[time-nuts] What are these towers?
Robert Darlington
rdarlington at gmail.com
Sat May 21 06:30:48 UTC 2011
Guys, I gotta ask, what does this have to do with time keeping? Am I
missing something?
-Bob
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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