[TowerTalk] Round vs. Flat
Tue, 4 Sep 2001 20:54:48 -0000
What exactly do those numbers mean? When the elements are
braodside to the wind it's 11.5 and when parallel it's 4.1? Obviously
not, but what number should be used when figuring how much to
(over)load a tower?
On 4 Sep 01, Kurt Andress wrote:
> Hi Gary,
> Dan's answer about using the "round" tower area rating for cylindrical antenna members is right.
> You don't want to be using that old 9.4 sq ft "effective area" for the TH7.
> You want to use the projected area, which is 11.5 sq ft for the elements, 4.1 sq ft for the boom.
> Roger Cox, at the original Hygain, corrected the area figures for many of their antennas, and
> notified TT in a post on Aug 18, 1998.
> The old Hygain website had this information. The new MFJ/Hygain website is being reconstructed, and
> the information is not currently available. Hopefully, it won't get lost in the shuffle.
> 73, Kurt, K7NV
> Gary B wrote:
> > I am making the final decisions on my tower. I have selected the Trylon
> > T-600 self-supporting tower. However, Trylon specs show Projected Surface
> > Area loading as a function of 'round' or 'flat'. While the terminology
> > appears to define itself, I cannot say with any confidence that I know what
> > is meant. I plan to use a Telex/HyGain TH7. Does any TT'er know if this
> > antenna (rated at 9.4 sq ft) is 'round' or ''flat'? The specs in the
> > instruction manual make no mention of round or flat. In the generic sense,
> > what does Trylon mean? (I have not seen this thread appear previously on
> > this reflector.)
> > Thanks
> > Gary B
> > k3gb
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