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
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|