Question 7 Experimentation Description

0307-EX-CN-2017 Text Documents

Textron Aviation, Inc.

2017-04-26ELS_191068

April 26, 2017

Question 7: Purpose of Experiment

The purpose of the transmissions is to certify that VHF comm. radio communications will
not interfere with GPS navigation systems on board aircraft. The testing is required by the
FAA for experimental aircraft during certification, and also for each production aircraft.
All of the transmitters used are FCC certified.

The test frequencies were chosen because their 12th or 13th harmonics fall within +/- 1 MHz
of the GPS L1 frequency, M1575.42. The procedure requires that the GPS system acquire
satellites. The VHF radio is tuned to a test frequency and transmits for up to 20 seconds
while the GPS system is monitored to verify that no satellites are dropped, or other
indication of interference is observed. This procedure is repeated until all of the test
frequencies required for certification have been tested.

Dan Hankins
Spectrum Manager – Sr
Textron Aviation, Inc.

Document Created: 2017-04-26 09:13:54
Document Modified: 2017-04-26 09:13:54

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