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Re: [Amps] Checking Plate Choke resonance

Subject: Re: [Amps] Checking Plate Choke resonance
From: Larry Benko <>
Date: Tue, 13 Oct 2009 23:03:47 -0600
List-post: <">>

I would not call this circuit "very lightly loaded" with an effective 
1000 ohms across the circuit.  The impedance of 100uH @ 9MHz (which was 
used in my example) is +j5655.  I would be glad to build the circuit but 
my 5000V signal generator seems to be misplaced at the moment. :)

I am quite confident that LTSpice and other PSpice programs if used 
properly do simulations properly.  I am not an LTSpice expert but am a 
reasonably competent user.

73, Larry, W0QE

Bill, W6WRT wrote:
> On Tue, 13 Oct 2009 21:45:05 -0600, Larry Benko <> wrote:
>> If someone can show me a fault in my circuit that 
>> materially affects the results I will re-simulate it. 
> How does LT Spice account for the "Tesla Coil" effect in a parallel LC network
> which is very lightly loaded? 
> I am not an expert with LT Spice, but from your description of what you did, 
> LT
> Spice applies a known, controlled voltage to the components and calculates the
> result. Tha'ts fine as far as it goes, but when a lightly loaded LC circuit 
> has
> energy induced into it, the voltages and currents rise far beyond what one
> thinks should be present due to the "flywheel effect", and LT Spice apparently
> does not take that into account. 
> As others have pointed out, one real test is worth a thousand computer
> simulations. 
> 73, Bill W6WRT
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