[TowerTalk] Performance of the C4/E on Warc and 40 M?

[n4kg@juno.com]

The best solution is to be sure the antenna is high enough that
all angles below 30 degrees pass over the building and not intersect
the roof.  This can be done by ensuring the tower height is at least
1/2 the distance to the edge of the roof in all directions.

de  Tom  N4KG


On Mon, 7 Aug 2000  "Al Williams" <alwilliams@olywa.net> writes:
> 
> For beams mounted on buildings, especially commercial building that 
> may have
> metal in roof (even all metal roof), is the height for wave angle 
> purposes
> the height above ground or above the building?
> 
> k7puc
> 
> -----Original Message-----
> From: kd4rwn@bellsouth.net <kd4rwn@bellsouth.net>
> To: towertalk@contesting.com <towertalk@contesting.com>
> Date: Monday, August 07, 2000 12:37 PM
> Subject: [TowerTalk] Performance of the C4/E on Warc and 40 M?
> 
> 
> 
> Hello All,
> 
> I am about to undertake some Antenna Upgrades and was
> considering the C4/E family for the new primary beam. It would
> replace an aging Th-6 (Which would probably just move 30 ft down
> the tower). A little background first. The Tower is 40 ft of Rohn 25,
> but the Tower is mounted on the 5th floor of the building, on one of
> the sides. So the beams' height is really about 100 ft. This is for a
> University Club Station. My questions are the following:
> 
> 1. How does the C4/E family perform on the Warc Bands? I know
> it’s not designed for it, but it does have gain.. We have tuners so
> that’s not a problem. How does it compare to, let’s say, the 3
> element Warc from Cushcraft or other similar sized beams?
> 
> 2. How does it perform on 40 M? We currently have up a 1/2 Wave
> Dipole at 35 feet, Beaming EU/SW. The takeoff angle is a wee bit
> high, but it does get out. The 40 Element of the C4 would be about
> 10 ft higher. I know the Bandwidth is about 1/2 of the dipole, But
> would performance differences can we expect, Especially for DX?
> 
> Thank you all in advance for the help. Much appreciated by this
> station...
> 
> Ulysses Rodriguez - KD4RWN
> President - University Of Central Fl ARC (K4UCF)
> Member: ARRL, FCG, WWYC # 77
> kd4rwn@bellsouth.net
> 
> 
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> 
> 
> 
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