[BC] Short AM Tower-POLNET

[Dave Dybas]

Guys,

The POLNET folded unipoles were necessary to get past the local zoning
restrictions. The village allowed towers up to 100 ft tall, obviously to
accommodate their need for Cellular service, but would not allow anything
taller than that.

The 4 tower folded unipole array performs fine, as designed, but is a bit
inefficient (80% coverage)compared to a properly sized 1/4 wave height
array. 

Dave Dybas


-----Original Message-----
From: broadcast-bounces at radiolists.net
[mailto:broadcast-bounces at radiolists.net] On Behalf Of Bobby Cox
Sent: Friday, January 04, 2008 10:13 AM
To: Broadcasters' Mailing List
Subject: RE: [BC] Short AM Tower

Yes, we built that phasor for Polnet in late 
1999.  It was certainly not an ideal 
situation.  As I recall it, they had to use those 
short, grounded, self supporting towers with top 
hats and skirt kits (with no stubs) in order to 
fit within local restrictions on towers.  Mark 
Mueller managed to get that one wrestled in and licensed.

Best Regards,

Bobby Cox , Ph.D.
Senior Staff Engineer
Kintronic Laboratories, Inc.
Phone:  423-878-3141
Fax: 423-878-4224
Email:  bcox at kintronic.com


-----Original Message-----
From: Patrick Griffith, N0NNK / WPE9HVW
Sent: Friday, January 04, 2008 10:07 AM
Subject: Re: [BC] Short AM Tower

I presume that WNVR/1030 in Vernon Hills IL ran into some kind of local
restriction when they built their DA in 2000. It consists of four
36.60° (~97 feet) towers with 9.40° tophats consisting of 6
horizontal elements. I believe the towers are fed as folded unipoles.


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