[Amps] Toroidal Tank Coils

[2]

>----- Original Message -----
>From: "Tom Rauch" <w8ji at contesting.com>
>To: "2" <2 at vc.net>; " AMPS" <amps at contesting.com>
>Sent: Monday, March 03, 2003 10:41 AM
>Subject: Re: [Amps] Toroidal Tank Coils
>
>
>> > Mr. Rauch -- 80% of 4000V = 3200V.  90% of 4000V = 3600V.  What's the
>> > problem with 3500V?.
>>
>> Your normal diversion is to lift things out of context. The rest of my
>> answer explains the difference.
>>
>> > >which would translate to 3kV or more across the tank inductance.
>> > >The exact value depends on tank loaded Q, which sets phase shift across
>> the
>> > >inductance. Q's of 10-12 result in about 130-degree shift,
>> >
>> > And I thought the phase shift in an inductor was 90º.
>>
>> You thought wrong.
>>
>> Phase shift depends on reactance and circuit impedances. A series inductor
>> only causes a 90-degree shift when the load impedance is zero and the
>> inductor is infinite in value.
>>
>> In a pi-network tank system we have shunt capacitive reactances at each
>end,
>> and a series inductance. The ratio of those reactances and the termination
>> impedance of the network determines the phase shift. It is 90-degrees in a
>> minimum Q network that matches two impedances, because the network behaves
>> like a 1/4 wl transmission line with a surge impedance equal to the
>> geometric mean of the load and source impedances. The same formula that
>> would apply to a 1/4 wl transmission line applies to the CLC or LCL
>system.
>>
>> In a pi, that is behaving like a pi, the network is two back-to-back L's