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

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

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

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

"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

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