

R400 v1.5

Added "SmartTuning" feature which automatically selects a point in the tuning range that is optimal for use as the frequency of operation.

R400 v1.0

First production release.