Body
Thanks Hector, for explaining this in simple to understand concept. I
was wondering how long you would hold this one close to the chest.
Along these lines I highly recommend Wesley's new video with the
insulators conducting RF. Just skip to the end to see the effect
https://www.youtube.com/watch?v=KLAPRNWuAn4
On 12/29/2018 7:48 AM, [email protected] [EVGRAY] wrote:
>
>
> Power factor in a sense is a side band FM modulation of the ac power
> carrier frequency ...as power factor shifts the phase angle so also
> the frequency ....
>
> There! i threw the cinder block in the store front window !
>
> that is how the RV virtual phase is created !
>
>
> (H)
>
>
>
>
> ---In [email protected], <onielsen@...> wrote :
>
> Hi Mick,
>
> I didn't know that a spark gap creates FM modulation. But the
> secondary breakdown through the semiconducting crystal behaves like a
> spark gap with its negative resistance characteristic. The modulation
> must depend on the external circuit. The breakdown can be triggered by
> the base or just by reaching the breakdown voltage of the device.
>
> Regards
> Ole
>
>
> ---In [email protected], <mkjekyll@...> wrote :
>
> Ole,
>
> Thanks for the good info.
>
> Do you know if a high speed avalanche transistor creates an FM
> modulation as does a spark gap?
>
> On 12/28/2018 2:16 PM, onielsen@... <mailto:onielsen@...> [EVGRAY] wrote:
>
>>
>>
>> Hi Mick,
>>
>> "Can you explain how and if avalanche currents in certain
>> transistors can
>> mimic multipaction and the electron multiplication of
>> secondary emission?"
>> The second breakdown
>> <https://wiki2.org/en/Second_breakdown#Secondary_breakdown>
>> acts like an avalanche that can't be stopped except by
>> disrupting the current from outside the transistor. The first
>> breakdown is kind of like the Zener effect while the
>> secondary breakdown is a negative resistance characteristic
>> where the transistor shorts.
>>
>> "You mentioned awhile back a concept of power multiplication
>> through
>> avalanche mode rather than resonance as the system could be
>> much less
>> finicky. Could you elaborate on this concept?"
>> The avalanche is like a solid state spark gap and happens
>> very fast like in a few nsec or less.
>> https://wiki2.org/en/Avalanche_transistor
>>
>> Bipolar transistors optimized to be used in avalanche mode:
>> https://www.diodes.com/products/discrete/bipolar-transistors/special-function-transistors/avalanche-transistors/
>> Normal bipolar transistors aren't optimized for avalanche
>> mode operation and their breakdown parameters may vary a lot
>> even having the same type number. They'll still show the
>> breakdown effect.
>>
>> Understanding Power Transistors Breakdown Parameters:
>> https://www.onsemi.com/pub/Collateral/AN1628-D.PDF
>>
>> "It is interesting to note that during multipaction events
>> much of the
>> technology present is designed to limit the amplification
>> event to
>> prevent damage to the devices."
>> If the device melts or explodes it's no longer useful. This
>> is a good reason for limiting the effect. This means the
>> current must be limited or cut off from the outside as the
>> device can't do it after being triggered.
>>
>> Regards
>> Ole
>>
>>
>>
>> --In [email protected] <mailto:[email protected]>,
>> <mkjekyll@...> <mailto:mkjekyll@...> wrote :
>>
>> Ole,
>>
>> Can you explain how and if avalanche currents in certain
>> transistors can
>> mimic multipaction and the electron multiplication of
>> secondary emission?
>>
>> You mentioned awhile back a concept of power multiplication
>> through
>> avalanche mode rather than resonance as the system could be
>> much less
>> finicky. Could you elaborate on this concept?
>>
>> It is interesting to note that during multipaction events
>> much of the
>> technology present is designed to limit the amplification
>> event to
>> prevent damage to the devices.
>>
>> Great data here:
>>
>> https://en.wikipedia.org/wiki/Multipactor_effect
>>
>> More intense version:
>>
>> https://arxiv.org/ftp/arxiv/papers/1112/1112.2176.pdf
>
>