12-09-2016, 05:03 PM
Mike
I used a homebrew multiband trap dipole/V when I was on Norfolk but I wanted something that I could point rather than being omnidirectional. To me a vertical = noise from anywhere and I have spent enough resources setting up this QTH that I didn't want to go down that track. By the same token, I didn't have enough space on either tower to put up yet another yagi just for 18 and 24MHz. The new interspersed trapped elements for 12M and 17M seemed the best that I could come up with.
The 'parallel whip' idea to a common feedpoint does work but the spacing of the two elements is fairly critical and needs to be significant (>300mm) if you want to reduce the interaction. I tried that idea a couple of years ago while experimenting with a 20/15/10 arrangement and ended up abandoning it due to the spacing requirements needed and looking for something physically stable. I still have the basic hardware setup somewhere in the pile of aluminium tubing near the shed
Thanks for the input. Anyone else??
I used a homebrew multiband trap dipole/V when I was on Norfolk but I wanted something that I could point rather than being omnidirectional. To me a vertical = noise from anywhere and I have spent enough resources setting up this QTH that I didn't want to go down that track. By the same token, I didn't have enough space on either tower to put up yet another yagi just for 18 and 24MHz. The new interspersed trapped elements for 12M and 17M seemed the best that I could come up with.
The 'parallel whip' idea to a common feedpoint does work but the spacing of the two elements is fairly critical and needs to be significant (>300mm) if you want to reduce the interaction. I tried that idea a couple of years ago while experimenting with a 20/15/10 arrangement and ended up abandoning it due to the spacing requirements needed and looking for something physically stable. I still have the basic hardware setup somewhere in the pile of aluminium tubing near the shed
Thanks for the input. Anyone else??
Doug VK4ADC @ QG62LG51
http://www.vk4adc.com
This Forum is only going to be as interesting as the posts it contains.
If you have a comment or question, post it as it may trigger or answer the query in someone else's mind.
http://www.vk4adc.com
This Forum is only going to be as interesting as the posts it contains.
If you have a comment or question, post it as it may trigger or answer the query in someone else's mind.