MGL Integrates Sandia Mode-C Transponder with EFISes

MGL Avionics announced the integration of the Sandia Aerospace STX 165R Remote Mode-C transponder with the following EFISes for Experimental and Light Sport Aircraft:
- MGL XTreme
- MGL Odyssey
- MGL Voyager
- MGL iEFIS Touchscreen

The STX 165R is a lightweight, low-cost, 200-watt, remote-mount Mode-C transponder. Through two data wires, the MGL EFISes are able to display transponder status, send encoded altitude to the STX 165R, control mode (OFF/STBY/ON/ALT), and adjust Squawk code and Ident.

MGL Avionics suggests this is a way of meeting the FAA transponder requirements in the U.S., where only Mode-C is required for recreational Part 91 flight. The ability to mount the transponder closer to its antenna and farther away from other avionics in the aircraft is an advantage for homebuilders trying to lay out a clean and interference-free panel.

The STX 165R retails for $1,550. It weighs 1.16 pounds and uses 200 mA of power. It measures 3.5x1.8x6.9 inches.

For more information on the XTreme EFIS, visit, or call 877/835-9464.

For more information on the Sandia STX 165R Transponder, visit, or call 505/341-2930.

Sandia Introduces Transponder

Sandia Aerospace announced a new Mode C transponder with built-in encoder. The lightweight STX 165 has a one-half 3ATI front bezel and measures 7 inches depth behind the panel. The small size allows the STX 165 to be mounted outside of the center stack, making that space available for other avionics. In addition to displaying the transponder code, the unit also displays pressure altitude, has three timer functions, and with the addition of an outside air temperature probe, outside air temps, density altitude and even icing alerts.

The introductory price is $1700.

For more information, go to the Avionics Place at AirVenture, Hangar C, Booth 3007 or visit