[rescue] Radio DF equipment (was Ham radio license question)
G W Adkins
rescue at sunhelp.org
Wed Jun 13 09:59:32 CDT 2001
> So now you have two points and can draw a line on which the noise source
> lies. I forget exactly how the ramsey kit determines which doppler null
> is the one that points toward the target...I'd have to go dig up the books
> from the basement...but I remember it having something to do with audio
> Now...when you induce a doppler shift on a signal and attempt to decode it
> through an FM detector, the doppler shift induces a tone in the audio.
> that tone is indicative of the doppler shift amount. If you know that and
> your angular position in the described circle, you can plot your nulls on
> the circle and then draw your line.
wouldn't it be simpler to plot the peak and trough and add/subtract 90
degrees from the peak (depending on the rotation)?
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