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Re: [TowerTalk] Roller inductor sources

To: Patrick W7TMT <w7tmt@dayshaw.net>,'Tom Rauch' <w8ji@contesting.com>, towertalk@contesting.com
Subject: Re: [TowerTalk] Roller inductor sources
From: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Reply-to: g3rzp@g3rzp.wanadoo.co.uk
Date: Wed, 19 Oct 2005 12:45:17 +0200 (CEST)
List-post: <mailto:towertalk@contesting.com>
One problem with the L network (single ended or balanced) is that working Q is 
a function of impedance transformation ratio.

                                                      Q = Ã([Rp/ Rs] â 1)    
                                                                                
       

Every time you double the working Q, you increase the losses by 4. The currents 
and voltages can get high enough to be embarassing, too.

The T match enables Q to be controlled, but in this particular application, 
what's wrong with a parallel (or series if it's low impedance) tuned circuit 
and link coupling? A lot less complex.

73

Peter G3RZP
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