>
>on 3/10/00 8:52 PM, measures at 2@vc.net wrote:
>
>>> Why don't YOU tell me. After all, you have all the AMPS archives.
>>
>> This info is in Will's 1M-word grate parasitics debate archive.
>
>You know the answer. Tell us.
>
>>>
>>> Well, gee, Rich.
>>
>> If you bring Jesus Christ into this thread, I'm outta here, Jon. No
>> foolin'.
>
>???????
>
''gee'' is an alteration of Jesus.
>I'm a person of faith. But my faith and ham radio amplifiers have nothing
>to do with each other. So why would I bring it into this thread?
>
I have no idea.
>What's ur point?
>
>
>>> Therefore, VHF energy will never reach the
>>> bandswitch. We've pointed this out to you before, but you always bring up
>>> the resonance in the cap.
>>
>> True. The Tune-C only acts as a Z-step up transformer when it is
>> slightly off resonance. In the great debate archive, there is an example
>> that illustrates what seems to be taking place across open contacts in
>> bandswitches during a parasitic event. If you are interested, I can
>> describe how to find it.
>
>Why not tell us the example itself if you know it?
>>>
As I recall, a -1.0-ohm Xc is placed in series with a +1.0001-ohm Xl.
This is connected across a 120v rms source. what is the current? What
is the peak potential across the capacitor?
>>> So, at resonance, the cap would look like something other than a low
>>> impedance to any energy at the frequency of resonance. However, at any
>>> other frequency, it still looks like it's low impedance.
>>
>> With one L network, Z can be stepped up >10,000 times. An L network is
>> never ever resonant.
>
>What's the L network? The plate choke and tune C??
>
the internal inductance and capacitance of the tune C.
>>>
>>> Therefore, in order for the VHF energy to make it to the bandswitch, the
cap
>>> has to be resonant at the anode resonant frequency.
>>
>> no The cap must be resonant either slightly above or slightly below the
>> anode res. freq.
>
>OK.
>
>>
>>> And I believe that
>>> would be a parallel resonance no a series resonance (I forget).
>>
>> a nearby series.resonance would fill the bill.
>
>I'd agree that nearby would still allow some energy to get to the
>bandswitch.
>
ok
>>>
>>> So if the resonant frequency of the cap is different than the resonant
>>> frequency of the anode, how does the VHF energy make it to the bandswitch?
>>
>> When the Tune-C resonance is nearby it acts like a Z step-up L-network.
>> Dead on the resonance, the Tune-C is a virtual short and the parasitic is
>> a dead duck. .
>
>You've explained yourself well. Thank you.
>
ur welcome, Jon. tnx
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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