Our club wants to set up some RDF sites to automatically find jammers and display their locations on the Internet. How do we do it?
First, understand that you won’t be able to use such a system to positively identify RF coming from a specific house or apartment at a distance. Let’s say you set up a RDF system with three sites to cover a typical urban area of 20 X 20 miles. For good coverage of the area, the sites will have to be on the perimeter. Assume that you can find enough quiet sites and link them. Now assume that the jammer is right in the middle of the triangle of sites (best case). The intersection of your bearings and their uncertainties will create a polygon with an area of about 4 square miles! That certainly won’t be good enough evidence for the FCC. There are about 10 hams per square mile in my city, probably the same as where you live. So you’ll still have to do plenty of close-in DFing to verify the actual perpetrator’s site and get eyewitness evidence. Why the large polygon? Because the inherent uncertainty of a bearing from a typical VHF 4-whip Doppler in an urban environment is about +/- 5 degree
Related Questions
- Our club wants to set up some RDF sites to automatically find jammers and display their locations on the Internet. How do we do it?
- If an organization wants to apply and has multiple sites or locations, does each site need to submit a separate application?
- Does Glo display at any other locations besides on the internet?
