You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

Director elements are slightly shorter than the driven element, something on the order of 5% give or take some. Typically, all the directors are the same length. If they are -close- is the biggy, a micrometer isn't necessary to do that measuring. Adding elements to an antenna will result in lowering the input impedance so count on having to re-tune the thing. May not be much, but it will make a difference.
Then you get to think about the diminishing return of additional directors, that's a mechanical thingy to a large extent. The first or second director addition can make a very noticeable difference in 'directivity/gain'. After that there's not a -huge- difference. Whatever amount of effort makes you happy...
- 'Doc

[QUOTE="W5LZ, post: 446302, member: 129"] Director elements are slightly shorter than the driven element, something on the order of 5% give or take some. Typically, all the directors are the same length. If they are -close- is the biggy, a micrometer isn't necessary to do that measuring. Adding elements to an antenna will result in lowering the input impedance so count on having to re-tune the thing. May not be much, but it will make a difference. Then you get to think about the diminishing return of additional directors, that's a mechanical thingy to a large extent. The first or second director addition can make a very noticeable difference in 'directivity/gain'. After that there's not a -huge- difference. Whatever amount of effort makes you happy... - 'Doc [/QUOTE]

Top Bottom