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[AMPS] Finding the Q of a Coil

To: <amps@contesting.com>
Subject: [AMPS] Finding the Q of a Coil
From: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK)
Date: Sun, 7 Oct 2001 08:32:56 +0100
Bill Smith wrote:
>
>Hung up trying to calculate the Q of a coil I want to
>build.  It will be 2 inches in diameter with 26 turns
>of #10 wire.  The length is 5.3 inches.  4.9 Turns per
>inch.  HAMCALC computes this at 11uh of inductance.
>
>
>If I got it right
>Inductive Reactance of this coil on 10 meters=
>2*3.14*29000000*.000011 or 2003 ohms
>
>Q of this coil should be the Inductive Reactance
>divided by the internal resistance of the coil's wire
>(factoring in the RF).  This is where I got bogged
>down.  Couldn't come up with an appropiate number.

VE3ERP (Mr HAMCALC) has produced a new version that does just what you
need. The theory is described the current QEX (Sept/Oct). The download
address is www.arrl.org/qexfiles/ and the file is Murphy0901.zip

Need to pick that up myself, too...

73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
                           http://www.ifwtech.com/g3sek

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