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Message-ID: <3+iXaCAJ1ti+Mw03@telemetry.demon.co.uk>
Date: Wed, 2 Apr 2003 13:53:29 +0100
To: rsgb_lf_group@blacksheep.org
From: "Tom Boucher" <tom@telemetry.demon.co.uk>
In-reply-to: <000f01c2f844$e1abea40$d3e8fc3e@l8p8y6>
MIME-Version: 1.0
Subject: Re: LF: Re: Loading coils
Sender: <owner-rsgb_lf_group@blacksheep.org>
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Reply-To: rsgb_lf_group@blacksheep.org

I note 'KEV wrote the following on 1st April! 
73, Tom G3OLB

<g3kev.ham@virgin.net> writes
>
>Its a question of requirements.
>
>1. These Decca coils were used only on TX and 10/15 db loss was acceptable
>by putting these coils in a metal cage for environmental reasons.
>
>2. Heated coils generate noise, in fact the coils should be kept cold, but
>again in a TX only mode it does not matter.
>
>Because the LF radio amateur also requires the antenna and associated coils
>for receiving , heating the coils produces unnecessary noise and on Transmit
>one cannot afford 10/15 db loss of radiated power.
>For those using RF preamps try running them in a cold environment, in a cold
>box at 0C  and get a superior signal over noise at the RX front end.
>
>The above info is old hat for those in the know, it would appear some have
>led sheltered lives in the wireless world.
>G3KEV