Steve,
Do you know if the plots were obtained with the roller inductor placed away
from surrounding objects -- or placed within a metal cabinet? The Q looks
pretty pathetic above 40m.
Also, anyone know if Q improves toward 10m when using a roller inductor with
a non-linear turns count that allows for more turns per unit of inductance
at one end? (e.g., Cardwell 229 series)
http://www.cardwellcondenser.com/PAGES/md04g.html
Paul, W9AC
----- Original Message -----
From: "Steve Hunt" <steve@karinya.net>
To: <TowerTalk@contesting.com>
Sent: Monday, November 29, 2010 11:49 AM
Subject: Re: [TowerTalk] Tuners
> That's a useful tuner simulation; but **DO** remember it assumes a
> constant Q for the inductor. Here's how a real roller inductor Q
> measures at different inductance settings on different bands:
>
> http://www.karinya.net/g3txq/temp/rollercoaster_q.png
>
> If you want to get meaningful loss results with that simulator, be
> prepared to manually change the default Q value as you change bands and
> change inductance values.
>
> 73,
> Steve G3TXQ
>
> On 28/11/2010 03:06, Jim W7RY wrote:
>> Now this is cool!
>>
>> http://fermi.la.asu.edu/w9cf/tuner/tuner.html
>>
>> 73
>> Jim W7RY
>>
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