Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old March 30th 10, 09:20 AM
Junior Member
 
First recorded activity by RadioBanter: Mar 2010
Posts: 2
Default 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

Last edited by nico : March 30th 10 at 09:24 AM
  #2   Report Post  
Old March 30th 10, 06:08 PM posted to rec.radio.amateur.antenna
external usenet poster
 
First recorded activity by RadioBanter: Jul 2006
Posts: 2,951
Default 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
  #3   Report Post  
Old March 31st 10, 09:20 PM posted to rec.radio.amateur.antenna
external usenet poster
 
First recorded activity by RadioBanter: Jul 2006
Posts: 112
Default 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
  #4   Report Post  
Old April 1st 10, 08:33 PM posted to rec.radio.amateur.antenna
external usenet poster
 
First recorded activity by RadioBanter: Jul 2006
Posts: 112
Default 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
  #5   Report Post  
Old April 7th 10, 02:04 PM
Junior Member
 
First recorded activity by RadioBanter: Mar 2010
Posts: 2
Default

thank you for your reply

Nicolas Sarthe
ESECO Systems


  #6   Report Post  
Old April 7th 10, 05:13 PM posted to rec.radio.amateur.antenna
external usenet poster
 
First recorded activity by RadioBanter: Oct 2009
Posts: 9
Default 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


  #7   Report Post  
Old October 7th 16, 02:06 PM posted to rec.radio.amateur.antenna
external usenet poster
 
First recorded activity by RadioBanter: Oct 2016
Posts: 1
Default 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
Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Modelling Antenna Factor of small loop Owen Duffy Antenna 8 October 13th 06 03:27 AM
Antenna Modelling - State of the art ? [email protected] Antenna 1 July 2nd 05 05:00 AM
Antenna Modelling software. Svein Henriksen Antenna 1 March 9th 05 02:29 AM
4NEC2 and ARRL Antenna Modelling Course Thomas Antenna 2 September 28th 04 03:44 PM
NEC4 & MF antenna modelling with earth Maurizio Antenna 12 February 4th 04 09:56 PM


All times are GMT +1. The time now is 11:03 AM.

Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017