Message-ID: <8D71B823F4C0488997352509FB7D89BD@gnat>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <570A7631.5050001@lineone.net> <DC91D7EF611642ADA1E361BF55CFCFC8@gnat> <570B6F37.8060402@lineone.net> <2025D63622D3474489049C563BA6B7AB@gnat> <570BD148.6020103@lineone.net> <CAMFjj71mz43WMxbTrUgUf3rvoHPCL9CVhWF5wxJisGw0Re5Nag@mail.gmail.com> <570C11FC.6090205@abelian.org>
Date: Mon, 11 Apr 2016 23:07:00 +0100
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Subject: Re: LF: Re: Screening an LF Loading Coil
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Hi Paul I came across Gerald in the 90s when I was part of a 2-way radio 
company, my oppo knew Gerald quite well from the FCS. He was a nice guy. One 
of my local LFers worked for him as well. I have one of his Guiness barrell 
cavities in my workshop. They are very good. The story was he insisted on 
silver-plated Guiness kegs as they were the best quality material and 
casting.

Alan
G3NYK


----- Original Message ----- 
From: "Paul Nicholson" <vlf0403@abelian.org>
To: <rsgb_lf_group@blacksheep.org>
Sent: Monday, April 11, 2016 10:07 PM
Subject: Re: LF: Re: Screening an LF Loading Coil


>
> Takes me back to the 1970's when I was a student working for
> Gerald David at Aerial Facilities in Chesham building these
> things -
>
>  http://www.ingenia.org.uk/Ingenia/Articles/240
>
> which worked incredibly well thanks to the ingenuity of some
> people at Bradford Uni who designed the adjustable center
> conductor of the cavity so that the overall temperature
> coefficient of the 'barrel' as we called the cavities, was close
> to zero.   Bandwidths of a few kHz at VHF with insertion loss
> of less than 1dB were normal.
>
> Gerald was a wonderful larger than life character, I could
> relate many stories about life at AFL in those days - not
> least Gerald's specialised driving techniques applied to the
> country lanes of Buckinghamshire.  There were many jokes about
> ensuring the barrels were empty and Friday lunchtimes at the
> pub were generally devoted to that.
>
> --
> Paul Nicholson
> --
>