Received-SPF: neutral (gmail.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org)
From: "Mike Dennison" <mike.dennison@ntlworld.com>
To: rsgb_lf_group@blacksheep.org
Date: Sun, 09 Jul 2006 08:43:16 +0100
MIME-Version: 1.0
Message-ID: <44B0C1A4.20187.4A6832A@localhost>
In-reply-to: <000401c6a21e$4c168260$0300a8c0@lark>
Content-description: Mail message body
Subject: Re: LF: Re: Antenna Tuning
Content-type: text/plain; charset=US-ASCII
Content-transfer-encoding: 7BIT
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Status: O

Certainly, basic tuning can be done with simple coil taps, but once 
that is done a transformer can be useful despite losses. This is 
because it separates matching from tuning, which can interact when 
using taps.

For setting up any new station, an essential item is a loading coil 
with very many taps so that it can be easily varied from several 
microhenries to several millihenries. This is far easier to engineer 
than a variometer. The multi-tap coil can later be replaced with a 
fixed inductor and variometer.

Mike, G3XDV
==========


> . . . . . . . .. ............. The matching and tapping, or transformer,
> if really necessary, can then come later. I am afraid I look at extra
> components like transformers as sources of extra loss. They shouldnt
> be necessary and you ought to be able to do it with a tap or a link
> coil on the loading coil. .
> 
> Cheers de Alan G3NYK
> 
> ----- Original Message -----
> From: Scott Tilley <sthed475@telus.net>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: 08 July 2006 00:08
> Subject: Re: LF: Re: Antenna Tuning
> 
> 
> > J.
> >
> > Some pictures of the situation there would be of great assistance to
> > all of us and may help in troubleshooting this great mystery!
> >
> > Beg, borrow or steal a digi camera!
> >
> > Scott
> >
> >
> >
> > >
> >
> 
>