Narco AT-150 Transponder
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2.4 Antenna Installation
2.4.1 Antenna Location And Mounting
The AT 150 Antenna supplied in the Installation Kit should be mounted on the bottom surface of the aircraft and located such that it will be in a vertical position when the aircraft is in level flight. The area surrounding the antenna location should be free of protrusions which could interfere with the line-of-sight characteristics of a VHF signal. The following rules should be observed with regard to the ground plane.
A doubler plate will be needed for an airworthy installation on most aircraft. Check the airworthiness regulations of the country of aircraft registry for acceptable mounting methods.
Figure 2-3 illustrates the antenna mounted and the necessary minimum clearances. Remove all oxidation, paint, or other finish to permit good electrical contact between the antenna base and the aircraft. Electrical ground will be carried by the mounting hardware. Do not paint. The antenna should not be painted or coated with any other finish.
Figure 2-3 - AT 150 Antenna Mounting
2.4.2 Antenna Extension Cable
The Installation Kit provides two UG-88U BNC connectors for fabrication of the antenna extension cable. The total length of this cable should not exceed 9 feet (2.7m). Should a cable of greater length be required, a coaxial cable type should be selected whose attenuation does not exceed 2 dB over the entire length.
Narco makes available eight and nine foot low loss extension cables, complete with factory-installed BNC connectors; order Part Number 90624-0096 (8 foot) or Part Number 90624-0108 (9 foot).
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