On 7/17/2013 11:27 AM, John Lemay wrote:
Chuck
Your proposal is perfectly sound. A number of commercial manufacturers use
this approach. You want to keep the weight to a minimum at the top of the
mast, so use aluminium, not steel.
The great advantage of putting the support "pylon" on the mounting plate is
that you can pre-tension the support ropes before installation, and get the
boom nice and straight. Note that some ropes will stretch more than others
over time so you might want to test it at ground levels for a day or two.
John G4ZTR
<snip>
The old 7L C3i 6-meter Yagi with near a 30' boom uses a tube like this.
Tube, or angle Mounted to the mounting plat extending up in this case
about 3 or 4 feet and use 1/2" or 5/8" tube for the truss. I replaced
the truss with the small Phillystran. As John said, you can tension it
before installation.
73
Roger (K8RI)
Thanks in advance! Always enjoy the wealth of knowledge on this reflector!!
Chuck KØTVD
www.dxham.net
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