[FoxHunt] PicoPlot DF

[wolfbob]

Try a small loop. Use the broadside null which can be very 
sharp. A 6 inch diameter should be ok. One is sold by Arrow 
Antennas or you can make one from a hunk of 1/4 inch copper 
tubing and a hank of wire.

Most radios are not shielded well enough to get in close so 
maybe try a simple sniffer made from a diode and a 
voltmeter.

WBob, WB6JPI

----- Original Message ----- 
From: "KD7JYK" <kd7jyk at earthlink.net>
To: "Ray Brown" <kb0stn at sbcglobal.net>; "Radio Direction 
Finding" <foxhunt at mailman.qth.net>
Sent: Tuesday, July 17, 2007 8:52 PM
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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