Dynon Avionics SkyView Pilots Users Guide - Manual (Page 215)

COM Radio Operation
SkyView Pilot’s User Guide - Revision S 11-13
External Flip/Flop
If you have an external flip/flop switch connected (typically to your control stick or yoke),
pressing it flip/flops the active and standby frequencies just like pressing the dual concentric
knob does. See the SkyView System Installation guide for details on connecting an external
flip/flop switch.
Dual COM Radios
If you have more than one COM radio that is capable of communicating with SkyView, only the
primary COM radio’s status information will be displayed in the Top Bar. Additionally, only the
primary radio will receive airports or frequencies from SkyView when SkyView’s TUNE or
APT>COM buttons are used.
However, if your second COM radio is a Dynon SV-COM-C25, all of its control-panel based
features work just like the primary radio’s. In other words, you can still use the APT button to
load airports, the TWR/GND/ATIS/ATC buttons to tune frequencies, and airport/station types
are reverse-looked up when you manually tune the second radio.