Installation guide

SV-XPNDR-261/262 Installation, Configuration, and Testing
11-18 SkyView System Installation Guide - Revision R
o SKYVIEW: SkyView reports its GPS position to the transponder via its nominal
SkyView<>SV-XPNDR-261/262 serial connection. Using this setting causes the
transponder to transmit the following ADS-B performance parameters:
 SIL: 0 (Unknown integrity)
NACp: 8, 9 or 10. Dynamic, as reported by GPS.
NIC: 8 (Containment radius <0.1 NM)
NACv: 1 (10m/s accuracy)
 GPS STATUS: Displays whether the SV-XPNDR-261/262 is receiving valid GPS data.
 ADS-B IN FREQUENCY: Tells the ADS-B system which frequency (US-only) the aircraft can
receive traffic/weather information on.
If an SV-ADSB-470 is installed and configured under SETUP MENU > SYSTEM SETUP
> SERIAL PORT SETUP, this option will be unavailable: The SV-ADSB-470
automatically receives ADS-B In traffic and weather via the UAT frequency band.
Note that the options in the ADS-B IN FREQUENCY only have an effect with
transponder software 2.02 or above. See the Transponder Software Updates
section below for more information about transponder software.
o NONE: The aircraft does not have ADS-B In capability
o 978 MHz UAT: The aircraft can receive ADS-B traffic and/or weather information via
a non-Dynon UAT band (978 MHz) device.
o 1090 MHz ES: The aircraft can receive ADS-B traffic information via a 1090 MHz ES
(extended squitter) device.
Altitude Encoder Calibration
In most transponder systems, a calibration is normally carried out every 24 months, as part of
the altimeter checks on the aircraft. The maximum allowed difference between the primary
altimeter and the altitude encoder is 125 feet in ETSO C88a and TSO C88b. The primary
altimeter in SkyView and the altitude encoder are one and the same device. It is therefore
impossible for the encoder and the primary altimeter to exceed 125 feet of altitude difference.
They will always be exactly the same as each other, thereby meeting the TSO requirements.
Therefore, no altitude encoder calibration is possible or necessary.
At times it may be useful to know the altitude that is being reported to the transponder. Since
SkyView sends pressure altitude to the SV-XPNDR-261/262, setting BARO to 29.92 will display
the pressure altitude being transmitted to the transponder in the normal SkyView altitude
display on the right side of the PFD page.
However, note that there is a single point altitude adjustment, located in SETUP MENU >
HARDWARE CALIBRATION > ADAHRS CALIBRATION > ALTITUDE ADJUST that adjusts SkyView’s
barometric altimeter. This adjustment affects both the displayed altitude and the encoded
altitude that is sent to other devices.