I know the logic i.e. keep metal things (feeder / masts) out of the way of the antenna / elements. In the real world however things can and are often different.
I have a 19 element 70cm Tonna and a 9 element 2m Tonna. They are mounted on a horizontal GRP pole, effectively side by side. The feeder currently runs from the driven element along the boom to the GRP pole where it makes a radiused turn onto the GRP pole, effectivley being in line with the elements before heading downwards at the central mast (see pictures).
I know that ideally the feeder should not cross between the elements and should in my case go vertically, but the question is how much is this going to eaffect the antennas performance? I do have the option of re routing the feeder so it does not travel inbetween the elements such as I hope is shown by my sustandard photshop editing - drop feeder below boom, say 20cm then track back to the GRP pole beyond the elements. Is it worth it? To read more on the subject can you recommend a book / site
Thanks Andy
Attachment:
The attachment 2m feeder route low res.jpg is no longer available
Attachment:
2m feeder route low res.jpg [ 111.25 KiB | Viewed 722 times ]
Attachment:
70cm feeder route low res.jpg [ 123.45 KiB | Viewed 722 times ]