[time-nuts] What are these towers?
W4wj at aol.com
W4wj at aol.com
Sat May 21 03:59:54 UTC 2011
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.... :-)
_______________________________________________
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
More information about the Time-nuts_lists.febo.com
mailing list