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Re: [Amps] 50 Ohm Loads

To: "Amps@contesting.com" <Amps@contesting.com>
Subject: Re: [Amps] 50 Ohm Loads
From: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 11 Nov 2007 23:24:02 -0800
List-post: <mailto:amps@contesting.com>
On Sun, 11 Nov 2007 14:27:36 -0500, jeremy-ca wrote:

>For low frequencies a regular wire wound can be used with a capacitor to 
>cancel the inductive reactance.

At a single frequency (or depending on the Q, a relatively narrow range). 
The laws of physics, as described by the classic resonant frequency 
curves, apply in full. Wire wound resistors as an RF dummy load are a 
really bad idea. 

Those of you saying you have 55.xx ohm loads. How did you measure them? 
With an ohmeter?  What counts is the Z at RF, not at DC. Only in 
Wonderland do resistors have a constant value from DC to daylight. 

73,

Jim K9YC







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