ARINC Coordination

0201-EX-CM-2017 Pre Coordination Document

Textron Aviation, Inc.

2017-08-18ELS_197109

               GPS Interference Testing Frequencies and Parameters
                            ARINC / ASRI Coordination

Location: Beech Factory Airport (BEC), Wichita, Sedgwick County, KS, within 2 km
of coordinates 37-41-41 N Lat, 097-13-00 W Lon

Frequencies               Emissions                                Power
   • 131.2417 MHz         5K00A3E / 5K60A3E                        20 W mean
   • 131.250 MHz          5K00A3E / 5K60A3E / 6K00A3E              20 W mean
   • 131.2583 MHz         5K00A3E / 5K60A3E                        20 W mean
   • 131.2667 MHz         5K00A3E / 5K60A3E                        20 W mean
   • 131.275 MHz          5K00A3E / 5K60A3E / 6K00A3E              20 W mean
   • 131.2833 MHz         5K00A3E / 5K60A3E                        20 W mean
   • 131.2917 MHz         5K00A3E / 5K60A3E                        20 W mean
   • 131.300 MHz          5K00A3E / 5K60A3E / 6K00A3E              20 W mean
   • 131.3083 MHz         5K00A3E / 5K60A3E                        20 W mean

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 for certification of the 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 required for each of the test frequencies requested.



Document Created: 2017-08-11 11:54:17
Document Modified: 2017-08-11 11:54:17

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