[TowerTalk] NEC rotate wire

[jimlux]

On 7/13/19 12:13 AM, PY1NB - Felipe Ceglia wrote:
> 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.

You can also just build the horizontal wire at the right Z height, and 
do the rotation with a GM.

For what it's worth, I tend to use multiple GM cards to do moves, in 
theory you can do the translations and rotations all in one shot, but in 
practice, I wind up needing to change something.



> 
> 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 at 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 at 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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