Hot answers tagged

11

Although much of the main page is not written in English, after you login most of the site is and the RMO Repeater coverage map maker is a wonderful and highly customizable tool even for multi-site repeaters. VA3XPR.Net: Three easy steps to creating RF coverage maps like a pro: Radio Mobile Online is a radio wave propagation prediction tool created ...


7

The maps are related, but as this excellent posting describes: The 'critical frequency' is the highest frequency that gets reflected when it is aimed straight up at the ionosphere. However: …as the angle decreases from vertical the reflected frequency increases. And so therefore: MUF or MOF is a path dependent value. It depends not only on the ...


7

SPLAT! is an RF Signal Propagation, Loss, And Terrain analysis tool for the electromagnetic spectrum between 20 MHz and 20 GHz. It is free and open source, and there are builds for Windows and Mac if you don't want to compile from source on linux yourself. I haven't used it, so I can't speak to ease of use, but it should generate propagation maps based on ...


4

The map projection used in the mentioned webpage is a cylindrical map projection, with the degrees latitude and longitude marked off on the left and bottom edges. Each 10 degrees latitude is about 24 pixels, and each degree longitude is about 27 pixels. It shouldn't be too hard to take each pixel and convert it to a latitude and longitude from this data. ...


4

Assuming for the sake of precision that the particular point in the grid square that you want the exact latitude and longitude for is the midpoint of the 6-character subsquare, this can be done readily with Excel formulas. If the 6-character grid square data is in cell A1, in a format similar to AA00aa (i.e. upper-case, then digits, then lower-case), the ...


1

Function FromMaidenhead(m As String) As Variant Dim lat As Double, lon As Double lat = (Asc(Mid(m, 2, 1)) - 65) * 10 + Val(Mid(m, 4, 1)) + (Asc(Mid(m, 6, 1)) - 97) / 24 + 1 / 48 - 90 lon = (Asc(Mid(m, 1, 1)) - 65) * 20 + Val(Mid(m, 3, 1)) * 2 + (Asc(Mid(m, 5, 1)) - 97) / 12 + 1 / 24 - 180 FromMaidenhead = Format(lat, "00.000000" & "° ") & Format(...


1

Ham Radio Deluxe is a popular package for doing what you want to do as for the first part of the question. Actually, QRZ.com can do that too via its web site features -- although I have found that at times it contains errors in the geo-location features. I don't use Ham Radio Deluxe but I have made use of QRZ.com web site via their call sign lookup ...


1

Ham Radio Deluxe's logger can plot contacts on a map or a globe. Regarding the second part of your question, in ham radio when talking about effective transmission area, the term that is generally used is "propagation". Propagation varies quite a bit depending upon the band; propagation on the nighttime HF bands (160m – 40m) is quite different from ...


1

There is not any such listing, as the definitions for CQ zones are a bit ambiguous. The official definitions can be found at the CQ Magazine WAZ award definition. Areas like the ocean aren't covered, otherwise it's a fairly simple geography lookup to get the areas defined.


Only top voted, non community-wiki answers of a minimum length are eligible