Technical information
Table Of Contents
- TITLE PAGE
- TABLE OF CONTENTS
- INTRODUCTION
- SECTION I
- CHARACTERISTICS OF HF SSB
- ACRONYMS AND DEFINITIONS
- REFERENCES
- HF SSB COMMUNICATIONS
- FREQUENCY
- SKYWAVE PROPAGATION - WHICH FREQUENCY TO
- WHY SINGLE SIDEBAND IS IMPORTANT IN HF
- AMPLITUDE MODULATION (AM)
- SINGLE SIDEBAND OPERATION
- SINGLE SIDEBAND (SSB)
- SUPPRESSED CARRIER VS. REDUCED CARRIER
- SIMPLEX AND SEMI-DUPLEX OPERATION
- AUTOMATIC LINK ESTABLISHMENT (ALE)
- FUNCTIONS OF HF RADIO AUTOMATION
- HOW ALE ASSURES THAT THE BEST COMMUNICA-TIONS
- CHARACTERISTICS OF HF SSB
- SECTION II
- SECTION III
- SECTION IV
- SECTION V
- SECTION VI
- SECTION VII
- ITU MARITIME RADIOTELEPHONE STATIONS
- DESCRIPTION OF SERVICES
- AT&T HIGH SEAS RADIOTELEPHONE SERVICE
- AT & T COAST STATION COVERAGE MAP
- COAST STATION COVERAGE & INFORMATION
- AIRCRAFT REGISTRATION
- OPERATING PROCEDURES FOR USING THE HIGH SEAS RADIOTELEPHONE NETWORK
- AT&T HIGH SEAS COAST STATIONS
- MOBILE MARINE RADIO, INC.
- WORLDWIDE LISTING OF PUBLIC CORRESPONDENCE STATIONS
- MARITIME RADIOTELEPHONE CHANNEL DESIGNATIONS
- SECTION VIII
- SECTION IX
- SECTION X
- SECTION XI
- SECTION XII
- SECTION XIII
SECTION V
ICAO ENROUTE NETWORKS
ICAO ENROUTE NETWORKS DESCRIPTION OF
SERVICES
High frequency radio communications are used by aircraft to maintain
contact with Air Traffic Control during long over water flights or flights
in remote areas not covered by VHF communications.
HF frequencies are assigned to various areas of the world according
to agreements worked out between the International Civil Aviation
Organization (ICAO) and the International Telecommunications
Union (ITU) and national aviation authorities (such as the FAA in the
United States, and the CAA in the United Kingdom, etc.).
These agreements specify a certain family or network of HF frequen-
cies for each area. A network may consist of as many as seven or
more frequencies. When you first contact a ground station for ATC
communications, you will normally be assigned two or three HF fre-
quencies to use. Then, if you lose contact on the primary HF frequen-
cy due to deterioration of HF propagation, you can switch to your sec-
ondary or backup frequency and try to reestablish contact.
ARINC, a private not-for-profit company headquartered in Annapolis,
Maryland, has been licensed by the FCC to operate these networks
in most areas where the United States has been given responsibility
by the ICAO.
The ICAO High Frequency Enroute Network Chart which follows
shows the general outline of the networks and their associated fre-
quencies.
Services
5-1
KHF 950/990 Pilots Guide
Rev. 0
Dec/96