Re: [amsat-bb] Cross Boom

["Edward R. Cole" <al7eb@xxxxxxxxxxxxx>]

Jim,

This reminds me that I constructed an 18-turn 437 MHz helix years ago using
an 8-foot 1-1/8 inch closet pole and found the same thing...it broke off.
I don't think they are strong enough for antenna use.

For my M2-436CP42 I just mounted the antenna on 1-1/4 inch ID sched-40
aluminum tubing (the right size for the G5400) in the "x" configuration
with fine performance.  Wood or fiberglass is an uneeded cost IMHO.

73, Ed - AL7EB

At 11:17 AM 3/4/2003 -0800, Jim.Walls@sce.com wrote:
>Ben - K9BF asked:
>>  I have the rotor, tower and antennas, now I need a none conductive
>> cross boom. What are some of you using for this purpose? Pole
>> vaulting pole? Wood inside PVC?
>
>When I first put up a satellite station, I was using a 12 foot long 1 1/2
>inch wooden pole (heavy duty closet rod) with a steel tube tube over the
>wood for the center section.  There was about 2 feet or so of just wood at
>the ends where the antennas were connected.  At one point I broke the wood
>pole while doing some work on the antennas by rotating the 2M antenna into
>a ladder while I could not see the antennas - rotor 1, boom 0, time for a
>new boom.
>When I replaced the boom, I used a steel pole, and have not noticed any
>obvious degradation of the antenna performance.  The elements are oriented
>in a X configuration rather than a +
>
>73
>-----------------------
>Jim Walls - K6CCC
>k6ccc@amsat.org
>Mobile Radio Operations
>Southern California Edison Co.
>Ofc:   626-302-8515   -   PAX   28-515
>FAX:   626-302-7501   -   PAX   27-501
>
>
>
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