On Wed, 9 Oct 2019 at 02:26, Allen Mulvey wrote: > I've never done anything like this but I wonder if you could > avoid the rotating direction finder and have a non-moving > solution. Perhaps with a couple of stations along the > perimeter of the field with two directional antennae > pointing in somewhat different directions you could > interpolate the difference in signal strength to get a > bearing from each? > > I mentioned the POSSIBLE use of rotating tx or rx as it adds a degree of information input not easily available with static solutions. Rotation could be using phased arry but that seems vanishingly unlikely to be attractive here. A mechanical scanner adds time domain (OK, time) variation and a periodicity to the signal and a signal which has a shaped "lobe" as the tx-rx path aligns and the dealigns once per rotation. Watching that by eye on eg an oscilloscope would make it very clear in most cases which was the real desired path and which the varying spurious paths. Analysis 'programmatically is far harder but the cyclical peaks are liable to help heaps [tm]. Russell --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .