[UK-CONTEST] GCHQ Antenna

[Bob Henderson]

About 20 years ago my friend Don Widener N4UB, gained access to some huge 
LPAs and set out to compare them against monoband yagis and tribanders 
within the amateur allocation.  He was disappointed to find the LPAs were 
rather poor performers, despite their impressive looks.

I didn't find his conclusions surprising.  LPAs are very much compromise 
antennas.  If access to the complete spectrum from 10 - 30 MHz or greater is 
needed on an uninterupted basis, then an LPA will probably do the job with 
acceptable compromise of single frequency performance.  If requirements are 
more tightly focused, as they are for we amateurs, there are more efficient 
options available.

Bob, 5B4AGN


----- Original Message ----- 
From: "Ray - G4FON" <ray at g4fon.co.uk>
To: "'Don Field'" <don.field at gmail.com>; "'UK-Contest'" 
<uk-contest at contesting.com>
Sent: Saturday, August 11, 2007 8:30 AM
Subject: Re: [UK-CONTEST] GCHQ Antenna


> Many years ago the Royal Aircraft Establishment at Farnborough, as it was
> then, ran a radio station which included a large log periodic pointed
> roughly at the US, if I recall correctly. One of the station managers was
> G3XUU, Colin, and he arranged a visit for the Farnborough radio club and
> Laurie, G3AQC, took along an FT101 (shows you how long ago!) to try on the
> LP.
>
> The performance was actually rather disappointing, we were there around 
> dusk
> and really did not work anything of note and signals what signals there 
> were
> were not that strong either.
>
> I am not sure if Bob, G4HZV, is on this reflector, but I believe that he
> still has some involvement with the station.
>
> 73
>
> Ray, G4FON
>
>
> -----Original Message-----
> From: uk-contest-bounces at contesting.com
> [mailto:uk-contest-bounces at contesting.com] On Behalf Of Don Field
> Sent: 10 August 2007 21:11
> To: UK-Contest
> Subject: Re: [UK-CONTEST] GCHQ Antenna
>
> Went round Croughton many years ago with the Northampton Radio Club.
> Fascinating! And it's grown quite a few more LPs and dishes since then.
> Would love to get my hands on one of those LPs for a contest!
>
> Don G3XTT
>
> On 10/08/07, Ian White GM3SEK <gm3sek at ifwtech.co.uk> wrote:
>>
>> Dave wrote:
>> >
>> >"RAF" Croughton on the A43, also still has a lot of HF stuff up
>> >http://www.croughton.af.mil/
>> >
>> That stretch of road badly needs a sign saying DANGER - SLOW RADIO
>> AMATEURS!
>>
>> Typing "croughton" into Google Earth will take you straight there. You
>> can easily see the Y-shaped spreaders for the log-periodics, which
>> have mostly wire elements.
>>
>> Croughton is mainly a satcoms and HF receiving site. The HF
>> transmitting site is 8 miles west at "RAF" Barford St John, where you
>> can see more Y-boom LPDAs and some ones as well.
>>
>> A former CO at Barford was KL7WE, a callsign that Dave RGK will
>> remember.
>>
>>
>>
>> --
>>
>> 73 from Ian GM3SEK
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