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,<[email protected]> 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,
[email protected] 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 -- [email protected]
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
