>
>
>> >
>> >Rich has his own definition of "resonant".
>> >
>> ? When XL = XC, a series or a parallel circuit is resonant. For series
>> circuits at resonance, R is virtually zero. For parallel circuits, R is
>> virtually infinite at resonance.
>>
>
>Yes, agreed. But the loaded L-network is neither a true series nor true
>parallel network. The impedance ratio of the resonant L network (Xc=Xl)
>will not be infinite because there is a resistive load across the shunt
>element. In this case, the currents through two reactive elements can't be
>equal and the resulting voltages drops will not be in antiphase as in
>the classic series resonant tank.
>
>Just to give you the benefit of the doubt, I plugged some real numbers
>into my circuit simulator (Ansoft Serenade SV). With 10uH series L and 100pF
>shunt C and a 2000 ohm termination across the shunt C, I get an input
>impedance
>of 50 + j 8 ohms at the resonant frequency (5.03 MHz). At this frequency
>Xl = 316 and Xc = 316 ohms. This is hardly a dead short. Of course, when I
>place an open circuit across the shunt C, the network becomes a classic
>series tank and the input impedance at 5.03 MHz drops to 0 ohms.
>
thanks, Mike
>
>
>
>--
>FAQ on WWW: http://www.contesting.com/FAQ/amps
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>Problems: owner-amps@contesting.com
>
>
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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