[FoxHunt] Doppler antenna switching.

[WBob]

Well I thought they had concluded early on that it makes
little difference if the rotating phase center of the
antenna is circular or square or even triangular. The
resulting angle error is very small since the squareness all
gets rounded off in the very narrow filter. 

WBob

Ron Graham wrote:
> 
> Just acquired a surplus Datong Electronics (UK manufacture) doppler unit.
> Interesting thing  .. it uses sine wave switching of the antennae.
> Wonder if anyone has come across this before?
> Wonder if it offers any advantages over the more normal square wave switcher?
> 
> The sine wave switching signals are generated in the antenna unit without
> any reference (sync. ) to the main display .. also intriguing????
> 
> Ron, VK4BRG.
> 
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