![]() ![]() This is ideal for preppers and survivalists who have concerns about not having internet access in a SHTF scenario. I’m not sure how accurate the predictions are, but if the government uses them, they are probably good. You can produce charts predicting propagation out into the future. It tells me that on 15 meters (the pink line) I have a 77% chance of making a contact at 1900 UTC. The example below is for a path between Florida, USA and eastern Africa. This factor tells you how likely it is you will be able to make a contact, expressed as a percentage. VOACAP is capable of numerous different calculations, but the one that means the most to hams is “circuit reliability”. From there it will produce a graph with a curve for each ham band and how well it will work between the two entered points. ![]() They offer numerous choices for the TX and RX QTH in a drop down window, or you can drag-and-drop points on the world map. All you need to do is enter data for the transmitter and receiver on the main entry page. This algorithm would be useful to hams too, if only someone would put together a civilian version and offer it on line for anyone to use.Ĭlick here to access the VOACAP calculator. The Voice of America Coverage Analysis Program (VOACAP) was developed by the VOA to predict propagation paths and frequencies for VOA broadcasts. There are many other similar calculators, but these are especially well done and highly recommended. I always seem to find the coolest stuff when I’m looking for something else! While researching for a future Off Grid Ham article I happened across two on line propagation calculators that can determine what HF bands are best for any time or operating condition. ![]()
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