[time-nuts] What are these towers?

[W4wj at aol.com]

So here are some URL's to explain the pattern for  KNTH...
 
If you will note, there are two Texas stations that KNTH  is protecting,
since they are SENIOR on the frequency...  Also, WAPI in  Birmingham
50KW daytime non-directional is being protected in the ENE  null.
We could go on and on!!  The first stations that must be  protected
are those ND (non-directionals) that are within several  hundred miles
of the Houston transmitter site.  Also any directionals  (DA) that do
not have nulls towards Houston must be protected.
 
Oh, 1060 and 1080 also have to be protected to a lesser  extent!!  ;-)
 
_http://www.amlogbook.com/freq/freq.htm#1070_ 
(http://www.amlogbook.com/freq/freq.htm#1070) 
 
Here is the page to look at the day and night patterns of  KNTH...  Note
that the patterns are essentially the same:
 
_http://www.radio-locator.com/cgi-bin/finder?call=knth&sr=Y&s=C&x=16&y=6_ 
(http://www.radio-locator.com/cgi-bin/finder?call=knth&sr=Y&s=C&x=16&y=6) 
 
and the stations being protected...  KOPY WSW of the KNTH  transmitter site
 
_http://www.radio-locator.com/info/KOPY-AM_ 
(http://www.radio-locator.com/info/KOPY-AM) 
 
Note that KOPY DOES NOT have a NULL towards KNTH either day or  night...
 
and note that non-directional KWEL is in the null off the back  of the KNTH
array.
 
Bottom line here...  someone wanted an AM station in  Houston...  After
a lot of midnight oil, and a lot of station day and night  pattern searches,
it was calculated that a pattern could be created for 1070 in  Houston
using 9 or 11 towers!!
 
AM antenna array black magic at work!!
 
Oh...  the AM rig is most likely GPS locked!!   ;-)  
 
 
73, Don, W4WJ
 
 
 
 
In a message dated 5/20/2011 6:47:39 P.M. Central Daylight Time,  
lowen at pari.edu writes:


On  May 20, 2011, at 7:42 PM, Jim Lux wrote:
>
> 1070 kHz is also KNX,  a 50kW clear channel station in Los Angeles.   
> That might  be why the pattern's so small in any direction but  
> southeast at  night.
>
> So what is generally south east from Houston.   Galveston, I know,  
> but that's not very far away.  Are they  trying to broadcast to Cuba  
> as well? Or the Yucatan peninsula  or oil rig  and boat crews out in  
> the  gulf?
>

Nah; KNTH is north-north-west of the population center,  and thus  
'throws' its pattern toward the population center.   FCC rules require  
a certain field strength for the station's 'city  of license' and to do  
that the pattern is pointed towards the  population center.  I remember  
hearing some SBE (Society of  Broadcast Engineers) friends talking  
about this 'crazy 11 tower  array in Texas' years ago; nice to actually  
see it from the air....  :-)



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