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

Makes sense to me. As I believe this to be an off-center fed full wave vertical with the bottom 1/4 OR SO inverted (folded up) to capture it's next 1/4w up and to radiate a bit itself, though the cone top would be a voltage not a current node, it should show a little additional radiation.
I doubt your 30 mile test as that's well over the horizon and well past the point to be seeing 'ground wave'. I suspect D layer reflection showing the opposite. Seems shortening the cone should move the upper 1/2w toward a 5/8 radiator lowering the TOA, unless you're also moving the feed point of the Gamma.
Have you used near-field measurement to test for lower TOA when lengthening the cone?

[QUOTE="Needle Bender, post: 516072, member: 13339"] Makes sense to me. As I believe this to be an off-center fed full wave vertical with the bottom 1/4 OR SO inverted (folded up) to capture it's next 1/4w up and to radiate a bit itself, though the cone top would be a voltage not a current node, it should show a little additional radiation. I doubt your 30 mile test as that's well over the horizon and well past the point to be seeing 'ground wave'. I suspect D layer reflection showing the opposite. Seems[B] shortening[/B] the cone should move the upper 1/2w toward a 5/8 radiator lowering the TOA, unless you're also moving the feed point of the Gamma. Have you used [B]near-field [/B]measurement to test for lower TOA when lengthening the cone? [/QUOTE]

Top Bottom