[amsat-bb] Re: Cross boom question

[John Price]

I have been using the same antennas and a metal boom since 1992. Also
do the same at field day every year. If it doesn't work please don't
tell me now. I have been to happy with the setup to wont to change.

73's << John

On Sat, Jul 25, 2009 at 4:47 PM, Kevin Groth<hislens at gmail.com> wrote:
> I have just finished building a set of 2m and 440mhz circular polarized
> beams to work the birds.  (tired of standing in the heat and cold outside!)
> I tried to save a little bit of money by building a wood dowel inserted into
> a sched 40 uv resistant pipe.  I hung the beams on either side of the cross
> boom and it sags way too much and is ugly.  I thought about using some
> eyebolts and some nylon cording for support to the vertical mast, but I'm
> trying to keep everything as clean as possible for the neighbors.  I would
> really rather not have to purchase a fiberglass satellite boom commercially,
> but if I have to, I will.
>
>
>
> I have a bunch of 1.75" aluminum pipe that would be more than able to
> support most anything I plan to add to the antenna collection in the future
> (1.2 and 2.4 ghz).  My question is how much of a difference would it make if
> I mounted the 2m and 440 beams in an X position to the aluminum beam?  I
> have read some short answers that it would minimize the swr issue, but
> haven't really found an answer that I am comfortable with.  Also, how would
> that effect a later addition like a 1.2 or 2.4 ghz antenna.?  My current
> antennas are a KLM 2m-14c and a 435-40cx, both circular polarized and
> switchable RH and LH polarization.  Does anyone have any experience with a
> metal crossboom?
>
>
>
> Thanks!
>
> Kevin
>
> N9EME
>
> Fort Worth, TX
>
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