[AMPS] Finding the Q of a Coil

Phil (VA3UX) phil@vaxxine.com
Sun, 07 Oct 2001 08:50:48 -0400

At 08:43 PM 10/6/2001 -0700, Bill Smith wrote:

>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.
>Where am I going wrong?

Accurate calculation of RF resistance definitely is the tough part.  There 
is more than one set of formulas from different sources for calculating 
this and the results don't agree. If I were forced to choose, I'd probably 
stick with the formulae in Terman's books.   Steve T. correctly outlined 
the general procedure.  I too will have a look at the Murphy file that Ian 


>Bill Smith KO4NR
>FAQ on WWW:               http://www.contesting.com/FAQ/amps
>Submissions:              amps@contesting.com
>Administrative requests:  amps-REQUEST@contesting.com
>Problems:                 owner-amps@contesting.com

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