VHF/UHF Radio Resource Center
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Welcome to the VHF/UHF Radio Resource Center. This page is the focal point for all resources related to VHF and VHF radio communications in EA4FSI's web site. Use the options on the left frame to navigate. All the contents are available in Spanish and some of them also in English. If you want to contact the author, please use this form.
Esta página también está disponible en Español (this page is also available in Spanish).
VHF/UHF Antennas
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Section devoted to the design, building and simulation of VHF and antennas. The simulations are performed using 4Nec2 and, MMANA-GAL.
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A Radio Mobile user's tutorial in Spanish
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Manual in Spanish depeloped by EA4FSI for radio coverage calculations using Radio Mobile. The manual also describes how to use the SRTM and GTOPO30 digital elevation models. If you are looking for information about Radio Mobile in English or French, please visit the Radio Mobile official site.
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The Ancora Project
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The Ancora Project consists on the creation of a GIS over Google Earth with data of interest regarding the national network of VHF radio repeaters of the Spanish Civil Protection's Emergency Radio Network (REMER), such as positioning and detailed radio coverage maps. In addition to this, the repeater database is exported to other formats such as Oziexplorer, TomTom Navigator and UIView, allowing to be used with portable navigation and fleet control systems.
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Installation of VHF/UHF monopoles at different heights
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Analysis of the effects derived from installing a VHF/UHF monopole at different heights over ground, made with 4NEC2. The optimal heigths are determined and also the heights to be avoided, as a function of the calculated gain taking into account the antenna, the mast and the ground plane. |
VHF/UHF monopole ground planes with 4 radials
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Analysis of artificial ground planes for VHF/UHF monopoles, performed with 4NEC2. Includes ground planes made of 4 radials at 90 degrees and 45 degrees. |
Analysis of the radio contacts between the Canary Islands and South America 2010 in the 50 MHz band in March 2010
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Propagation study on the contacts made by amateur radio stations between the Canary Islands (Spain) and several countries in South America, in the 50 MHz band, between the days 17-21 March 2010. |
Notes on antenna simulation using NEC-2
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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. Aug 2012. |
Adcock/Watson-Watt Radio Direction Finding
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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. |
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Ismael Pellejero - EA4FSI |