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I just loaded 4nec2 on by backup installation (something I always keep but sometimes forget I have). It turns out I remembered wrong.

I started with two 1/2 wavelength center fed dipoles in a collinear setup, and I moved them apart 1 foot at a time. Peak gain happened between 17 and 18 feet between them. Factoring in where the current nodes are, that is very close to 1 wavelength current node to current node.

You said you have the dimensions of the antenna? I have some of them from the manual but not all of them, especially that coil, I know it has 9 turns but know nothing else... Also, what frequency is it tuned for with said dimensions?

Here is a chart of the data, the numbers across the bottom are the distance between the two elements in feet, the numbers on the left are gain.

[ATTACH=full]72360[/ATTACH]

The DB

<blockquote data-quote="The DB" data-source="post: 855267" data-attributes="member: 21346">I just loaded 4nec2 on by backup installation (something I always keep but sometimes forget I have).&nbsp; It turns out I remembered wrong.I started with two 1/2 wavelength center fed dipoles in a collinear setup, and I moved them apart 1 foot at a time.&nbsp; Peak gain happened between 17 and 18 feet between them.&nbsp; Factoring in where the current nodes are, that is very close to 1 wavelength current node to current node.You said you have the dimensions of the antenna?&nbsp; I have some of them from the manual but not all of them, especially that coil, I know it has 9 turns but know nothing else...&nbsp; Also, what frequency is it tuned for with said dimensions?Here is a chart of the data, the numbers across the bottom are the distance between the two elements in feet, the numbers on the left are gain.[ATTACH=full]72360[/ATTACH]The DB</blockquote>

[QUOTE="The DB, post: 855267, member: 21346"] I just loaded 4nec2 on by backup installation (something I always keep but sometimes forget I have). It turns out I remembered wrong. I started with two 1/2 wavelength center fed dipoles in a collinear setup, and I moved them apart 1 foot at a time. Peak gain happened between 17 and 18 feet between them. Factoring in where the current nodes are, that is very close to 1 wavelength current node to current node. You said you have the dimensions of the antenna? I have some of them from the manual but not all of them, especially that coil, I know it has 9 turns but know nothing else... Also, what frequency is it tuned for with said dimensions? Here is a chart of the data, the numbers across the bottom are the distance between the two elements in feet, the numbers on the left are gain. [ATTACH type="full" size="406x302"]72360[/ATTACH] The DB [/QUOTE]

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