The Defence High Frequency Communications Service (DHFCS) provides long distance strategic communication between Army units, RAF aircraft, Royal Navy warships and UK headquarters using HF communications.
It has subsumed the following legacy systems:
Strike Command Integrated Communications System (STCICS), now known as Terrestrial Air Sea Communications (TASCOMM);
Maritime data services (broadcasts and ship/shore/ship communications);
NATO HF services provided by the RAF;
Defence Communications Service Agency (DCSA).
Base of operations
The system is based on six sites in the UK and four overseas.
In the UK they are Crimond, Inskip, Kinloss, Forest Moor, Penhale Sands and St Eval.
Overseas sites are Cyprus, Gibraltar, Ascension Island and the Falklands Islands.
The Network Control Station (NCS) is at Forest Moor (TASCOMM); it controls all DHFCS assets worldwide. The alternative network control centre (ANCS) is at Kinloss.
The system includes Automatic Link Establishment (ALE), Automatic Repeat Request (ARQ) and Automatic Link Management (ALM) and provides both voice and data services.
DHFCS was declared in service in March 2008 with the delivery of the ANCS at Kinloss.
There are H24 (flightwatch) operations centres at DHFCS Forest Moore and DHFCS Kinloss
(FOREST MOOR / KINLOSS)
|ALE CALLSIGN IS XSS|
|4742 - (H+15 weather broadcast when active)|
|VIPER||MT PLEASANT - FALKLAND ISLANDS||
NOTE: H+35 weather broadcasts when active.
1. Flight Watch available for notified flights.
2. Aircraft not fitted with ALE are to scroll through the frequencies in order to select the best reception. Transmissions are to be made at 15 sec intervals before changing to the next guard frequency.
Information source: US DoD FLIP
THE FOLLOWING ARE REFERENCED MATERIAL FROM A NOW DEFUNCT HF
NETWORK AND ARE NOT BE CURRENT
THESE FREQUENCIES ARE INCLUDED FOR REFERENTIAL PURPOSES ONLY
The previous HF network (pre-2006) was the STCICS. The following information applies to the STCICS and is shown as an archival reference only, although some frequencies do apply as discreets for DHFCS (although unconfirmed via our sources).
A) 4742, 5714, 6739, 9031, 11205, 18018 |
(GROUP B) 4540, 8190, 13257, 15031
(24Hr) 2591, 11247
Group A has QNH at H+00 and airfield colour-state at H+30.
Group B has RAF Germany airfield flying states at H+15 and H+45.
|Cyprus Flt Watch||Cyprus||4730,
9031 (1600-0500z), 11247, 18018 (0500-1600z)|
4730 and 18018 have weather at H+15.
|Gibraltar Flt Watch||Gibraltar||4742 (2000-0700z), 11247 (0700-2000z)|
(2000-0800z), 9031(0800-2000z), 11247|
All freqs have weather at H+45.
|Viper||Mount Pleasant, Falkland Is.||Any of the above.|
GROUND CONTROLLED INTERCEPTION
On HF the following air defence radar stations can be heard.
Buchan, Boulmer ,Neatishead, Benbecula
Frequencies in use are from the same pool as the STCICS above. On any day you can hear stations ask Architect for designator frequencies to work with the three above, mostly Neatishead.
GUIDE TO MONITORING STCICS
-To find which frequencies are active listen to the Architect weather broadcast at H+00 and H+30 (see above).
-If the UKADGE circuits are active there will be an announcement following weather with code letters for active freqs.
EG '...additional information 2..PK..tack..401C..tack..AG (repeated twice).
-The first number indicates which air defense radar is active.
1- Buchan, Boulmer, Benbecula
-The first 2-letter group is the code for the active HF frequency from the list (above), sometimes refered to as the Jorsk Frequency. This is the main operating frequency.
-The third group is the Charlie Squared channel, where AWACS aircraft pass their radar data.
Channel Frequency 401A 2250.5 401B 33? 401C 4478.5 401D 6673.5 401E 8500.5
-The final group is 'chick co-ordination' where HF capable combat aircraft can be passed target information, etc.
-Therefore the EG given would be Buchan as ADR, using 5095 KHz for voice traffic, AWACS on 4478.5 KHz and 'chicks' are on 4745 KHz.
RAF/NATO 'K Series'
A new set of codes seem to be being used by RAF and other NATO forces. The 'K series' (real name unknown).
Channel Frequency Channel Frequency Golf 02 3235 Kilo 26 UHF? Golf 08 4572 Kilo 27 UHF? Hotel 05 9010 Kilo 28 Beaver HF? Kilo 01 HF? Kilo 30 4477 Kilo 04 HF? Kilo 31 5045 Kilo 05 4520 Kilo 33 5385 Kilo 06 4020 Kilo 34 5463.5 Kilo 09 4920 Kilo 36 4012 Kilo 10 5173 Kilo 55 UHF? Kilo 11 5277.5 Kilo 56 UHF? Kilo 12 5290 KJ 02 3357 Kilo 14 UHF? KJ 04 3805 Kilo 15 7860 KJ 07 5280 Kilo 17 3304.5 KJ 11 ? Kilo 18 4860.5 KJ 28 UHF? Kilo 19 UHF? KJ 29 UHF? Kilo 22 4785 KJ 37 5910 (poss.) Kilo 24 4779 TL 04 6237 (poss.) Kilo 25 HF?
Royal Naval aircraft and ships often communicate about helicopters flying from land to ship or vice versa.
Freq Base 5.696 Culdrose Ops (Day) 3.921 Culdrose Ops (Night) 8.993 Portland ops 8.977 Yeovilton Ops (Primary) 6.685 Yeovilton Ops (Secondary) 6.706 Rescue Ops Center (Day) 3.093 Rescue Ops Center (Night) 6.730 FRADU "Grove Control" (P) 3.080 FRADU "Grove Control" (S) 9.013 Prestwick (Primary) 6.700 Prestwick (Secondary) 6.688 Yeovilton Ops
Updated 9 November, 2012.