> Ok, thanks. The frequencies I measured are a few Hz off, but close
> enough. Given 981 (980) for 0 and 655 (652) for 5. Ordering by frequency
> (and guessing the ones not used) would give a code like in the attached
> image. That leaves a problem: What to do with the -1?
>



Are the coordiantes usually in that format?

Why not:



??

Or do you always have 3 numbers after the point, meaning that the minutes 
must be under 10?

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