[AMPS] Is screen potential important?

[measures]

>
>snipped for brevity
>
>-----Original Message-----
>From: measures <2@vc.net>
>To: Steve Thompson <rfamps@ic24.net>; AMPS <amps@contesting.com>
>Date: 27 March 2000 14:26
>Subject: Re: [AMPS] Is screen potential important?
>
>>>>The charge on the screen RF-bypass cap. can not go from 0 to 1500 volts
>>>>in one input cycle.
>>>
>>>No, but neither can the rf drive from a SSB exciter go from zero to full
>in
>>>one cycle.
>>
>>This is precisely whan happens.   The first cycle out of the exciter can
>>be anything up to the limit of the Final Unit.
>
>
>Surely not in practice. 

This is what my oscilloscope indicates.  

> There is some rise time in the envelope - during
>that time, the amplitude of the rf cycles gradually increases from zero to
>the intended level. 

The oscilloscope indicates that this is not the case. 

>The envelope risetime is inversely related to the
>modulation bandwidth. 

The risetime is wholly dependant on the operating frequency.  

>When the signal has been through a 2.5kHz wide filter,
>the time is around 100s microseconds.
>
[chortle]

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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