Re: HV protection for receiver input?

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#2224

From: Sam Goldwasser
Date: Wed, 06 Aug 2003 15:36

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kensmith@violet.rahul.net (Ken Smith) writes:

> In article <bgr1dh$2m7$1@news.eusc.inter.net>,
> Jerry G. <jerryg50@hotmail.com> wrote:
> [.... neon lamp ...]
> >In your case you want to use it as a hard voltage clamp.  Put a resistor
> >of about 27 to 33 ohms in series with the lamp, to allow isolation from
> >its capacitive characteristics.  The stray capacitance of the lamp is
> >about 3 to 5 pF.
> 
> I disagree with adding the resistor.  Just find a way to live with the 
> extra 5pF.  The resistor in series with it will cause losses.  The 5pF 
> will cause a mistuning that may either be unimportant or easy to correct 
> for.

Antenna coax is what? 75 pF per foot?  I doubt the 5 pF will make
any detectable difference.

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From: Sam Goldwasser <sam@saul.cis.upenn.edu>
Newsgroups: sci.electronics.design,alt.engineering.electrical,sci.electronics.repair,aus.electronics
Subject: Re: HV protection for receiver input?
Date: 06 Aug 2003 11:36:46 -0400
Organization: University of Pennsylvania
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