Main → HF Radio Resource Center

Section devoted to the design, building and simulation of HF antennas. The simulations are performed using 4Nec2, MMANA-GAL and HFAnt.

Construction of magnetic loop antennas for reception and transmission in the HF band.

Notes and recommendations about antenna simulations using software based on the NEC-2 algorithm, developed by the Lawrence Livermore National Laboratory. The recommendations and rules of design have been compiled both from the manuals of some programs and from technical articles about antenna simulation.

Article published in the Spanish Amateur Radio Union Magazine (URE). December 2012.

Aug 2012.

The HF Panel offers a compilation of resources about the HF propagation status in real-time: space weather, ionosphere and magnetosphere status, measurementss of MUF and foF2 for HF radio links, ionospheric absorption, aurorae, grey-line propagation, optimal working frequencies and special bulletins.

The panel is available in versions for PC and mobile devices.

An user's Manual of the EA4FSI's HF & Space Weather Panel.

This Manual is also oriented to serve as support material to study the propagation in the HF band.

Article about the Near Vertical Incident Skywave (NVIS) HF propagation mode, used at great length in emergency and tactical communications.

The article was published in the Spanish Amateur Radio Union (URE) magazine, in november 2008.

A methodology for the planification of frequencies in the HF band, taking into account the network topology, its technical parameters, the ionospheric propagation conditions and the working bands with frequency allocations. Available in Spanish only.

The article was published in the Spanish Army Signals and Engineering School Magazine (Memorial de Ingenieros), in July 2014.

Jul 2014.

Transcription of the original article by the then Captain Julián Iranzo Collado of the 21st Tactical Signals Regiment of the Spanish Army, published in the "Memorial del Arma de Ingenieros" (Spanish Army Corps of Engineers Magazine), nº37, year 1989. Reproduced with permission. Available in Spanish only.

Jul 2014.

Transcription of the original article by the then Captain Julián Iranzo Collado of the 21st Tactical Signals Regiment of the Spanish Army, published in the "Memorial del Arma de Ingenieros" (Spanish Army Corps of Engineers Magazine), nº39, year 1990. Reproduced with permission. Available in Spanish only.

Jul 2014.

Educational video about the evolution of the different layers of the ionosphere during a whole day, analyzing data gathered by the ionospheric sounding station at El Arenosillo (Huelva, Spain), a facility belonging to the Spanish National Institute of Aerospace Technology (INTA).

Works about propagation calculations and forecasts in the HF band developed by Alonso Mostazo Plano (EA3EPH), using his software "Sondeo".

An user's manual of W6ELProp, the HF link calculation software developed by Sheldon C. Shallon (W6EL). Includes practical examples.

An user's manual of PropView, a HF link calculation software based on the IONCAP model.

Report presented in November 2010 to the Spanish General Directorate of Civil Protection and Emergencies (DGPCE), on the occasion of the Technical Congress on Space Weather. The article provides a description of the Space Weather phenomena and an analysis of the risks for people and several technological systems, among them the HF radio communication systems. The article also provides a description of the observation and early warning systems currently available in several countries.

Lecture on the impact of the severe Space Weather events on the terrestrial radio communication systems, presented in the Spanish National Civil Protection School (General Directorate of Civil Protection and Emergencies, Ministry of Interior) during the "Conference on Space Weather", 23-24 March 2011. Available in Spanish only.

Mar 2011.

Technical description of the radio direction finding systems type Adcock/Watson-Watt, based on the employ of four monopololes with an additional sense monopole to avoid ambiguities. Those systems are commonly used in military environments (SIGINT), radio navigation and radio direction finding during emergencies, in the MF, HF, VHF and UHF radio bands. The theoretical explanation is backed by radiation patterns made with 4Nec2 and the analysis of the demodulated signals using a function plotting software.

Aug 2012.

A collection of terms related with radio communications in the HF band.

The collection has currently 202 terms (v8, 28MAY14).

Ismael Pellejero - EA4FSI
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