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David Jacobowitz david.jacobowitz at gmail.comI originally posted about 115.8 and 116.8 MHz, both square in the VOR band of 108 to 117.95. I might have sent something else in a PM, but if so it was a typo. :-) I am definitely only interested in the VOR band right now -- though, as you say, it is adjacent to commercial FM with its high power. My application is simple in concept: A fully auomatic VOR-based positioning system, a fallback from GPS. I want to scan the entire VOR band, looking for signals in the standard VOR format that can be demodulated. I do the initial scan with a fast sample rate and FFT, just looking for peaks. From those, I examine the signals to see if it looks like a VOR signal. From that list, I will "park" on each signal long enough (~30s) to decode the VOR's morse code station ID. From that, I will have a short list of VORs that I can currently receive. From those, if the geometry is appropriate (I know the VORs positions from a database) I can calculate a position. The software then just round-robin tunes the VORs in range and continually tries to calculate positions. If too many drop out, it returns to the initial scan mode. Not being able to receive this VOR or that VOR is not generally a problem, but obviously, the more the better. With extra VORs I have better options for choosing the closest ones or the ones with the best geometry. This is actually quite difficult to test, because VORs can generally only be received line-of-sight -- which means in the air. I'm a private pilot but I found that flying and noodling with a laptop is too much trouble.