f4exb/sdrangel v4.21.2

VS2019 and NFM changes

on GitHub

Windows package: upgrade to VS2019

Thanks to a contribution of Kasper kasper93 the Windows build in Appveyor has been upgraded to VS2019 and therefore Qt 5.15.1. Builds are now using Ninja

NFM changes

Also thanks to Kasper kasper93 the audio scaling in NFM has been cleaned up so that now 100% volume should be nominal for the given frequency deviation. Consequently bandwidths and nominal deviations have been reviewed with 10, 12.5 and 15 kHz removed and replaced by 11 kHz (11F3 for 12.5 kHz channel spacing) and 16 kHz (16F3 for 25 kHz channel spacing). The deviation of the modulator has been reworked to actually match nominal deviation at 2.5 kHz.

This may result in a louder audio volume than before so you may want to readjust the volume from the previous settings. The volume control has been changed to be expressed in percentage of nominal volume (at nominal deviation) ranging from 0 to 200%.

Other changes and fixes

• Development based on Ubuntu 20.10. This will be reflected in the compilation instructions in the Wiki. Ubuntu 20.04 has two annoying bugs reported in #615 and #600 resolved by Qt 5.14.2 and kernel 5.8 respectively
• KiwiSDR: fixed issue in local network. Fixes #435