[IRCA] Kinstar cage antennas approved by FCC

[Glenn Hauser <wghauser@xxxxxxxxx>]

FCC OKS NEW AM ANTENNA SYSTEM --- By Tom Smith, Chapter 24, SBE

On October 25th, the Media Bureau issued a notice that announced simplified
procedures for the authorization of the use of the KinStar antenna system by
non-directional AM stations. The FCC will not require stations to routinely
summit proof of performance, current distribution measurements of formula for
vertical plane radiation characteristics for non-directional AM stations using
this antenna.
The antenna was developed by Star-H Corporation and manufactured by Kintronic
Laboratories, Inc. The antenna is about one third the height of a normal
quarter wavelength vertical tower used by many AM stations.

The KinStar antenna consists of a cage that is .08 wavelengths high and .008
wavelengths in diameter. From the top of this cage four horizontal elements
extend out .17 wavelengths. These elements are at 90 degrees to each other (see
figure 1). 

The antenna is matched to the transmitter and transmission line with similar
units as would be used with a vertical tower, and the standard 120 ground
radial system is used.

At the bottom of the AM band at 550 kHz, the KinStar antenna would be 136.3
feet high with the horizontal elements having a radius of 306.6 feet and the
cage being 32 feet in diameter. At the center of the AM band at 1000 kHz, the
height is 75 feet, the horizontal elements radius is 168.6 feet and the cage is
17 feet in diameter. At the top of the AM band at 1680 kHz, the height is 44.9
feet, the horizontal elements radius is 100.1 feet and the cage is 10 feet in
diameter. Above 1200 kHz, wooden utility poles can be used for support, with
metal towers used for antennas below 1200 kHz.

The KinStar antenna can be used to avoid aeronautical issues as they are short
enough to normally not be lit or painted, and should be easier to get zoning
approval as their appearance would be similar to overhead power lines and would
be less visible then a tall tower.

The FCC will consider the use of the KinStar antenna for directional stations
when more information is available. The notice and the data submitted by the
designers of the system, including construction information, modeling, and
field-testing are linked to in the October 25th online edition of the FCC Daily
Digest (From http://www.fcc.gov via http://www.smpte-sbe48.org/news.asp#antenna
via DXLD)



		
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