Steve
Thanks for that. You're quite right it's not acting like a pure
inductor.
I think the inter-winding capacitance of the shorted turns, of parts of
the 15-80m coil and the 160m coil, with a short across them, are acting
as a parallel trap at the harmonic frequencies.
73, Mark, G4AXX
-----Original Message-----
From: Steve Thompson [mailto:g8gsq@ic24.net]
Sent: 22 July 2005 15:35
To: Mark Marsden
Cc: amps@contesting.com
Subject: Re: [Amps] Shorted turns reduce harmonics?
> It seems that the shorted turns are absorbing harmonic energy. Has
> anyone seen this effect before?
It might be interesting to measure the actual impedance presented by the
coil/switch assembly at the harmonic frequencies. Maybe it's not
behaving like a simple inductor.
Steve
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