[time-nuts] What are these towers?

[cook michael]

Le 21/05/2011 08:30, Robert Darlington a écrit :
> Guys, I gotta ask, what does this have to do with time keeping?   Am I
> missing something?
>
> -Bob
>
I know what you mean.  I was desperately fighting down the urge to reply 
to Lamar's post  to query the significance of cows and horses.
> On Fri, May 20, 2011 at 9:59 PM,<W4wj at aol.com>  wrote:
>
>> 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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