SkyView - Dynon Avionics

Serial GPS Position Input (Future Use – Do Not Connect)SV-XPNDR-26X Installation, Configuration, and TestingADS-B OUT transmissions that meet the 2020 FAA ADS-B equipment mandate require that aTSO 146c GPS signal be directly provided from the GPS to a capable ADS-B device (such as theSV-XPNDR-26X). For this purpose, a dedicated serial input is provided on the SV-XPNDR-26Xmodule that allows an appropriate GPS receiver serial output to be connected directly to theSV-XPNDR-26X. At the time of writing, the SV-XPNDR-26X is certified to TSO C166a. The FAAhas recently mandated TSO C166b for NextGen implementations, and a TSO-C166b softwareupgrade for the transponder is planned. This means that currently, the SV-XPNDR-26X’s ADS-Btransmissions are not at a high enough integrity level to meet the FAA’s 2020 ADS-B equipmentmandate. Therefore, do not connect any GPS device to this serial port. It will be utilized in thefuture upon the availability of SV-XPNDR-26X software that meets TSO-C166b and certified GPSoutput that meets the requirements of the FAA’s 2020 ADS-B mandate.Antenna InstallationThe antenna should be installed according to the manufacturer’s instructions.The following considerations should be taken into account when siting the antenna:The antenna should be well removed from any projections, the engine(s) andpropeller(s). It should also be well removed from landing gear doors, access doors orothers openings which will break the ground plane for the antenna.The antenna should be mounted on the bottom surface of the aircraft and in a verticalposition when the aircraft is in level flight.Avoid mounting the antenna within 3 feet of the ADF sense antenna or any COMMantenna and 6 feet from the transponder to the DME antenna.Where practical, plan the antenna location to keep the cable lengths as short as possibleand avoid sharp bends in the cable to minimize the VSWR.Electrical connection to the antenna should be protected to avoid loss of efficiency as a resultof the presence of liquids or moisture. All antenna feeders shall be installed in such a way that aminimum of RF energy is radiated inside the aircraft.Antenna Ground PlaneWhen a conventional aircraft monopole antenna is used it relies on a ground plane for correctbehaviour. For ideal performance the ground plane should be very large compared to thewavelength of the transmission, which is 275 mm. In a metal skinned aircraft this is usually easyto accomplish, but is more difficult in a composite or fabric skinned aircraft. In these cases ametallic ground plane should be fabricated and fitted under the antenna.As the ground plane is made smaller, the actual dimensions of the ground plane become morecritical, and small multiples of the wavelength should be avoided, as should circles. Rectanglesor squares are much less likely to create a critical dimension that resonates with thetransmissions. The smallest practical ground plane is a square around 120 mm per side; as theSkyView System Installation Guide - Revision J 11-9