VAL Avionics NAV 2000 User's Guide download pdf (Page 84)

Transponder Operation

6-4 SkyView Pilot’s User Guide - Revision Q

VFR

Press to quickly tune the VFR squawk code. This is usually 1200 in the US and 7000 in Europe.

Refer to the Installation Guide to set the VFR code that this button tunes. Once pressed, the

VFR button will remain highlighted until the transponder code is changed to show that you are

in VFR mode. Press the button while VFR is highlighted to return the transponder to the last

code tuned.

IDENT

Press to ident when requested to “ident” by ATC. “IDT” will be displayed in the Transponder

Status Area for the next 18 seconds as the transponder sends the ident signal. Note that if a

button is pressed to change the transponder mode or to turn it off, that action will be delayed

until the ident transmission completes.

Reported Pressure Altitude

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-26X, setting BARO to 29.92 will display the

pressure altitude being transmitted to the transponder in the normal SkyView altitude display

on the PFD page.

ADS-B OUT Transmissions

If SkyView has a valid GPS signal and a SV-XPNDR-26X module is installed and working, it

automatically provides ADS-B output at the appropriate integrity level for the GPS signal being

used.

ADS-B OUT transmissions that meet the 2020 FAA ADS-B equipment mandate require that a

TSO 146c GPS signal be directly provided from the GPS to a capable ADS-B device (such as the

SV-XPNDR-26X). For this purpose, a dedicated serial input is provided on the SV-XPNDR-26X

module that allows an appropriate GPS receiver serial output to be connected directly to the

SV-XPNDR-26X. As of this software version, the SV-XPNDR-26X is certified to TSO C166a. The

FAA has recently mandated TSO C166b for NextGen implementations, and a TSO-C166b

software upgrade for the transponder is planned. The current SV-XPNDR-26X is compatible

with Aviation format GPS outputs, used by Bendix/King, Garmin and others, as well as some

high-end GPS modules not likely to be used in a homebuilt or LSA aircraft. The popular Aviation

format output will not meet all the integrity requirements of the FAA NextGen system, and

therefore our TSO C166b software will include additional GPS interfaces as they become

available. This means that currently, the SV-XPNDR-26X’s ADS-B transmissions are not at a high

enough integrity level to meet the FAA’s 2020 ADS-B equipment mandate.

If you are operating within the United States, there may be a service bulletin which

applies to your transponder, please see the Service Bulletins section of our website

for more information.

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VAL Avionics NAV 2000 User's Guide Page 84