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'.
???????
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?
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?
>>
>> 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??
>>
>> 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.
>>
>> 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.
No more questions.
73,
Jon
KE9NA
-------------------------------------
Jon Ogden
KE9NA
Member: ARRL, AMSAT, DXCC, NRA
http://www.qsl.net/ke9na
"A life lived in fear is a life half lived."
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|