High frequency and vhf radio propagation data, solar and geomagnetic realtime and historic data, sunspot activity reports, as well as forecasts. Introduction waves were launched nearly vertically 70 when satellite communication and cellular networks become unusable due to local disasters or catastrophes, a convenient emergency telecommunication alternative is the use of high frequency. These maps are made from data gathered in real time around the world using hf ionospheric radar systems called ionosondes. Viscous damping formulation and high frequency motion propagation in nonlinear site response analysis article pdf available in soil dynamics and earthquake engineering 227. Remcoms xgtd software is a high frequency solver capable of calculating the radar cross section of electrically large objects. This guide should get you well started with voacap. Since dec 1992 the following hf propagation models for windows pcs are available here.
Radio propagation is the behavior of radio waves as they travel, or are propagated, from one point to another, or into various parts of the atmosphere. Hf propagation radio society of great britain main. The links below provide information about high frequency propagation. Many are free, such as the hamcap software from alex shovkoplyas ve3nea. High frequency acoustical propagation and scattering. It operates in a range of three to thirty mhz and as the wavelengths spread over ten to one hundred meters, it is also known as decameter wave and designated as band 7. Hf propagation prediction is a statistical science. A swept spectrum analyzer cored setup was used in parallel to a software defined radio platform. This workinprogress guide should get you well started with the software.
Ntia does not make any warranty of any kind, express, implied or statutory, including, without limitation, the implied warranty of merchantability, fitness for a particular purpose, noninfringement and data. Jan 20, 2020 the k factor is the difference between performing radio propagation studies as line of sight paths and actual radio paths. High frequency radio propagation current optimal frequency. All predictions are performed using the itus iturhfprop application. The hps high frequency propagation system waveguide was initially designed at adam audio for the sart tweeter of the s series range with the aid of the latest computer modeling techniques. Ntia does not make any warranty of any kind, express, implied or. The software contained within was developed by an agency of the u. A comprehensive propagation resource compiled by tomas hood, editor of the propagation columns of cq, cq vhf, popular communications, and monitoring times magazines. To help you be in the right place at the right time, propagation prediction programs are available.
Click on thumbnails to view a larger image images courtesy of the noaa auroral activity site. High levels of aurora can also make hf ham radio propagation via polar routes difficult. Ntiaits has no objection to the use of this software for any purpose since it is not subject to protection in the u. The software lies within system utilities, more precisely general.
Its hf propagation, free its hf propagation software downloads. This is a workinprogress guide to using voacap voice of america coverage analysis program free professional hf propagation prediction software from ntiaits, originally developed for voice of america voa. Its hf propagation software free download its hf propagation. This free software is a product of institute for telecommunication sciences. Acehf system simulation and visualization software, v2. Review of propagation prediction programs voacapbased. A portal that hams think of as the first place to go for information, to exchange ideas, and be part of whats happening with ham radio on the internet. Acehf pro is the most advanced and the most accurate high frequency ionospheric radio signal propagation modeling and forecasting software for amateur. Please note the rsgb is not responsible for the content of external websites. High frequency propagation models icepac, voacap, rec533 disclaimer. The maximum usable frequency muf is the highest frequency that, with a probability of 50% of the time, can be used for radio communication between two points at a specified distance but not necessary in all directions via refraction by the ionosphere.
It lies between the super high frequency band, and the far infrared band, the lower part of which is the terahertz band. No transmission of sound around the barrier therefore, the combined transmission of sound around the sides of the barrier must be at least 10db below the level of sound transmission. Any white bubble indicates no suitable frequency or high absorption. Asaps course hf radio propagation course hf radio propagation manual. Jul 24, 2015 this site is dedicated to voacap voice of america coverage analysis program for hf propagation prediction and ionospheric communications analysis, an improved and corrected version of ioncap, retaining all of the theory as put forth by john lloyd, george haydon, donald lucas and larry teters in the 19751985 timeframe with modifications which were suggestedapproved by george lane, donald. High frequency propagation current optimal frequency chart us west coast for shortwave swl and hf radio. Richard and sue buckner teamed with joe ahlgren author of geoclock and steve biro to create a dynamic system simulation and visualization software package which uses the voacap propagation prediction engine to create animated maps and charts to help all users of hf radio choose the best times and frequencies. The downloads made available through links on this page contain software developed by ntia.
To build the largest and most complete amateur radio community site on the internet. Extremely high frequency ehf is the international telecommunication union itu designation for the band of radio frequencies in the electromagnetic spectrum from 30 to 300 gigahertz ghz. Kennedy special warfare center and school student uses a pda184 computer during nighttime antenna training at fort bragg, north carolina. Hfwin32 windows all operating systems 32bit versions of icepac voacap rec533.
Us west coast for may 2020 using the predicted smoothed sunspot number ssn. Accordingly it is often necessary to have a good understanding of what is radio propagation, its principles, and the different forms to understand how a radio. In this paper, interference from wind turbines is predicted using xgtd simulations. Irregular terrain model itm longleyrice 20 mhz 20 ghz. Usable hf frequencies page refreshed every 20 minutes use the indicated color red, yellow, green, blue, white, etc. Sound propagation level calculator noise tools by mas. This interactive sound propagation level calculator is an approximate calculation tool and should not replace your own calculations and real life measurements. In addition to creating a pretty light show mostly in upper latitudes, ham radio signals scatter off of these particles and can greatly enhance propagation on the vhf and uhf ham radio bands. Winprop software for wave propagation and radio planning. Tarma no longer would support new windows versions. Understanding the effects of varying conditions on. Antennas, satellite broadcasting, and emergency preparedness for the voice of america. The project has been substantially revised and is to be carried out with muri funding under the acoustic communications topic. High frequency propagation current optimal frequency chart eastern europe for shortwave swl and hf radio optimal working frequencies mhz for.
Demystifying hf radio propagation and modeling check out the acehf propagation software the latest is version 2. Winprop radio planning tool with highly accurate wave propagation models for rf coverage prediction in rural, urban, indoor, tunnel, stadium scenarios. Operating on the highfrequency hf ham radio bands can be very exciting as conditions change around the world. Check out the acehf propagation software the latest is version 2. Hflink hf automatic link establishment hf ale hf network. The color frequency at your location is the optimum frequency for f2 layer nvis communication. High frequency waves have a much longer wavelength, which promotes two additional propagation modes. Wind turbines located near radar installations can significantly interfere with a radars ability to detect its intended targets. Master of science engineering technology, december 2002, 87 pp.
As a form of electromagnetic radiation, like light waves, radio waves are affected by the phenomena of reflection, refraction, diffraction, absorption, polarization, and scattering. High frequency acoustical propagation and scattering in. For interesting plots of amateur propagation analysis see pages from g3cwi, including scattergrams, chirp soundings, pedersen ray doppler plots. The k factor is the difference between performing radio propagation studies as line of sight paths and actual radio paths.
Ntia does not make any warranty of any kind, express, implied or statutory, including. The radio signal attenuation is more pronounced for the higher frequency mobile bands. Current sunspot cycle activity, space weather, solar storm. Hfworks solves electromagnetic radiation, electromagnetic waves, electromagnetic propagation, electromagnetic interference emi, electromagnetic compatibility emc, and signal integrity. Ntia does not make any warranty of any kind, express, implied or statutory, including, without limitation, the implied. Acehf is propagation forecasting and modeling for amateur radio as well as for shortwave radio listening and general hf operation. Acehf professional propagation software for hf radio operators solar data plotting utility by scott craig. It is also worth noting that k is another of the variables that changes with atmospheric conditions. Predicting propagation in ham radio with voacap online. Radio mobile rf propagation simulation software radio. Voice of america coverage analysis program for hf propagation prediction. Institute for telecommunication sciences resources radio propagation software high frequency high frequency propagation models.
Institute for telecommunication sciences resources radio propagation software high frequency windows 32bit hf propagation models. Electromagnetic analysis 20171030 microwave journal. About acehf propagation prediction software the resource is currently listed in in a single category. High frequency propagation current optimal frequency chart central south america for shortwave swl and hf radio. Weak signal propagation reporting wspr with the limesdr mini i attached a cheap 1w highfrequency hf amplifier to the limesdr mini, explains system administrator and amateur radio enthusiast kiril miloshev, and with its help i was able to reach japan, the us, iceland, the canary islands and lots of europe countries from my home in. While listening or planning to work a dx station, the radio amateur would like to know what are the current propagation conditions, know if the propagation is open toward a specific location at a specific time, or at what time the band will be open for a specific pointtopoint circuit. Hf propagation prediction the tools provided by this web application enable users to predict available frequencies, signal levels and corresponding reliabilities for high frequency hf circuits. Antenna and electromagnetic simulation software for. Acehf propagation prediction software ace hf pro, ace hf mobile are radio frequency rf propagation analysis tools designed for military applications. Predicting propagation in ham radio with voacap online dummies. At high microwave frequencies radio path loss increases as a result of precipitation or even moisture in the air. These maps are made from data gathered in real time around the world. Radio waves in this band have wavelengths from ten to one. View the news files that detail the changes made for each version of the software.
Propagation of radio waves in the high frequency band, which depends entirely on reflection from the ionosphere explanation of high frequency propagation. The radio signal path loss may vary according to the weather conditions. Animated communications effectiveness for high frequency software. Pdf viscous damping formulation and high frequency. Highfrequency propagation article about highfrequency.
High frequency communications features highs and lows. Acehf propagation prediction software professional pc software for hams that uses voacap and includes area coverage maps animated by time or frequency. The software provides efficient and accurate predictions of em propagation and communication channel characteristics in complex urban, indoor. The online prediction service voacap online is easy. Find out information about high frequency propagation. Near vertical ionospheric skywave propagation in the high frequency range. System and measurements for analysis of near vertical. This link is listed in our web site directory since monday jun 17 2002, and till today acehf propagation prediction software has been followed for a total of 9389 times. Voacap voice of america coverage analysis program is free professional high frequency hf propagation prediction software from ntiaits, originally developed for voice of america voa. Voacap voice of america coverage analysis program is free professional highfrequency hf propagation prediction software from ntiaits, originally developed for voice of america voa.
Shallon, w6el predicts ionospheric skywave propagation between any two locations on the earth on frequencies between 3 and 30 mhz. The hps highfrequency propagation system waveguide was initially designed at adam audio for the sart tweeter of the s series range with the aid of the latest computer modeling techniques. The purpose of this research was to determine which of the commonly used. Acehf propagation prediction software resource detail. The main category is propagation tools that is about propagation prediction software for ham radio. Exe will detect and remove the w32zotob worm and its variants completely from your system. Hfworks is an antenna and electromagnetic simulation software for rf, microwave, mmwave, and high frequency and high speed electrical and electronics devices and circuits. Irregular terrain model itm longleyrice 20 mhz 20 ghz if77 wave propagation model gierhartjohnson airground. High frequency hf is an electromagnetic frequency defined by the international telecommunications union itu for radar and radio communications.
Department of commerce ntiaits institute for telecommunication sciences high frequency propagation models. Propagation of radio waves in the highfrequency band, which depends entirely on reflection from the ionosphere explanation of highfrequency propagation. It hones the dispersion of the speakers to an even, uniform consistency, broad in the horizontal axis but tightly focused in the vertical plane. Assumptions no transmission of sound around the barrier therefore, the combined transmission of sound around the sides of the barrier must be at least 10db below the level of sound.
Ntiaits has no objection to the use of this software for any purpose since it is. Our familiar marine vhffm very high frequency radio waves propagate almost entirely in a straight line as a direct wave, limited by lineofsight distance to the horizon. Weak signal propagation reporting wspr with the limesdr. Please see the software downloads page for details of which platforms are. Institute for telecommunication sciences resources radio propagation software radio propagation software. Lightspeed offers two forms of automated trading solutions. Radio frequency propagation differences through various. Solar weather, sunspot activity, geomagnetic, aurora, ionospheric reports via.
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