My radio app
Radio wave distribution is a very complex method. It is impossible to precisely predict how dunes will spread as well as what values we will determine at some particular point. Therefore we incorporate some mathematical models in order to approximate radio reproduction and to calculate field strength values as outlined by predefined probability.
app for radio
The propagation model, that is based on electromagnetic theory and on statistical evaluation of both surfaces features and radio measurements, predicts the actual median attenuation of the stereo signal as a objective of distance and the variability of the signal with time and in space. Distribution models define shape and formulas. Basic model we can forecast propagation in haphazard distance from the transmitter.
Using curves and precise formulas manually is definitely a tough task. So that you can automate and accelerate such calculations several software tools were designed. Normally, radio organizing software packages are used by broadcasters, mobile operators and radio frequency authorities. Because of complexity and small number of potential customers, the price of these kinds of software package can be rather high. But there is one exception to this rule.
Radio Mobile is often a software tool for radio stations propagation calculation. Mcdougal has decided to publish this under the “freeware” license so that the software is freely available on the web. This software is usually dedicated to amateur stereo, however, it can be additionally used in other areas such as broadcasting and professional mobile communications.
Calculations are based on the Longley-Rice propagation model. This is a general purpose radio propagation model for wavelengths between 20 MHz and 20 Ghz. In order to use the software in addition, you need terrain product data. This info is needed for calculations regarding effective heights which can be needed to perform reproduction calculations. You can find a few terrain model info sources on the web. They offer free DTM (Digital Surfaces Model) data which is enough to start dealing with the Radio Mobile.
Radio stations Mobile supports a lot of fancy features like possibility to use DTM in a variety of formats (DTED, SRTM), also in numerous layers with different solution, possibility to add road pictures in raster formatting (BMP, JPEG, GIF, TIFF, PNG), possibility to determine interference between radio stations and lots of functions a customized view.
Basic way of use consists of getting into radio stations with all details (if they are not came into yet) and formula of the coverage. The following you have a lot of options to customize the calculation and consider. Results can be saved for later use. It is also very easy to define calculation phase for coarse calculations to save some time.
Regarding result display it is usually not enough to display this on the gray scale DTM. You would probably like to see this on some map. For this purpose you can use any kind of map picture with known coordinates. The software program allows you to enter harmonizes for each picture as a way to display it appropriately over the DTM.
A very useful function is the formula of interference among radio stations. You outline protection ratio as well as minimum field strength for calculation and the software marks interference area with defined color.
The software is also very useful for micro-wave link planning. It allows you to display surfaces profile between two points, display regarding optical visibility on the point and calculation of link variables. Although this software is no cost and dedicated with regard to amateur radio it is usually very useful tool regarding daily radio connection tasks.
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