Re: NEC-LIST: This may sound like a real dumb question.....

Good day Callum,

You have it pretty close. You have to think of the segment as opened up
with a gap, and the voltage applied across the gap. I believe the manual
says that the impressed E field is equal to the applied voltage divided by
the segment length. So, both the plus and minus terminals are applied to
the segment. Be careful with the use of the word "ground". In general,
sources in NEC arenot tied to earth ground. If you want to include an earth
ground connecti0on, you have to explicitly model it, along with the
box/building containing the source, the transmission line connection, etc.

Doug Miron
----- Original Message -----
From: "Callum Heinrich" <cheinric_at_atrad.com.au>
To: <nec-list_at_gweep.ca>
Sent: Sunday, January 12, 2003 3:27 PM
Subject: NEC-LIST: This may sound like a real dumb question.....

Good morning all,

I have just started using NEC2 to do some modelling of cross dipole
antennas, and I am trying to change the feed point of the where the
antenna is actually excited along the antenna. What I was concerned
about is when you use the EX card with a first integer at 0 (ie
excitation of a segment via a electric field), where does NEC2 percieve
the ground of this excitation to be? In other words this excitation of
the segment is in reference to where? I surmised that NEC2 treats the
excitation along the segment as much like placing a positive terminal at
the start of one end of the segment and a ground/ negative terminal at
the other end of the segment. Is that the correct way of thinking?

Regards,

Callum Heinrich.

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