Re: NEC-LIST: Re: RF Voltage Levels

This is probably better expressed as electric field strength,
however, since that more directly correlates to arc-over and
conditions that allow significant corona.

Cheers,
Tom

-----Original Message-----
From: nec-list-bounces+tom_bruhns=agilent.com_at_robomod.net [mailto:nec-list-bounces+tom_bruhns=agilent.com_at_robomod.net] On Behalf Of Duncan Baker
Sent: Friday, December 28, 2007 11:38 AM
To: nec-list_at_robomod.net
Subject: Re: NEC-LIST: Re: RF Voltage Levels

Dear all,

Peter has it quite correct. Many years ago I had a peculiar situation on a somewhat
poorly designed HF log-periodic antenna. With about 10 KW input, it arced across the
insulators in the active region and burnt off the catenary. Investigation by modelling
and a redesign of the LPA solved the problem.

Best regards,
Duncan Baker.

-----Original Message-----
From: nec-list-bounces+duncan.baker=ieee.org_at_robomod.net
[mailto:nec-list-bounces+duncan.baker=ieee.org_at_robomod.net] On Behalf Of P Dettmann
Sent: 28 December 2007 07:49 PM
To: nec-list_at_robomod.net
Subject: NEC-LIST: Re: RF Voltage Levels

For radiation, the voltages are not of interest, but for the
practical consideration of voltage stress on support insulators, or
to avoid corona, it is important to know the level of voltages involved.

Peter Dettmann

>-----------------------------------------------------------
>
>Message: 1
>Date: Wed, 26 Dec 2007 21:29:04 -0500
>From: wadavis_at_vt.edu
>
>First, you need to think about what you mean by voltage on a wire.
>In reality there is no such
>thing except as a voltage with respect to ground and even that
>depends on the path used to
>connect to ground. Why do you want the voltage? For radiation
>computations, only the
>current on the wire is needed.
>
>Bill
>
> > Is there an easy way to extract RF voltage levels at
> > various points in a wire in NEC4?
> >
> > TIA
> >
> > Jeff

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