Experimental Description

0100-EX-PL-2000 Text Documents

Aeronautical Radio, Inc.

2000-04-25ELS_35425

Aeronautical Radio, Inc. (ARINC), in cooperation with Rockwell/ Collins Aviation Group, is
establishing two ground stations on frequency 136.975 MHz, one each at the Collins
manufacturing facilities located in Melbourne, Florida, and Cedar Rapids, Iowa. The purpose of
these stations is to evaluate co-channel and adjacent channel protection requirements for the
recently ICAO “Standards and Recommended Practices” (SARPs) for VHF Data Link Mode-2
(VDL-2) air-ground data link communications.

These stations will operate under the control of a central computer located in the ARINC “System
Test-Bed” at ARINC Headquarters, Annapolis, MD, or in a “stand-alone” mode under the control
of a co-located computer for preliminary tests. All signals will be identifiable by digital addresses
contained in each data block sent by either the ground station, or the associated aircraft. Aircraft
will transmit only under the control of the associated ground station’s computer, and may be
operated at altitudes up to 45,000 ft MSL, for an effective range of approximately 225 nmi.

Experimentation at, or near line-of-sight is necessary to evaluate near/far effects among various
communications and navigation systems in the aircraft. The frequency 136.975 MHz is reserved
by ICAO specifically for VDL-2 as a “common signaling channel”, which has not yet been placed
in operational use. This application for an Experimental license is directly related to ARINC’s plan
for implementation of an operational system on this frequency.

Richard L. Neat
Manager,
ARINC Frequency Engineering

Document Created: 2001-07-30 14:22:32
Document Modified: 2001-07-30 14:22:32

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