[FoxHunt] PicoPlot DF

[bruce]

Build a tuned DF loop. Look up DF loops on Google. A single turn of wire and
a capacitor will do at 27MHz.
A simple loop is bi-directional; you can resolve the ambiguity by taking
bearings from multiple locations.
It is also possible to make the loop uni-directional with a sense antenna,
but I suggest you only do this if Plan A doesn't work; it's tricky to setup
at 28/27MHz.

> -----Original Message-----
> From: foxhunt-bounces at mailman.qth.net 
> [mailto:foxhunt-bounces at mailman.qth.net] On Behalf Of KD7JYK
> Sent: Wednesday, 18 July 2007 1:52 PM
> To: Ray Brown; Radio Direction Finding
> Subject: Re: [FoxHunt] PicoPlot DF
> 
> I can get within a 400'-500' circle, but can't see the 
> source.  I can hear it from 15 miles away, that's what got my 
> attention, so it must be a fairly large antenna at the 
> source, I am guessing a 1/4 wave and most likely mounted 
> outside.  I am using a 24" whip and up to 131dB attenuation 
> and can get very close by spiraling in on the signal, but can 
> only get so close, within a few pieces of property and at 
> times I can hear the signal on one side of a street or only 
> in front of one building, and cannot see any antennas at any 
> of the three sites.  I have talked to many people that own 
> property and buildings from where the signal appears to 
> originate, without luck.  I almost need some sort of sniffer, 
> something small and hand-held like a Geiger-counter, but that 
> would also require being able to sniff around the land and 
> buildings, something I don't think people would go for.
> 
> Kurt
> 
> ----- Original Message -----
> From: "Ray Brown" <kb0stn at sbcglobal.net>
> 
> >   If you're only within 15 miles, then you're going to need 
> something
> else.
> > You might try one of the Doppler setups that was originally 
> designed 
> > for
> 2m use,
> > but at 11m they should be picking up a trace of the signal, 
> hopefully
> still
> > enough for the Doppler to work...
> 
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