help editing 4nec2 model ?
 

All,

I am experimenting with 4nec2 and these are an elementary questions. I have been
able to create a 'new' model, see below, using the geometry editor. Here are few
questions:

1. when the model loads it shows 4 MHz instead of 144.

2. ground has been set but does not show in the display

3. I am trying to make the middle segment a coil. How is a coil created? When
inserting a helix 4nec2 errors with a divide by zero error? The steps would be
helpful.

4. Adding a source does not seem to take. I am not sure how how to add a source?
How to determine where it is placed?

These are basic, but any help would be appreciated.

Thanks - Dan

CE
GW 1 3 0.05 0 2.2204e-16 0.05 0 0.1
1.29409e-3
GW 2 3 0.05 0 0.225 0.05 0 0.125 1.29409e-3
GW 3 1 0.05 0 0.125 0.05 0 0.1 1.29409e-3
GE 1
EK
GN 2 0 0 0 13 6.e-3
FR 0 1 0 0 144 0
EN

help editing 4nec2 model ?
 

One comment Dan, you have defined a finite Sommerfeld/Norton ground. In
NEC2 the antenna cannot touch the ground unless it is perfect (Unlike EZnec,
with its "Minninec" ground). 2.2204e-16 is, from NEC's point of view, zero.
At the moment I don't know how to address the other problems, but may play
with it later. I have also noticed the problem with the frequencies.

There are instructions provided with the program, but are buried as "Word",
and text, documents in the 4Nec2 folder,and in the sub-folder "exe". The
NEC user manual is also useful, but will only help with NEC code structure.

Frank


"dansawyeror" wrote in message
...
All,

I am experimenting with 4nec2 and these are an elementary questions. I
have been able to create a 'new' model, see below, using the geometry
editor. Here are few questions:

1. when the model loads it shows 4 MHz instead of 144.

2. ground has been set but does not show in the display

3. I am trying to make the middle segment a coil. How is a coil created?
When inserting a helix 4nec2 errors with a divide by zero error? The steps
would be helpful.

4. Adding a source does not seem to take. I am not sure how how to add a
source? How to determine where it is placed?

These are basic, but any help would be appreciated.

Thanks - Dan

CE
GW 1 3 0.05 0 2.2204e-16 0.05 0
0.1 1.29409e-3
GW 2 3 0.05 0 0.225 0.05 0 0.125
1.29409e-3
GW 3 1 0.05 0 0.125 0.05 0 0.1
1.29409e-3
GE 1
EK
GN 2 0 0 0 13 6.e-3
FR 0 1 0 0 144 0
EN

help editing 4nec2 model ?
 

Frank,

I have made some progress. The trick for adding new source and RLC objects is to
select them and then to click, hold, and drag to position. The value option box
opens up for setting.

The current model does not sweep frequencies. Have you figured out how to sweep
frequencies?

So far these are normal teething problems for a new app. Thanks - Dan

Frank wrote:
One comment Dan, you have defined a finite Sommerfeld/Norton ground. In
NEC2 the antenna cannot touch the ground unless it is perfect (Unlike EZnec,
with its "Minninec" ground). 2.2204e-16 is, from NEC's point of view, zero.
At the moment I don't know how to address the other problems, but may play
with it later. I have also noticed the problem with the frequencies.

There are instructions provided with the program, but are buried as "Word",
and text, documents in the 4Nec2 folder,and in the sub-folder "exe". The
NEC user manual is also useful, but will only help with NEC code structure.

Frank


"dansawyeror" wrote in message
...

All,

I am experimenting with 4nec2 and these are an elementary questions. I
have been able to create a 'new' model, see below, using the geometry
editor. Here are few questions:

1. when the model loads it shows 4 MHz instead of 144.

2. ground has been set but does not show in the display

3. I am trying to make the middle segment a coil. How is a coil created?
When inserting a helix 4nec2 errors with a divide by zero error? The steps
would be helpful.

4. Adding a source does not seem to take. I am not sure how how to add a
source? How to determine where it is placed?

These are basic, but any help would be appreciated.

Thanks - Dan

CE
GW 1 3 0.05 0 2.2204e-16 0.05 0
0.1 1.29409e-3
GW 2 3 0.05 0 0.225 0.05 0 0.125
1.29409e-3
GW 3 1 0.05 0 0.125 0.05 0 0.1
1.29409e-3
GE 1
EK
GN 2 0 0 0 13 6.e-3
FR 0 1 0 0 144 0
EN

help editing 4nec2 model ?
 

Hello Dan,

to sweep frequencies after having modified or created your model, push
F7, select 'use freq-loop', select one of the options 'Gain' (only
Gain, F/B and F/R line-chart); 'Ver' (vertical pattern for eacht freq),
'Hor' (horizontal pattern) or 'Full' and specify the start- en stop-
frequencies. Then click Generate.

B.t.w, did you read the _GettingStarted.txt file ?

Concerning the 144 mhz / helix problem, for now I am not able to
reproduce it overhere. I would very much like to know about this, could
you give me some more details ?

Arie.

help editing 4nec2 model ?
 

"Arie" wrote in message
oups.com...
Hello Dan,

to sweep frequencies after having modified or created your model, push
F7, select 'use freq-loop', select one of the options 'Gain' (only
Gain, F/B and F/R line-chart); 'Ver' (vertical pattern for eacht freq),
'Hor' (horizontal pattern) or 'Full' and specify the start- en stop-
frequencies. Then click Generate.

B.t.w, did you read the _GettingStarted.txt file ?

Concerning the 144 mhz / helix problem, for now I am not able to
reproduce it overhere. I would very much like to know about this, could
you give me some more details ?

Arie.

Arie,

Will the NEC code for such a structure help you?

Frank

help editing 4nec2 model ?
 

Arie,

The nec listing is below. I am unable to 'edit' the coil, element 2.

In 'edit' mode how are the GH and GM cards edited? (The coil is displayed
intermittently.)

Is there something specific about using tags 101 and 102 as opposed to 1 and 2?

Thanks - Dan

CM Loaded 2 m monopole
CE
GW 1 15 0.4 0 5.6 0.4 0 1.6 0.025
GH 2 50 .32 1.6 .4 .4 .4 .4 0.025
GM 100 0 0 0 0 0 0 4 0
GW 3 15 0.4 0 4 0.4 0 0 0.025
GS 0 0 0.025400
GE 1
GN 1
EX 0 3 15 00 1 0
LD 5 101 1 15 5.8001E7
LD 5 102 1 50 5.8001E7
LD 5 3 1 15 5.8001E7
FR 0 41 0 0 135 2
RP 0 181 1 1000 -90 90 1.00000 1.00000



Arie wrote:
Hello Dan,

to sweep frequencies after having modified or created your model, push
F7, select 'use freq-loop', select one of the options 'Gain' (only
Gain, F/B and F/R line-chart); 'Ver' (vertical pattern for eacht freq),
'Hor' (horizontal pattern) or 'Full' and specify the start- en stop-
frequencies. Then click Generate.

B.t.w, did you read the _GettingStarted.txt file ?

Concerning the 144 mhz / helix problem, for now I am not able to
reproduce it overhere. I would very much like to know about this, could
you give me some more details ?

Arie.

help editing 4nec2 model ?
 

Dan, when using the GM card it reassigns the tag numbers, by adding the
number in the first field to those cards it moves. This is to avoid
confusion. The LD cards, or any other cards, if applicable, should then use
the reasigned tag numbers.

Frank


"dansawyeror" wrote in message
...
Arie,

The nec listing is below. I am unable to 'edit' the coil, element 2.

In 'edit' mode how are the GH and GM cards edited? (The coil is displayed
intermittently.)

Is there something specific about using tags 101 and 102 as opposed to 1
and 2?

Thanks - Dan

CM Loaded 2 m monopole
CE
GW 1 15 0.4 0 5.6 0.4 0 1.6 0.025
GH 2 50 .32 1.6 .4 .4 .4 .4 0.025
GM 100 0 0 0 0 0 0 4 0
GW 3 15 0.4 0 4 0.4 0 0 0.025
GS 0 0 0.025400
GE 1
GN 1
EX 0 3 15 00 1 0
LD 5 101 1 15 5.8001E7
LD 5 102 1 50 5.8001E7
LD 5 3 1 15 5.8001E7
FR 0 41 0 0 135 2
RP 0 181 1 1000 -90 90 1.00000 1.00000



Arie wrote:
Hello Dan,

to sweep frequencies after having modified or created your model, push
F7, select 'use freq-loop', select one of the options 'Gain' (only
Gain, F/B and F/R line-chart); 'Ver' (vertical pattern for eacht freq),
'Hor' (horizontal pattern) or 'Full' and specify the start- en stop-
frequencies. Then click Generate.

B.t.w, did you read the _GettingStarted.txt file ?

Concerning the 144 mhz / helix problem, for now I am not able to
reproduce it overhere. I would very much like to know about this, could
you give me some more details ?

Arie.