Sagetech XPC-TR, Руководство пользователя

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11 XP Transponders User Guide Rev 1.3
Use an antenna designed to be used with aviation transponders with the characteristics documented in
Table 3.
Table 3
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Transponder Antenna Requirements
Antenna Requirements
Frequency 1030 to 1090 MHz
Polarization Vertical
Nominal Impedance
Ω
VSWR <1.5 between 1030 to 1090 MHz
Radiation Pattern The gain must not be less than the gain of a matched quarter-
wave stub minus 3 dB over 90 percent of a coverage volume
from 0 to 360 degrees in azimuth and from 5 to 30 degrees
above the ground plane when installed at the center of 1.2 m
(4 foot) diameter (or larger) flat circular ground plane.
Mounting Location Underside of aircraft fuselage, nominally at the wing root
Note : If your installation does not meet all of the above requirements, transponder
performance (range) may be hindered and damage to the transponder could result.
Important:
Whenever power is supplied to the transponder, a 50 ohm load should be provided
to the SMA connection. Ensure that the antenna selected provides a 50 ohm
termination for the transponder.
Table 4
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Examples of Transponder Antennas
Thumbnail Type Vendor Vendor PN Weight Connector
Monopole Antenna Aircraft Spruce and Specialty 11-17995 30 g BNC Female
Blade Antenna Aircraft Spruce and Specialty AV-74 100 g BNC Female