Originally Posted by
Dickey
Hi Jon,
The World Panel is equipped with the Trig TT21 or optional TT22 transponder. These transponders are able produce the extended squitter signal that is ADS-B but there are a couple of issues you need to be aware of.
1. In the U.S., the transponder that is producing the ADS-B signal must be producing no less than 125 watts at the antenna. The TT21 output rating is 125 nominal (meaning that once installed in the aircraft, the wiring and installation could cause the output to diminish slightly. If you have a TT22 you're in good shape because its nominal output is 250 watts.
2. The transponder must be getting its GPS position from a compliant position source and handheld/portable devices do not meet this requirement. Trig offers the TN70 which is a remotely mounted (no user interface) GPS that feeds the transponder with compliant position data. It comes with a WAAS antenna.
3. To be compliant, the ADS-B signal is required to report "Ground Status" when on the ground and "Airborne Status" when in the air. No more switching to stand-by when on the ground. This "switching" can not be done by the pilot, it has to be automatic (the "A" in ADS-B stands for automatic). The Trig transponders can only do this automatic switching via a weight on wheels switch or an airspeed switch. Since a "squat" switch is not possible on the Carbon Cub, the airspeed switch is the only option. Be advised.........the point at which the airspeed trips the switch must be just below the stall speed of the aircraft to prevent erroneous status messages when in slow flight or final approach.
Are you looking to upgrade your existing World Panel or looking for advise on a new aircraft?
-Matt Dickey-
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