[amsat-bb] Re: Cross boom question

[Jerry]

 Amen: I have been aluminum cross booms for several years now.
           Jerry w0sat

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Jim Jerzycke
Sent: Saturday, July 25, 2009 4:36 PM
To: amsat-bb at amsat.org; Kevin Groth
Subject: [amsat-bb] Re: Cross boom question

This has been gone over a zillion times.
Short answer; Mount them in an "X" configuration and don't worry about it.
http://www.g6lvb.com/fibermetalboom.htm

--- On Sat, 7/25/09, Kevin Groth <hislens at gmail.com> wrote:

From: Kevin Groth <hislens at gmail.com>
Subject: [amsat-bb]  Cross boom question
To: amsat-bb at amsat.org
Date: Saturday, July 25, 2009, 1:47 PM

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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