Hi folks,
I am using 4nec2. It has a NEC card input format, and I can set variables,
which makes it great try changes on the antenna files.
I ended up finding a quick way to do it:
After setting the vertical wire:
Create a horizontal wire with the specified lenght, at ground level, it's
tip that will be connected to top wire must be coincident to the vertical
wire's bottom end.
Use a GM card to rotate it as desired and move it in z axis to vertical
wire's top end.
I can later paste the NEC cards here if anyone would like to (I am typing
on the phone right now).
Thank you for your replies.
73,
Felipe CT7ANO, PY1NB
On Tue, 9 Jul 2019, 19:12 jimlux, <jimlux@earthlink.net> wrote:
> On 7/9/19 9:58 AM, David Gilbert wrote:
> >
> > Yes, but what he apparently wants to do is set the wire length while
> > horizontal and then rotate the wire to the desired angle, which avoids a
> > manual calculation of the new end point.
> >
> > EZNEC+ has that capability built in to its NEC interface, but apparently
> > Felipe is using a different NEC application.
>
> In 4nec2, you can do a
> SY L = 10 ' length
> SY ANG = 0 ' direction
>
> GW {stuff} L*COS(ANG), L*SIN(ANG),H,Radius
>
>
> But if you're running bare NEC then GM cards are how you'd do it.
>
> I either use 4nec2, or python that builds a NEC deck. More of the latter
> recently.
>
> If you want to know about dielectric losses, effective height, and
> feedpoint Z for short dipoles on the lunar surface, let me know.
>
> Or the pattern when a thin wire antenna is bent by the spacecraft
> rotatational acceleration - use the python to calculate the shape of the
> wire, generate a stack of GW cards, run the model. Who cares if the NEC
> deck is several hundred lines long.
>
> (I think that in some cases, one might be able to use the catenary card
> from NEC4 for this)
>
>
>
>
> >
> > 73,
> > Dave AB7E
> >
> >
> > On 7/9/2019 9:23 AM, Wes Attaway (N5WA) wrote:
> >> It seems like you could just give the far end a new coordinate in the
> >> desired direction and leave the other end connected to the vertical wire
> >> end.
> >>
> >> -------------------
> >> Wes Attaway (N5WA)
> >> (318) 393-3289 - Shreveport, LA
> >> Computer/Cellphone Forensics
> >> AttawayForensics.com
> >> -------------------
> >> -----Original Message-----
> >> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
> >> PY1NB
> >> - Felipe Ceglia
> >> Sent: Tuesday, July 09, 2019 10:29 AM
> >> To: Tower and HF antenna construction topics.
> >> Subject: [TowerTalk] NEC rotate wire
> >>
> >> Hello,
> >>
> >> When modeling an inverted L (tag 1 is the vertical part, tag 2 is the
> >> horizontal), is there a quick way or trick to rotate the horizontal wire
> >> (tag 2) and keep it connected to the vertical wire (tag 1)?
> >>
> >> When I try to rotate it using the move/copy (GM) it gets away from the
> >> vertical wire.
> >>
> >> Thanks,
> >>
> >> Felipe CT7ANO, PY1NB
> >
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> >
> >
> >
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