>
>> >>? the dip you see with a dipmeter coupled to a Pi-network is not on the
>> >> operating frequency.
>> >
>> >Now there's a new definition that's not in any of the
>> >textbooks............not a very scientific one either, if I may so, Rich.
>> >
>> ? Do you believe that a Pi-network is resonant on the working frequency,
>> Peter?
>
>Careful Peter, it's a very special dip meter. It can also measure Q,
>and the anti-resonant frequency of a control grid just by placing it
>near the socket leads.
? I am familar with control grid resonance. For the 3-500Z, this is 80
- 90 MHz. What is anti-resonant frequency of the control grid, Tom?.
>
>According to Rich's magic grid dip meter, a pi-network isn't ever
>resonant.
>
>Phew!!
>
? RL = 2000 ohms. R out equals 50-ohms. Freq = 7.00MHz. Q = 10
Therefore, C1 = 2000 ohms/10 = 200 ohms. From calculation, C1 = 114pF,
C2 = 562pF, L = 5.06uH. Since C1 is effectively in series with C2,
C-net = 94.8pF. The resonant freq. of 5.06uH in parallel with 94.8pF is
7.266MHz.
- cheers, Tom
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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