[Uram-rejections] DF loop inside a metal van - old film

[webstump+uram-bounces at chiark.greenend.org.uk]

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> From webstump at chiark.greenend.org.uk Mon Apr 16 11:47:33 2018
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> From: agree2pay4uce at spam.vlaad.co.uk (Paul Cummins)
> Newsgroups: uk.radio.amateur.moderated
> Subject: Re: DF loop inside a metal van - old film
> Date: Mon, 16 Apr 2018 11:47 +0100 (BST)
> Message-ID: <memo.20180416114730.532I at postmaster.cix.co.uk>
> References: <panv3m$3pi$1 at dont-email.me>
> Reply-To: paulcummins at tiscali.co.uk
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> In article <panv3m$3pi$1 at dont-email.me>, g3vKi at turner-smith.uK (FranK
> Turner-Smith G3VKI) wrote:
> 
> > I vaguely recall somebody in the London area attempting to DF 
> > repeater jammers with a 5/8 mobile whip.
> 
> It's not impossible to do - CB foxhunts used to use all sorts of tricks
> for DF, not least of which was two antennas on each back quater of a car,
> either phased together or not depending on a switch.
> 
> If phased together, they gave a f/b pattern, if not they gave a l/r
> pattern. By having the at the back, the Forward pattern was, in theory,
> stronger.
> 
> Using a power meter on the radio could give you  good idea of general
> direction in 30 secodns or so, so now you move to somewhere else, and try
> again. Ideally a car aprk on a hill, which is why places like Crystal
> Palace an Alexandra Palace were polular start points.
> 
> It's no different in concept to the quad vertical monopole system used
> for police tracker etc.
> 
> -- 
> Paul Cummins - Always a NetHead
> Wasting Bandwidth since 1981
> ====
> Visit North Kent's 2nd biggest supplier of Sour Grapes
> http://www.grapesdirect.co.uk
> 
> 
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