Sagetech XPC-TR User Manual - Transponder Installation
8
XP Transponders User Guide Rev 1.3
Transponder Installation
Installation of Sagetech XP Transponders consists of:
Mounting the transponder in your airframe.
Routing power cables to the transponder (but not yet powering it up).
Co e ti g the t a spo de a le’s f ee e d te i atio s to ou control interface.
Connecting to a GPS data source if it is an ADS-B Out variant.
Installing an antenna.
Routing and connecting the antenna cable.
Connecting the altitude sensor/encoder to system Static Pressure.
Transponder Mounting
The mounting holes in the transponder accept 4-40 (or M3 x .05) machine screws. Most transponders
are 0.7 inches thick (18mm) at the mounting points; the XPG-TR with its GPS assembly is 1.0 inch thick
(25mm). The required minimum machine screw length depends on specific installation variables,
including the thickness of your mounting hardware, any washers, and the nut. When determining a
proper machine screw length, ensure excess machine screw length does not interfere with other
components.
The machine screws listed in Table 1 represent an approximate starting point in a search for the correct
screw for your custom installation.
Table 1
– Common Machine Screws
Quantity
Required
Description
Vendor
Vendor PN
4
1 1/4" Pan Head 4-40 Machine Screw
McMaster-Carr
90279A117
8
Washers
McMaster-Carr
98029A024
4
Lock Nuts
McMaster-Carr
90631A005
Sagetech recommends applying Loctite 242 Threadlocker to the machine screw threads, or using lock
washers or nuts.
Power
The transponder can be powered with 10-32 volts DC (at the transponder). Transponder power
consumption is documented Table 2. If you are supplying voltage to the transponder at the lower end of
that range, avoid voltage loss by using short power supply wires and/or larger diameter power supply
wires.