Hf data link. Tactical Data Links. Published by ARINC on December 22, 2003. Aug 1, 2016 · This paper presents the comparison of the BER performance between SC-FDE, OFDMA and SC-FDMA in a long haul HF data link with low SNR. The HFDLP [2, 7] is a selective repeat ARQ protocol with the ability to adaptively vary several parameters in response to changing channel conditions. At first it relied exclusively on VHF channels but more recently, alternative means of data transmission have been added which have greatly enhanced its geographical coverage. Of course, the on-board equipment belongs to the airline, which may also own the ground subnetwork or may lease the services from a CSP. This fact puts down the effectiveness of most of channel coding schemes because they are usually optimized to work over data blocks with uniform Data link. We’re getting close. 1 The HFDL system enables aircraft based computers to exchange data with ground-based computers via the high frequency radio frequency spectrum. HF DATA LINK SYSTEM. Rockwell Collins recently showed just how far for wideband, high-data-rate communications, with an HF link of 5,000 miles that successfully transferred data files as large as 1 MB. Current FCC Rules in USA allow DATA modes on HF up to 300 baud (300 symbols per second). HFDLP. A data link is a means of connecting one location to another for the purpose of transmitting and receiving digital information ( data communication ). The characteristics of a High Frequency Data Link (HFDL) communications system are defined by this standard. Aug 1, 1999 · "SARPS for HF Datalink, AMCP/5 -WP 172, January 1998, Rio de Janeiro, Brazil (2) "lnteroperability and performance standars for data modems", MIL-STD-188-11 OA, Sept. Next, an overview of HDL+ is presented. Aug 30, 1996 · This Report provides the reader with material to enhance the understanding of high frequency data link. The "profile" describes a set of functions together with the interfaces, data formats, and procedures required for interoperable data communications over HF radio links using commercial-off-the-shelf (COTS) HF modems. This new station joins 15 other HFDL ground stations located around the world. February 20, 1998. It uses HF to transfer data. AMCP/4-WP/70 6A-8 Appendix to the Report on Agenda Item 6 3. However, it is certainly possible to support duplex flow of client data over a single logical link by including both client data and ARQ Abstract: In this work we deal with the design and simulation of a complete multi-carrier modem alternative to the recommended one (single-carrier) for the high frequency data link standard (known as HFDL) for communications between ground stations and civil aircraft. Feb 16, 2001 · 753-2. Techn. The station at Telde, Gran Canaria, was deployed with the cooperation and support of Spain's civil aviation authority AENA (Aeropuertos Españoles y Civil aviation approved 400 W HF transceiver Antenna tuning unit ¸FK516 Approved for HF data link in line with ARINC R&S®XK2000 HF radio family Second generation of HF data communications with ALIS and automatic link establishment (ALE) in line with MIL STDs Data rate of up to 5. ARINC635-4. The protocols have the characteristics of code combining and synchronous transmission times, which allow them to optimally adapt to HF channel conditions and to minimize protocol misalignment. SHANGHAI (April 12, 2019) – Collins Aerospace Systems has implemented its first High Frequency Data Link (HFDL) Ground Station in Korea’s South Jeolla Province, which will enhance the company’s air-to-ground communication services in the North-Pacific region. chbrain. Perlman, S. 2 CONTROL FUNCTIONS. PC-HFDL Software: http://www. >Embedded industry-standard HFDL functionality Dec 22, 2003 · HF DATA LINK PROTOCOLS. The intent of this document is to provide general and specific design guidance for the development and installation of the protocols needed to exchange bit-oriented data using an air-ground HF data link operating in an Open System Interconnection (OSI) environment. The Jun 16, 2022 · Improvements in HF technology such as STANAG 4539 (for high-speed data transmission), automatic link establishment (ALE), wideband HP, and multi-node HF networks, has led to NATO introducing updated requirements. Controller–pilot data link communication (CPDLC) is a means of communication between controller and pilot, using data link for ATC communication. HFDL (high frequency data link) is the generic term for a system in use by long haul airlines for aircraft tracking and text messaging. A transmis-sion usually consists of a data series, containing several data frames, or a single control frame. The purpose of this manual is to provide the reader with guidance material on the implementation and use of the high-frequency data link (HFDL). Radio frequency travels through air at the same speed of […] A tactical data link ( TDL) uses a data link standard in order to provide communication via radio waves or cable used by NATO nations. Four separate sub-systems comprise the HFDL system: a HF-9500 NEXT-GEN: PHASED PATHWAY TO MODERNIZED CAPABILITIES • Modern I/O interfaces: Ethernet, USB • 3G HF waveform (3G ALE and data modes) • Type-3 AES-256 encryption • MELPe digital voice vocoder • Embedded ARINC 635 High Frequency Data Link (HFDL) • Wideband HF data and wideband (4G) ALE PROVISIONED FOR ADVANCED AND SPECIALIZED cryptographic device, the Link-11 data terminal set,The central processor of the Combat Direction the communications switchboard, and the HF or UHFSystem is the CDS computer. MIL-STD-188-110 Interoperability and Performance Standards for HF Data Modems MIL-STD-188-114 Electrical Characteristics of Digital Interface Circuits MIL-STD-188-148 (S) Interoperability Standard for Anti-Jam (AJ) Communications in the High Frequency Band (2-30 MHz) (U) Oct 13, 2003 · The data link protocols developed by Harris Corporation and discussed in this paper, HDL+, apply the code combining concepts to the higher capacity data waveforms of S4539. But we note that any HF capable SDR can be used to wireless ARQ protocols also permit client data to flow in only one direction on the data link, with the return channel carrying only acknowledgements. 27× larger data rates, 9× less transmit power, and > 3× fewer link failures were observed in 2 × 2 MIMO HF NVIS channels with crosspolarized Spectrogram of the HF channel This kind of channels recommends the use of data interleaving in the transmission link, since data errors do not appear isolated but distributed in relative long bursts. This document provides the reader with guidance material to be considered in several areas within the HFDL system, including the airborne avionics HF-9500 SYSTEM CAPABILITIES • Single sideband (SSB) • Independent sideband data (ISB) • Amplitude Modulation Equivalent (AME) • Continuous wave (CW) • 2G Automatic Link Establishment (ALE) • ARINC 714 selective calling (SELCAL) • Low-rate data modes: 75 bps to 19. 1991 Recommended publications Here we take a look at how to Decode HFDL signals using PC-HFDL software with Software Defined Radio. Together with an ACARS Management Unit or Communications Management Unit (CMU), the SP2310 HFDL provides the capability to exchange data with other aircraft or ground station supporting AOC, ATS and ATC MIL-STD-6011 exchanges digital information among airborne, land-based, and shipboard tactical data systems. Wireless beats fiber The quest for faster networks is aiming for the ultimate speed of light. HFDL fulfills several key roles: 1) provides aircraft that are not SATCOM-equipped with a long-range, cost-effective data link; 2) serves as a data link for polar regions where SATCOM performance degrades and 3) acts in combination with SATCOM as very high performance system capable of meeting future ATN availability requirements. It also contains a file that can be used in the registered version of PC-HFDL. BRE1TA, followed by the anticipated BRE2TA, intend to keep the BRASS programme moving forward in tandem with HF technology advancements. The RM2 is designed to operate in conjunction with an external STANAG 5066 ARQ server such as the RC50 Email Communications Suite. Mar 16, 2024 · HFDL, also known as HF High Frequency (3-30 MHz)-ACARS, ARINC 753, ARINC 635, and HF High Frequency (3-30 MHz) DATALINK,is a data link that aircraft use to communicate short messages over long distances using HF High Frequency (3-30 MHz) signals. Staff June 01, 1998. Collapse Revisions Panel. The 101. However, the U. As with VHF ACARS, there are several programs available that will decode it. 2 HF data link sub-systems 3. All military C3 systems use standardized TDL to transmit, relay and receive tactical data. Frequencies immediately below HF are denoted medium May 1, 2015 · The goal of the project is to send geomagnetic data from the sensors in the SAS to Cambrils using a ionospheric long haul link of 12 700 km. HFLINK is an international information exchange for ALE Automatic Link Establishment and HF Selective Calling, since 2001. Details on link layer functions are contained in the appendix to these SARPs . ARINC 634 and ARINC 753 are companion standards. Global ALE High Frequency Network HFN - Amateur Radio - Ham Radio - Emergency Disaster Relief Communications - HF Interoperability - ALE Information Manual on HF data link. to complement Link 16; and; to enhance the commanders' war fighting capability. However, the rate at which user data is transmitted can be selected to be 300, 600, 1200 or 1800 bps. Featuring more than 150 illustrations, this practical book The maximum data rate is 9600 bps over a standard 3 kHz HF (SSB) or 96000 bps over a 24 kHz V/UHF radio link. Army uses only HF. The last ground station became active in May 2019 which was Ground Station HFDL (High Frequency Data Link) is a protocol used for radio communications between aircraft and a network of ground stations using high frequency (HF) radio waves. Characteristics of current HF narrowband modems In the nominal 3 kHz channel used for single sideband Written by the developers of the new 21st century HF (high-frequency) radio technology, thisgroundbreaking resource presents the powerful new capabilities and technical details of 3G and WBHF (wideband high-frequency) waveforms to help professionals understand and use the ionospheric channel for video and high-speed data transmission. The data link protocols, collectively known as XDL, have been integrated into the Harris RF-5800H HF man-pack radio system and are included in the Harris radio being produced for the UK BOWMAN program. (1970). The goal of the comparison is to define two operation modes LINK-11 tactical data link sends the same information in two adjacent channels, achieving some extra robustness to fading when diversity combining at the receiver takes ad-vantage of the imperfect correlation of the two channels. Jul 31, 1996 · ARINC634. , up to 125 participants can be hosted, and it can achieve data rates of 4kbps for an HF network and data rates of 12kbps for a UHF network. This paper begins with an overview of the existing XDL data link protocols defined in STANAG 4538. NET. The carrier is modulated with 1800 symbols per second (Baud). Each data link has it own dedicated ground station sub-system. We show how the multicarrier modem offers a better performance, from the bit HF Data Link employs M-ary Phase Shift Keying (M-PSK) to modulate a carrier centered at RF+1440 Hz, where RF is the nominal HF carrier frequency. It defines avionic system components and the associated HF ground system. Find the most up-to-date version of ARINC 635 at GlobalSpec. Performance data illustrates that the World's first Jan 4, 1998 · This Report provides the reader with material to enhance the understanding of high frequency data link. A description is not available for this item. High frequency SAFOC digital data link tests, R & D Techn. The link layer shall pass commands for frequency tuning, transmitter keying and transmitter/receiver switching to the As already stated in other sections of this document, data link components are divided into the on-board subsystem, the ground subnetwork, and the air-ground data link per se. io. References. Oct 18, 2019 · This group is the number one resource for everything about the High Frequency Data Link protocol (HFDL aka 'HF ACARS'), which is used to send ACARS-like messages from and to aircraft on shortwave frequencies (2-22 MHz). The station at Telde, Gran Canaria, was deployed with the cooperation and support of Spain's civil aviation authority AENA (Aeropuertos Españoles y The Satellite Data Unit (SDU) provides the satellite connectivity, and the VHF connectivity is provided by the VHF radio. HFDL is operated by ARINC as the GLOBALink/HF service, with 16 ground stations spread over the globe. Even though HF is one of the oldest voice communication methods used in the aviation industry, it was certified for datalink usage only at the start of the 2000s. I have been a hobbyist and maker for almost 15 years now. Airborne radio CNS systems and networks present in general VHF radio communication, VHF transceivers, and radio equipment with all types of VHF data links (VDL), radio automatic dependent surveillance-broadcast (RADS-B), and other VHF radio systems, equipment, and VHF ground radio stations (GRS). This document provides the reader with a snapshot of guidance material used in the course of development of ARINC Characteristic 753, "HF Data Link System," and ARINC Specification 635, "HF Data Link Protocols. Performance data illustrates that the World's first This paper has examined the new HF data link protocols defined in the U. The link layer shall provide control functions for the physical layer, link management and data service protocols. Nov 1, 2013 · The measurements reported in this paper show that 2. Light travels 50% faster through air than through glass – like in a fiber optic cable. We have two articles in relevant directions. 2. The latest data waveforms use channels wider than 3 kHz to boost data throughput and robustness. This is the same way as monitoring VHF ACARS. It operated by the company ARINC as the GLOBALink network - on behalf of aeronautical companies. Tactical Data Links TDL Overview. This standard provides a snapshot of guidance material used in the development of ARINC 753, HF Data Link System, and ARINC 635, HF Data Link Protocols. Keeping a data base of Mar 25, 2023 · Link 11 is now being replaced by Link 22 Tactical Data Link, boasting noticeable increases in capability, e. This document is referenced by: ARINC 635 - HF Data Link Protocols. Three goals were achieved: increased robustness for the standardized data rates (defined by MSN 1-6) May 22, 2019 · HFDL is short for High Frequency Data Link and is a signal used by aircraft to communicate short messages with ground stations over long distances. Advertisement. Whether you operate in oceanic, polar or remote land areas, the HFS-900D provides a cost-effective, long-range data link system for air transport class aircraft KEY FEATURES. dircon. Add to Shared Library. Elbit Systems Deutschland supports Link 11 and Link 22 with state of the art shipboard and airborne equipment. Traditionally ACARS leveraged VHF, High Frequency Data Link (HFDL), and more recently L-band satellite connectivity for ACARS communication, with the vast majority of ACARS data being carried over VHF. Apr 1, 2021 · This article is to show a new type of aircraft system design method, which decomposes the civil aircraft high-frequency data link system architecture into functional architecture, logical architecture and physical architecture, and describes the hierarchical relationship between the function, logic and physics of the system through the SysML Bundle: Doc 9741. 6. . HF ACARS, or HFDL (High Frequency Data Link) can be monitored by using a shortwave receiver and computer program. HF Data Link employs M-ary Phase Shift Keying (M-PSK) to modulate a carrier centered at RF+1440 Hz, where RF is the nominal HF carrier frequency. COM - HFLINK. Aeronautical VHF data links use the band 117. Apr 1, 2021 · Any space-time massive data may be regarded as high-frequency one, just by changing the time and/or space-time scale; for example, quite informally speaking, daily or weekly time-series data from a very long time ago to the present could be regarded as a high-frequency data. A modern data link containing the latest state-of-the-art signal processing technology. Manual on HF data link. In the video he shows how he's been able to receive HFDL from all over the world using a simple HF dipole antenna and an Airspy HF+ Data link Recording • FANS: Future Air Navigation System • FMS: Flight Management System • HFDL: HF Data Link • HFDR: HF Data Radio • IMA: Integrated Modular Avionics • LRU: Line Replaceable Unit • OCL: Oceanic Clearance • RMP: Radio Management Panel • SDU: Satellite Data Unit • VDL: VHF Data Link • VDR: VHF Data Radio Description. The simulation involves 111 Air Traffic Control (ATC) ground stations, years. Jun 1, 1998 · HF datalink. Feb 21, 2017 · Comparison of C-2 ionospheric sounder data with frequency predictions for short-range communication with man-pack transceivers in Thailand, Spec. Primarily HFDL is used to automatically convey the status and location of an aircraft to ground crews at regular Manual on HF Data Link (Doc 9741) This document provides guidance material on the implementation and use of the high frequency data link (HFDL) which is defined in the Standards and Recommended Practices of Annex 10, Volume III. In aviation, datalink communications are messages between an aircraft and systems on the ground or from one aircraft to another plane. The propagation data collected through trials and prototype systems over the last few years indicates that HFDL can provide a level of performance suitable for the ATN environment. The VHF Data Link or VHF Digital Link ( VDL) is a means of sending information between aircraft and ground stations (and in the case of VDL Mode 4, other aircraft). An overview of the HFDL system is shown as Figure 6A-1. Also see the Decoding High Frequency Data Link (YouTube) video. 1996-08-01. The ALE (MIL-STD 188-141B or FED-STD-1045) signal is transmitted at 125 baud. The goal of the comparison is to define two operation modes for two QoS; a robust mode and a high throughput mode, in order to transmit data from remote sensors Oct 12, 2023 · High-Frequency Data Link (HFDL) is used when VHF and SATCOM services are both unavailable. 975–137 MHz assigned by the International Telecommunication Union to Aeronautical mobile (R) service. Selcall and ALE HF Radios. This document also provides a baseline for further Dec 11, 2019 · Abstract. HFLINK. Every frame contains a CRC. MIL-STD-188-141B and being considered for NATO STANAGS 4538 and 4539. This has driven the need for a more capable Automatic Link Establish-ment (ALE) system that links faster and HF DATA LINK PROTOCOLS. co. Nov 30, 2023 · Data link communications provide real-time information about an aircraft's fuel status, weather information, avionics and flight systems health, and can track messages sent between the aircraft and the ground. ACARS (pronounced AY-CARS) is a digital data link system for the transmission of messages between aircraft and ground stations, which has been in use since 1978. S. The intent of this document is to provide general and specific design guidance for the development and installation of the protocols Data link Recording • FANS: Future Air Navigation System • FMS: Flight Management System • HFDL: HF Data Link • HFDR: HF Data Radio • IMA: Integrated Modular Avionics • LRU: Line Replaceable Unit • OCL: Oceanic Clearance • RMP: Radio Management Panel • SDU: Satellite Data Unit • VDL: VHF Data Link • VDR: VHF Data Radio Jul 14, 2021 · HFDL is short for "high frequency data link", and is a method aircraft use for sending text and data communications to ground stations. This Report provides the reader with material to enhance the understanding of high frequency data link. From 2007 to 2009 NILE nation Germany contracted German industry to enhance performance and tactical capabilities for Link 22 HF fixed frequency (FF) operation. A link-layer handshake is required to reverse the flow. HDL+ is currently being considered by the NATO HF radio ad hoc working group as an enhancement to S4538. ukLicense Yes. 15, Stanford Research Institute, Menlo Park, CA, USA. In this chapter HF radio systems and HFDLP. This standard describes the functions to be performed by the airborne components of the HFDL to successfully transfer messages between HF ground stations and avionics systems on aircraft where the data is encoded in a bit-oriented format. ARINC 634 and ARINC 635 are companion standards. But, Link 11 is expected to remain the chief naval tactical data link for another ten years; it High frequency ( HF) is the ITU designation [1] for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz). over oceans or polar regions) where other ground-based Improved HF Radio communication by using the NATO standard STANAG 5066 HF link layer. Communication is modeled for essentially all incoming and outgoing nonstop air traffic for just three United States cities: Cleveland, Cincinnati, and Detroit. Thanks to the ability of short waves to propagate over long distances, HFDL is particularly useful in remote areas (eg. Photo: F4HDK. The ground station, located at self-contained natively compiled application; memory and processor efficient; optimized for embedded systems (i. Rep. HF DATA LINK (HFDL) The SP 2310 Airborne HFDL system provides main airborne platforms with the capability for HF voice and data communications. 2 kbps • ARINC 635 High Frequency Data Link (HFDL)* • Embedded SIMOP filtering • NTIA certified 400-watt PEP Dec 7, 2015 · Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software. This form of ground-based communications provides an effective long Oct 25, 2019 · Data links work over the medium-range UHF band, but for the best results, a directional antenna is used. I like inventing HFDL (High Frequency Data Link) is a protocol used for radio communications between aircraft and a network of ground stations using high frequency (HF) radio waves. k Y I zyxwvu zyxwvu ACARS CPS Figure 1. The basic concept of TDL is to exchange standardized short messages over a shared communications channel, in particular UHF and HF Radio. Aircraft can send and receive ACARS data during any phase of flight, at any time, and almost anywhere an aircraft is located world-wide. The Link 22 SPC provides all required modem functions for system usage in high-frequency (HF) or ultra-high frequency (UHF) communications. The data link protocols developed by Harris Corporation and discussed in this paper, HDL+, apply the code combining concepts to the higher capacity data waveforms of S4539. 4 kbit/s Power classes: 150 W, 500 W, 1 kW and 4 kW (HF Controller Pilot Data Link Communications (CPDLC) over the Very High Frequency Data Link Mode 2 (VDL-2). ARINC inaugurated its GLOBALink/HF service on January 28 when ARINC declared the first HF datalink (HFDL) ground station online. TADIL-A can be used on either high frequency (HF) or ultrahigh frequency (UHF). It is the primary means to exchange data such as radar tracking information beyond line of sight. It is often used in place of VHF ACARS when flying over oceans. The High Frequency data link (HFDL) design is based on the MIL-STD-188-110A and has been recently considered as suitable for Aeronautical Telecommunications Network (ATN) utilization. In his video Shortwave Bavaria uses a 26. The Link 22 Operational Management Application (LOMA) enables the design of performant networks with minimal congestion, then mapped into an associated Operational Tasking Data Link (OPTASK LINK) message. The HF frequencies listed above can be found here as a zip file. hflink@groups. HDL+ is currently being considered by the NATO HF Radio Ad Hoc Working Group as an enhancement to S4538. High Frequency, radio-based, intercontinental ultra-low latency data network. The CPDLC application provides air-ground data HF Data Link Protocols Customers who bought this document also bought: NAS-410 NAS Certification and Qualification of Nondestructive Test Personnel MIL-H-7199 Heat Treatment of Wrought Copper-Beryllium Alloys, Process for (Copper Alloys: Numbers C17000, C17200, C17300, C17500, and C17510) (Superseded by SAE-AMS-H-7199) DODISS-CD-ROM-SUBSCR Aug 1, 2007 · The data link protocols, collectively known as XDL, have been integrated into the Harris RF-5800H HF man-pack radio system and are included in the Harris radio being produced for the UK BOWMAN HF DATA LINK PROTOCOLS: Scope; This standard describes the functions to be performed by the airborne components of the HFDL to successfully transfer messages between HF ground stations and avionics systems on aircraft where the data is encoded in a bit-oriented format. e. At the highest level, the concept is simple, with the emphasis on the continued involvement of the human at either end and the flexibility of use. HFLINK is the HF Automatic Link Establishment HF Interoperability international resource for ALE High Frequency Communications, HF Digital Messaging, Emergency / Disaster Relief, Interoperative HF Communications, HF Network, Ham Radio. It is legal under FCC Rules for use in the Amateur Radio Service for DATA MODE transmission on HF in the DATA sub-bands. Exhaustive data about the impairments of this HF link have been gathered since 2003 and several performance parameters have been measured such as availability, SNR, delay power profile and Doppler spread Abstract— Progress in signal processing continues to enable welcome advances in high-frequency (HF) radio performance and efficiency. 11. g. domestic en route operations, Very High Frequency Data Link (VDL) Mode 2 (M2) is required and the airplane navigation system must have “push to load” capability enabling the pilot to incorporate received routing changes (UM79, UM80, and UM83) into the flight management system (FMS). This document provides the reader with guidance material to be considered in several areas within the HFDL system, including the airborne avionics, the propagation media and the Dec 22, 2003 · Abstract. Aug 30, 1996 · Purpose: The purpose of this document is to provide the reader with material to enhance the understanding of High Frequency Data Link. The HFDR or the HFDU provides the capability to communicate over the HF medium. Add to My Library. It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters). Mar 22, 2024 · A waterfall for HFDL can be found here. Raspberry Pis) abstract enough to work with multiple data links (analog VHF, digital VHF, HF data link, SATCOM data link) Jul 13, 2000 · This paper has examined the new HF data link protocols defined in the U. HF Data Link System. It is an alternative to VHF or satellite ACARS communications methods. Edition 1. ARINC753-3. ARINC Incorporated announced an enhancement to its GLOBALink HFDL (High Frequency Data Link) communications service with the deployment of a 14th HF network ground station in the Canary Islands. The guidance material covers several areas within the HFDL system, including airborne avionics, the propagation media The Rockwell Collins HFS-900D high frequency data link (HFDL) system is the premier choice for HF Data Radios in its class. It can also refer to a set of electronics assemblies, consisting of a transmitter and a receiver (two pieces of data terminal equipment) and the interconnecting data telecommunication Jul 23, 2003 · Among the various automated HF technologies tested, the new HDL+ data link protocol, suggested for standardization within NATO, shows the best throughput capabilities for short to medium-size Nov 5, 2015 · This paper presents the comparison of the BER performance between SC-FDE, orthogonal frequency division multiplexing (OFDMA) and single-carrier frequency division multiplexing access (SC-FDMA) in a long haul HF data link with low SNR. For U. Multi-TDL network ( MTN) refers to the network of similar and dissimilar TDLs integrated through gateways, translators May 9, 2024 · High-frequency (HF) radio waves are capable of extremely long-distance communications links. over oceans or polar regions) where other ground-based HFLINK is the international resource for ALE Automatic Link Establishment and Selcall Selective Calling High Frequency Communications, HF Digital Messaging, Emergency / Disaster Relief, Interoperative HF Communications, HF Network, Ham Radio. HFDL is defined in ARINC spec 753. Mar 30, 1999 · STANAG 5066 "Profile for HF Radio Data Communications" has been developed through a cooperative venture between DERA, Portsdown West, UK, and the NATO C3 Agency, the Hague. 5m end fed wire, and a Cloud-IQ SDR. yw xw tw bp yb ne ap vd xu oh