VK3XL wrote:

Hi all, I am currently building a new 2 meter beam for SSB. I am using
the DL6WU design on a 6 meter boom. While working on the antenna last
night a thought struck me "why not interlace a 70 cm beam on the same
boom"?
so here is the question, does any one have any data on interaced beams
in particular the degredation of performance of the equivelent monoband
yagis.
There are a number of reasons that this interlaced beam idea is
appealing to me (mostly mechanical) but I am not sure how badly the
gain may be effected. Does anyone have real data on the issue?
many thanks
Mike
VK3XL



First, I would suggest you skip the DL6WU design. While it is good, the
K1FO design has much better charactistics overall, better gain, better
noise temperature, better pattern, better bandwidth.

And the answer, from a long series of 2m/70cm band interlaced
optimizatations I did 15 years ago is, don't bother.

That being said, there is another way to do the dual band that does
work. If you'd like to know, drop me an email, and I'll sewe if the guy
who thought it up agrees to let me tell you. I did a bunch of modeling
for him on the idea last year, and it should work.

To tantalize, it let you put 6, 2 and 432 on one boom. And they all
work well with good bandwidth and pattern.

Any NLRS members reading (there's at least one) who were at Aurora 2005
know who came up with this neat idea.

tom
K0TAR