[hpsdr] Direction Finder using Dual-Mercury Diversity Operation

[Curt, WE7U]

On Thu, 22 Sep 2011, Kjell Karlsen wrote:

> I have been using a Doppler Direction Finder in SAR helicopters but it is not 
> easy to listen to the received signal as the scanning frequency is overlaid 
> the signal. This gave an unpleasant feeling at least in my head.

If using a Mercury type of setup, could rotate the antennas at a higher clock rate and cause the audio tone to be above the hearing range, or at least above the high-pass audio filter cutoff.

You could do that with a regular doppler scanning setup too, but you'd then have to tie into the radio before the audio circuitry and the low-pass filter, plus stay inside the IF bandpass, for the doppler recovery tap.  Would require soldering a coax into the radio itself for this tap instead of using the speaker-out.

-- 
Curt, WE7U.        http://www.eskimo.com/~archer
Babysitting your tracker:  http://info.aprs.net/index.php?title=ControlOperator

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