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
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 Grothhislens@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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participants (2)
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John Price -
Kevin Groth