[BC] Short AM Tower

[Bobby Cox]

For cases when you can't get authority to put up a normal tower height,
the low profile antenna that Kintronic dubbed the "Kinstar" will give
effectively the same efficiency as a quarter wave tower, yet it's only
around 28.8 degrees tall.  For 1230 kHz, the Kinstar would have a tophat
that averages 64 feet above ground level.  This would therefore use
poles or short towers roughly 70 feet tall.  One drawback is that you
need 5 of these poles though.  Their footprint will fit within the 90
degree ground radial system though, so it's no larger in land
requirement than normal.  It's a simple design with no smoke & mirrors
involved.  It's a heavily top loaded monopole configuration, and it's
FCC approved.  It's also going to give much better bandwidth than a 45
degree tall monopole with a guy wire tophat. Your client would have to
apply for a CP for the Kinstar antenna specifically from the outset
though.  

I'd be happy to give you more information off the list if you're
interested.
Thanks.

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: broadcast-bounces at radiolists.net
[mailto:broadcast-bounces at radiolists.net] On Behalf Of Stevan A. White
Sent: Thursday, January 03, 2008 1:08 PM
To: Broadcasters' Mailing List
Subject: Re: [BC] Short AM Tower

You may want to investigate the possibility of top loading the tower 
using guy wires bonded at the top of the tower and insulated at just the

right spot to provide the correct amount of loading.  I've seen this 
done successfully at a little station I used to take care of.  There are

others who can chime in with further details and perhaps help you with 
calculations and design.

Best Regards,
Stevan A. White, W5SAW
SW Commercial Electronics
928 South Crockett Street
Amarillo, Texas 79102
Phone 806-681-7228
w5saw at pathwayz.com

"The hardest arithmetic to master is that which enables us to count our 
blessings."
(Eric Hoffer, American Author)



Larry Lamoray wrote:
> For the brain trust ....
>
> Have a client trying to use a 100 ft tower for AM on 1230. 200 feet is

> prohibited by local ordinance. :-((
>
> Any suggestions as to how to make the best of a bad situation?
>
> Thanks in advance.
>
> Larry
>
>
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