Difference between revisions of "USAF High Frequency Global Communications System"
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West Coas 0130-1400Z 0030-1500Z 24 hours 24 hours 1400-0130Z 1500-0030Z | West Coas 0130-1400Z 0030-1500Z 24 hours 24 hours 1400-0130Z 1500-0030Z | ||
Yokota 0900-2100Z 0800-2200Z 24 hours 24 hours 2100-0900Z 2200-0800Z | Yokota 0900-2100Z 0800-2200Z 24 hours 24 hours 2100-0900Z 2200-0800Z | ||
+ | |||
+ | Unclassified Phone Patch and Message Relay Services | ||
+ | |||
+ | (a) Phone Patch Service. Phone patching allows direct voice communications | ||
+ | between ground agencies and aircraft by electronically connecting telephone circuits to radio | ||
+ | transmitters and receivers. Phone patch service is reserved for official unclassified business only | ||
+ | and shouldn’t exceed 5 minutes. Patches of more than 5 minutes or of a sensitive nature should be | ||
+ | run on a discrete frequency. Users requesting a phone patch must include all information necessary | ||
+ | for HFGCS operators to complete the call, such as the identity or location of the called parties and | ||
+ | telephone number if known. Phone patches are monitored by HFGCS operators. If radio reception | ||
+ | isn’t of sufficient quality to complete the patch, they will attempt to copy the traffic and relay it to | ||
+ | addressees. | ||
+ | |||
+ | (b) Message Relay Service. HFGCS operators transcribe encoded or plain-text | ||
+ | messages for aircraft or ground stations and forward them to the addresses by radio or landline. | ||
+ | The text of the messages can be in the form of alpha-numerics, code words, plain text, acronyms, | ||
+ | and/or numerical sequences. Aircrews may use "READ BACK" procedures when the message data | ||
+ | is critical, or when an incomplete transmission is suspected due to poor radio reception. All | ||
+ | messages received by Global stations will be accepted and delivered by the fastest means available | ||
+ | according to precedence and priority. | ||
+ | |||
+ | (c) [[ALE]] - For ALE radios to operate properly, the radio must have a loaded datafill, | ||
+ |
Revision as of 14:14, 1 May 2005
USAF HIGH FREQUENCY GLOBAL COMMUNICATIONS SYSTEM (HFGCS)
GENERAL - The HFGCS System is a worldwide network of 15 high-power HF stations providing air/ground HF command and control radio communications between ground agencies and US military aircraft and ships. Allied military and other aircraft are also provided support IAW agreements and international protocols as appropriate. The HFGCS is not dedicated to any service or command, but supports all DoD authorized users on a traffic precedence/priority basis. General services provided by the HFGCS are:
- General Phone Patch and Message Relay Services
- Automatic Link Establishment (ALE)
- HF Data Support
- Command and Control Mission Following
- Emergency Assistance
- Broadcasts
- HF Direction Finding Assistance
- ATC Support
- E-Mail connectivity to NIPRNeT and SIPRNeT
MODERNIZATION - SCOPE Command replaces older high power Global HF equipment. SCOPE Command incorporates Automatic Link Establishment (ALE) to automate communications. All HFGCS station transmit and receive equipment is remotely controlled from the Centralized Network Control Station (CNCS) at Andrews AFB, MD.
General Calling. Aircrews use a preliminary call as outlined in ACP-121 US Supp 2 using the collective callsign "MAINSAIL" or the HFGCS station call sign (example: Sigonella Global this is Dark 86 on 11175, OVER). HFGCS operators require approximately 10 seconds (for automated equipment configuration) to respond to calls for service. The HFGCS operator may request the aircraft change to a discrete frequency for improved and/or extended service.
(a) PUBLISHED FREQUENCY LISTING - frequencies to provide increased "Global" coverage. The published frequency listing does not reflect complete system frequency authorizations. These published frequencies will be used for initial contact, EAM broadcasts, and short-term C2 phone patch and message delivery. Other extended or special services will be moved to each station’s available "discrete" frequencies.
(b) FREQUENCY GUIDE - The frequency guides are designed to optimize air/ ground communications.
Primary HFGCS Frequencies 24 Hours: 8992 and 11175 Back up HFGCS Frequencies Day: 13200 15016 Back up HFGCS Frequencies Night: 4724 6739
DISTANCE (1) TIME (2) 200-7500 NM 750-1500 NM More than 1500 NM ------------------------------------------------------------------- 0000L 4724 6712-6739-8992 6712-6739-8992-11175 0400 L 4724 4724-6712-6739 6712-6739-8992 0800 L 4724-6712-6739 6712-6739-8992-11175 11175-13200-15016 1200 L 4724-6712-6739 8992-11175-13200 13200-15016 1600 L 4724-6712-6739 8992-11175-13200 13200-15016 2000 L 4724-6712-6739 6712-6739-8992-11175 1175-13200-15016 1. When less than 200 NM any frequency 2. Local time at ground station.
FREQUENCIES - SUMMER (Apr-Sep) STATION 4724 6712 6739 8992 11175 13200 15016 ---------------------------------------------------------------------------------------- Andrews 0500-1330Z 0300-1600Z 24 hours 24 hours 1330-0500Z 1600-0300Z Ascension 2300-0700Z 2200-0900Z 24 hours 24 hours 0700-2300Z 0900-2200Z Croughton 2300-0600Z 2100-0800Z 24 hours 24 hours 0600-2300Z 0800-2100Z Dieg Gar 1400-0100Z 1200-0200Z 24 hours 24 hours 0100-1400Z 0200-1200Z Elmendorf 0600-1500Z 0400-1700Z 24 hours 24 hours 1500-0600Z 1700-0400Z Guam 1300-2200Z 1100-2400Z 24 hours 24 hours 2200-1300Z 2400-1100Z Hawaii 0800-1700Z 0700-1800Z 24 hours 24 hours 1700-0800Z 1800-0700Z Keflavik 1930-0600Z 1630-1000Z 24 hours 24 hours 0600-1930Z 1000-1630Z Lajes 2200-0800Z 2000-1200Z 24 hours 24 hours 0800-2200Z 1200-2000Z Offutt 0400-1330Z 0200-1700Z 24 hours 24 hours 1330-0400Z 1700-0200Z Puerto R 0400-1200Z 0100-1400Z 24 hours 24 hours 1200-0400Z 1400-0100Z Sigonella 2200-0530Z 1900-0900Z 24 hours 24 hours 0530-2200Z 0900-1900Z West Coas 0600-1400Z 0300-1800Z 24 hours 24 hours 1400-0600Z 1800-0300Z Yokota 1300-2200Z 1100-2200Z 24 hours 24 hours 2200-1300Z 2200-1100Z
FREQUENCIES - WINTER (Oct-Mar) STATION 4724 6712 6739 8992 11175 13200 15016 ---------------------------------------------------------------------------------------- Andrews 2400-1200Z 2200-1400Z 24 hours 24 hours 1200-2400Z 1400-2200Z Ascension 2200-0800Z 2100-1000Z 24 hours 24 hours 0800-2200Z 1000-2100Z Croughton 1800-0600Z 1700-0900Z 24 hours 24 hours 0600-1800Z 0900-1700Z Diego Gar 1600-2300Z 1400-0200Z 24 hours 24 hours 2300-1600Z 0200-1400Z Elmendorf 0330-1630Z 0200-1800Z 24 hours 24 hours 1630-0330Z 1800-0200Z Guam 1300-2030Z 0800-2200Z 24 hours 24 hours 2030-1300Z 2200-0800Z Hawaii 0700-1600Z 0400-1800Z 24 hours 24 hours 1600-0700Z 1800-0400Z Keflavik 1700-0730Z 1530-1000Z 24 hours 24 hours 0730-1700Z 1000-1530Z Lajes 1800-0730Z 1700-0900Z 24 hours 24 hours 0730-1800Z 0900-1700Z Offutt 0030-1330Z 2300-1400Z 24 hours 24 hours 1330-0030Z 1400-2300Z Puerto R 0100-1100Z 2300-1200Z 24 hours 24 hours 1100-0100Z 1200-2300Z Sigonella 1700-0500Z 1600-0800Z 24 hours 24 hours 0500-1700Z 0800-1600Z West Coas 0130-1400Z 0030-1500Z 24 hours 24 hours 1400-0130Z 1500-0030Z Yokota 0900-2100Z 0800-2200Z 24 hours 24 hours 2100-0900Z 2200-0800Z
Unclassified Phone Patch and Message Relay Services
(a) Phone Patch Service. Phone patching allows direct voice communications between ground agencies and aircraft by electronically connecting telephone circuits to radio transmitters and receivers. Phone patch service is reserved for official unclassified business only and shouldn’t exceed 5 minutes. Patches of more than 5 minutes or of a sensitive nature should be run on a discrete frequency. Users requesting a phone patch must include all information necessary for HFGCS operators to complete the call, such as the identity or location of the called parties and telephone number if known. Phone patches are monitored by HFGCS operators. If radio reception isn’t of sufficient quality to complete the patch, they will attempt to copy the traffic and relay it to addressees.
(b) Message Relay Service. HFGCS operators transcribe encoded or plain-text messages for aircraft or ground stations and forward them to the addresses by radio or landline. The text of the messages can be in the form of alpha-numerics, code words, plain text, acronyms, and/or numerical sequences. Aircrews may use "READ BACK" procedures when the message data is critical, or when an incomplete transmission is suspected due to poor radio reception. All messages received by Global stations will be accepted and delivered by the fastest means available according to precedence and priority.
(c) ALE - For ALE radios to operate properly, the radio must have a loaded datafill,