[UK-CONTEST] GCHQ Antenna

[Don Beattie]

I agree, Bob.

Not only is the forward gain relatively modest (compared with an optimised 
monobander) but the front-to-back on the LPs is decidedly poor.

Some might argue that poor f/b is no bad thing for contest working (work 
them of the back as well) but for a quiet life it's a boon !  (Nino please 
note)

73

Don, G3BJ


----- Original Message ----- 
From: "Bob Henderson" <bob at 5b4agn.net>
To: "'UK-Contest'" <uk-contest at contesting.com>
Sent: Saturday, August 11, 2007 11:18 AM
Subject: Re: [UK-CONTEST] GCHQ Antenna


> 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
>>> _______________________________________________
>>> UK-Contest mailing list
>>> UK-Contest at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/uk-contest
>>>
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>
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