[FoxHunt] TDOA questions.

[Jim Korenz]

  I use a Doppler unit and I find the antenna length/spacing isn't critical. The "standard" setup for 2M, 1/4 wave whips, spaced 0.22 wavelengths, works from the aircraft band, 115Mhz, to the commercial band 162Mhz, with small calibration adjustments.
  JimK  N8PXW

--- On Wed, 8/4/10, Marvin Johnston <marvin at west.net> wrote:

> From: Marvin Johnston <marvin at west.net>
> Subject: Re: [FoxHunt] TDOA questions.
> To: "Radio Direction Finding" <foxhunt at mailman.qth.net>
> Date: Wednesday, August 4, 2010, 11:05 AM
> 
> My first piece of "equipment" was the Handi-Finder, and I
> found both 
> transmitters with it ahead of far more experienced hunters.
> Using it 
> caused others to start using better tools for finding the
> transmitters :).
> 
> One of the problems with a TDOA is that it best works for
> vertical 
> polarization. The other problem is that without
> modification, there is 
> ambiguity in the direction, i.e. it could be either
> straight ahead, or 
> straight in back of the direction the TDOA unit is
> showing.
> 
> ISTR that there is a mod on the HomingIn.com website to
> allow the 
> pattern to be changed to remove that ambiguity.
> 
> > I highly reccomend the book 'Transmitter
> Hunting/RadioDirection
> > Finding Simplified' by Robert Moll. I would say this
> book has the
> > information on just about every aspect of amateur
> radio RDF.
> 
> This is a great book, and one I wore out when I first
> started 
> transmitter hunting :). Slight correction, the authors are
> Joe Moell 
> K0OV and Tom Curlee WB6UZZ.
> 
> Marvin, KE6HTS
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