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, lo...@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@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.