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Av. Kit Install. Manual
190-00067-02 Rev. J
Page 8
Sequence Hold Low: Input, when grounded, activates HOLD mode. See
(Pin 13) the GNC 300 Pilot's Guide (GPN 190-00067-00) for
more information.
1.2.3.3 COMM Antenna Connector (J4)
Capable of providing 5 watts, minimum, at 13.8V. Sensitivity of 6 dB SNR, minimum,
at 2 uV hard. The COMM antenna shall be approved to TSO C37( ) and C38( ).
1.3 LICENCE REQUIREMENTS
The transmitter, as installed in the aircraft, requires an Aircraft Radio Station
Licence. This licence is obtained by filing the FCC Form 404. While awaiting the
receipt of the station licence, a copy of FCC Form 404 is kept in the aircraft.
This equipment has been type accepted by the FCC and entered on the type ac-
cepted equipment list, as GARMIN GNC 300 and must be identified as GARMIN
GNC 300 on your Form 404, Aircraft Radio Station Licence application.
CAUTION
THE VHF TRANSMITTER IN THIS EQUIPMENT IS GUARANTEED TO MEET
FEDERAL COMMUNICATIONS COMMISSION ACCEPTANCE OVER THE OPER-
ATING TEMPERATURE RANGE. MODIFICATIONS NOT EXPRESSLY APPROVED
BY GARMIN COULD VOID THE LICENCES' AUTHORITY TO OPERATE THE
EQUIPMENT.
SECTION 2 INSTALLATION CONSIDERATIONS
Careful planning and consideration of the suggestions in this section are required to
achieve the desired performance and reliability from the GNC 300.
2.1 ANTENNA CONSIDERATIONS
2.1.1 GPS ANTENNA LOCATION
The GNC 300 GA 56 Antenna must be mounted on top of the aircraft. For best
performance select a location with an unobstructed view of the sky above the aircraft
when in level flight. Figure 2-1 illustrates a typical GPS antenna installation.
For rotorcraft, locate the GA 56 antenna:
1) As far from the main rotor hub as possible. This reduces the percentage of time
the blade blocks the antenna.
2) As far below the blade surface as possible if installing the antenna under the blade.
This reduces signal distortion caused by the blades.