modelling colinear antenna for 4nec2
 

Hello.. I am interested in modeling with 4nec2 a collinear antenna for
869 MHz frequencies, it's use for my security systems.
i wright this code in 4nec2 but i don't see the far field

GW 1 1 0 0.025 0.919 0 0.025 1 1.e-3
GW 2 1 0 0.025 1 0 0.035 1 1.e-3
GW 3 1 0 0.035 1 0 0.035 1.13 1.e-3
GW 4 1 0 0.035 1.13 0 0.025002 1.13009996 1.e-3
GW 5 1 0 0.025002 1.13009996 0 0.025 1.26 1.e-3
GW 7 1 0 0.035 1.26 0 0.035 1.3899 1.e-3
GW 8 1 0 0.035 1.39 0 0.025 1.39 1.e-3
GW 9 1 0 0.025 1.39 0 0.025 1.476 1.e-3
GE 0
EK
EX 0 4 1 0 1 0
GN 2 0 0 0 20 0.0303
FR 0 1 0 0 869 0


Thanks in advance for comments

sorry for my English I'm a French student

modelling colinear antenna for 4nec2
 

On Tue, 30 Mar 2010 09:20:27 +0100, nico
wrote:

i wright this code in 4nec2 but i don't see the far field

Hi Nico,

Seeing the far field is a function of using 4nec2, not in describing
the wires (writing the code). This means there is a control button
you must activate to generate a view of the far field.

Perhaps someone who has experience with this package can help you with
that specific point.

73's
Richard Clark, KB7QHC

modelling colinear antenna for 4nec2
 

In message , nico writes

Hello.. I am interested in modeling with 4nec2 a collinear antenna for
869 MHz frequencies, it's use for my security systems.
i wright this code in 4nec2 but i don't see the far field

GW 1 1 0 0.025 0.919 0 0.025 1 1.e-3
GW 2 1 0 0.025 1 0 0.035 1 1.e-3
GW 3 1 0 0.035 1 0 0.035 1.13 1.e-3
GW 4 1 0 0.035 1.13 0 0.025002 1.13009996 1.e-3
GW 5 1 0 0.025002 1.13009996 0 0.025 1.26 1.e-3
GW 7 1 0 0.035 1.26 0 0.035 1.3899 1.e-3
GW 8 1 0 0.035 1.39 0 0.025 1.39 1.e-3
GW 9 1 0 0.025 1.39 0 0.025 1.476 1.e-3
GE 0
EK
EX 0 4 1 0 1 0
GN 2 0 0 0 20 0.0303
FR 0 1 0 0 869 0


Thanks in advance for comments

sorry for my English I'm a French student



I got a warning

COLINEAR.NEC wavelength=0.345 mtr.

Warn.: volumes for Wires 6 (tag 6) and 7 (tag 7) are intersecting.

it was picking up a frequency of 1 millihertz as well maybe the diameter was being picked up as a
scale factor

However this ran ( slowly) - I chose auto segmentation

GW 1 1 0 0.025 0.919 0 0.025 1 1.e-3
GW 2 1 0 0.025 1 0 0.035 1 1.e-3
GW 3 1 0 0.035 1 0 0.035 1.13 1.e-3
GW 4 1 0 0.035 1.13 0 0.025 1.13 1.e-3
GW 5 1 0 0.025 1.13 0 0.025 1.26 1.e-3
GW 6 1 0 0.035 1.26 0 0.035 1.3899 1.e-3
GW 7 1 0 0.035 1.39 0 0.025 1.39 1.e-3
GW 8 1 0 0.025 1.39 0 0.025 1.476 1.e-3
GE 0
EK
EX 0 4 1 0 1 0
GN 2 0 0 0 20 0.0303
FR 0 1 0 0 869 0

chose far field plot 5 degree or 1 degree steps - full pattern.

The pattern looked sensible. Gain of about 4.6dB at 55 degrees from horizontal.

Warning was still there.

Brian GM4DIJ

--
Brian Howie

modelling colinear antenna for 4nec2
 

In message , nico writes

Hello.. I am interested in modeling with 4nec2 a collinear antenna for
869 MHz frequencies, it's use for my security systems.
i wright this code in 4nec2 but i don't see the far field

GW 1 1 0 0.025 0.919 0 0.025 1 1.e-3
GW 2 1 0 0.025 1 0 0.035 1 1.e-3
GW 3 1 0 0.035 1 0 0.035 1.13 1.e-3
GW 4 1 0 0.035 1.13 0 0.025002 1.13009996 1.e-3
GW 5 1 0 0.025002 1.13009996 0 0.025 1.26 1.e-3
GW 7 1 0 0.035 1.26 0 0.035 1.3899 1.e-3
GW 8 1 0 0.035 1.39 0 0.025 1.39 1.e-3
GW 9 1 0 0.025 1.39 0 0.025 1.476 1.e-3
GE 0
EK
EX 0 4 1 0 1 0
GN 2 0 0 0 20 0.0303
FR 0 1 0 0 869 0



This works OK -I'd more time - you missed a wire too

GW 1 1 0 0.025 0.919 0 0.025 1 1.e-3
GW 2 1 0 0.025 1 0 0.035 1 1.e-3
GW 3 1 0 0.035 1 0 0.035 1.13 1.e-3
GW 4 1 0 0.035 1.13 0 0.025 1.13 1.e-3
GW 5 1 0 0.025 1.13 0 0.025 1.26 1.e-3
GW 6 1 0 0.035 1.26 0 0.025 1.26 1.e-3
GW 7 1 0 0.035 1.26 0 0.035 1.39 1.e-3
GW 8 1 0 0.035 1.39 0 0.025 1.39 1.e-3
GW 9 1 0 0.025 1.39 0 0.025 1.476 1.e-3
GE 0
EK
EX 0 4 1 0 1 0
GN 2 0 0 0 20 0.0303
FR 0 1 0 0 869 0

Brian
--
Brian Howie

thank you for your reply

Nicolas Sarthe
ESECO Systems

modelling colinear antenna for 4nec2
 

"nico" wrote in message
...

Hello.. I am interested in modeling with 4nec2 a collinear antenna for
869 MHz frequencies, it's use for my security systems.
i wright this code in 4nec2 but i don't see the far field

GW 1 1 0 0.025 0.919 0 0.025 1 1.e-3
GW 2 1 0 0.025 1 0 0.035 1 1.e-3
GW 3 1 0 0.035 1 0 0.035 1.13 1.e-3
GW 4 1 0 0.035 1.13 0 0.025002 1.13009996 1.e-3
GW 5 1 0 0.025002 1.13009996 0 0.025 1.26 1.e-3
GW 7 1 0 0.035 1.26 0 0.035 1.3899 1.e-3
GW 8 1 0 0.035 1.39 0 0.025 1.39 1.e-3
GW 9 1 0 0.025 1.39 0 0.025 1.476 1.e-3
GE 0
EK
EX 0 4 1 0 1 0
GN 2 0 0 0 20 0.0303
FR 0 1 0 0 869 0


Hi Nico,

You are missing a "Tag" 6, which should connect tags 5 and 7.
On a quick check; tags: 2, 4, "6", and 8 are 10mm long. As close
as possible; all other tags should be segmented in 10mm lengths --
for example tag 1 is 81 mm long and should be segmented as:
GW 1 8 0 0.025 0.919 0 0.025 1 1.e-3.

Your "GE" card shows "no groundplane. It should be changed to:

GE 1 0 0

indicating a ground plane is specified.

If you wish to show the far field you must include and "RP" card;
for example:

RP 0 181 1 1000 -90 90 1.00000 1.00000

Which shows Theta from -90 to 90 degrees at phi = 90 degrees

You should also show an "EN" card at the end of your code to
indicate program end.

Regards,

Frank

modelling colinear antenna for 4nec2
 

Use this instead of above hope it will help i tried and its working fine. far field is omni directional.

CM
CE
GW 1 1 0 0.025 0.919 0 0.025 1 1.e-3
GW 2 1 0 0.025 1 0 0.035 1 1.e-3
GW 3 1 0 0.035 1 0 0.035 1.13 1.e-3
GW 4 1 0 0.035 1.13 0 0.025002 1.13009996 1.e-3
GW 5 1 0 0.025002 1.13009996 0 0.025 1.26 1.e-3
GW 7 1 0 0.035 1.26 0 0.035 1.3899 1.e-3
GW 8 1 0 0.035 1.3899 0 0.025 1.39 1.e-3
GW 9 1 0 0.025 1.39 0 0.025 1.476 1.e-3
GW 6 1 0 0.025 1.26 0 0.035 1.26 1.e-3
GE -1
GN 2 0 0 0 20 0.0303
EK
EX 0 4 1 0 1 0
FR 0 0 0 0 869 0
EN