HFGCS Scope Command HF ALE Network 
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HFGCS ALE Network frequencies USB/ALE (scan channel number):
3137.0 (1) 4721.0 (2) 5708.0 (3) 6721.0 (4) 9025.0 (5) 11226.0 (6) 13215.0 (7) 15043.0 (8) 18003.0 (9) 23337.0 (10) kHz

The ALE system used by the JCS HFGCS network is designated MIL-STD-188-141A. You can download a software program developed by Dr. Charles Brain to decode these digital transmissions at http://hflink.com/beta/. You can also use F6CTE's Multipsk program at http://f6cte.free.fr/index_anglais.htm. It is my favorite multimode program and always gets a work out in the Btown Monitoring Post.

ALE allows automated ground agency contact by selecting the best station and best frequency without operator interaction. ALE radios make this possible by using a datafill that contains frequency, station and other pertinent information. For ALE radios to operate properly, the radio must have a loaded datafill, be turned on in the “automatic” mode and remain there the duration of the flight. If the radio is removed from the ALE mode, history tables will require time to rebuild and initial communications may be slightly degraded.

Net participating stations, identifiers and specific frequency assignments used in the HFGCS ALE net:

ADW Andrews AFB, MD USA 3137 4721 5708 6721 9025 11226 13215 15043 18003 23337

AED Elmendorf AFB, AK USA 3137 4721 5708 6721 9025 11226 13215 15043 18003 23337

CRO RAF Croughton, UK 3137 4721 6721 9025 11226 13215 15043 18003 23337

GUA Andersen AFB, Guam 3137 4721 5708 6721 9025 11226 13215 15043 18003 23337

HAW Ascension Island 3137 4721 6721 9025 11226 13215 15043 18003 23337

HIK Hickam AFB, Hawaii 3137 4721 6721 9025 11226 13215 15043 18003 23337

ICZ Sigonella, Sicily Italy 3137 4721 5708 6721 9025 11226 13215 15043 18003

JDG NSF Diego Garcia 3137 4721 5708 6721 9025 11226 13215 15043 18003 23337

JNR Salinas, Puerto Rico 3137 4721 5708 6721 9025 11226 13215 15043 18003 23337

JTY Yokota AB, Japan 3137 4721 6721 9025 11226 13215 15043 18003

MCC West Coast (McClellan), CA USA 3137 4721 5708 6721 9025 11226 13215 15043 18003 23337

MPA Mt. Pleasant, Falkland Island 3137 4721 5708 6721 9025 11226 13215 15043 18003 23337

OFF Offutt AFB, NE USA 3137 4721 5708 6721 9025 11226 13215 15043 18003 23337

PLA Lajes AB, Azores 3137 4721 5708 6721 9025 11226 13215 15043 18003 23337

Selected non HF-GCS stations observed in this net:
CEF 439AW, Westover AFB, MA
GBL Unknown
GVT Raytheon, Greenville, TX
IKF NAS Keflavik, Iceland (HF-GCS facility closed)
OKC Oklahpma City (Tinker AFB), OK
RIC CAP Region 2 MER/CAP National Technology Center, Richmond, VA
RSC Rockwell Scope Command Facility, Greenville, TX
TAG Incirlik AB, Turkey (HF-GCS Facility Closed)
WRL Warner-Robins AFB, GA