USA AM radio "clear channels"

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Re: USA AM radio "clear channels"

Postby Mrkdrnbrgr » Thu Oct 11, 2012 10:04 am

Hi Brian. I've added some info in CAPS below
Mark Durenberger


In order of frequency:

640 kHz KFI Los Angeles (although Locator says non-directional, I am puzzled by the info and pattern map)

http://www.radio-locator.com/cgi-bin/pa ... =L&hours=N

650 WSM Nashville

http://www.radio-locator.com/cgi-bin/pa ... =L&hours=U

660 WFAN in NYC (and another odd pattern for an "omni" day/night) 660 AND 880 IN NEW YORK SHARE A TOWER ON HIGH ISLAND. THE TOWER HEIGHT ISN'T OPTIMUM; THAT MIGHT ACCOUNT FOR ANY PATTERN DISTORTIONS SEEN. BUT BOTH ARE LICENSED OMNI-DIRECTIONAL

http://www.radio-locator.com/cgi-bin/pa ... =L&hours=U

670 WSCR CHICAGO

700 WLW Cincinnati ALONG WITH WSM, USES THE AWESOME-LOOKING "BLAW-KNOX" TOWERS (THE ONES THAT ARE DIAMOND-SHAPED). THE ONLY U.S. STATIONS AUTHORIZED POWER ABOVE 50 KILOWATTS (500,000 !) FROM 1934--1939.

http://www.radio-locator.com/cgi-bin/pa ... =L&hours=U

720 WGN Chicago

http://www.radio-locator.com/cgi-bin/pa ... =L&hours=U

750 WSB Atlanta

(and I ran out of my "free access for a day" at Radio-Locator!)

now manually looking through the book for "one 50 kW on a channel":

760 WJR Detroit

770 WABC NEW YORK IS A CLEAR-CHANNEL AS NOTED BY OTHERS; IT SURVIVED A 30-YEAR COURT BATTLE BY KOB ALBUQUERQUE, SO THAT KOB (AND OTHERS) MUST PROTECT WABC IN ITS AUTHORIZED SERVICE AREA. WABC IS WIDELY CONSIDERED TO HAVE THE MOST-EFFECTIVE OF THE CLEAR-CHANNEL SIGNALS, DUE TO ITS TOWER AND LOCATION.

780 WBBM CHICAGO

820 WBAP Ft. Worth, TX

830 WCCO MUSTN'T FORGET THIS HERITAGE STATION. WCCO AND SEVERAL OTHER STATIONS APPLIE FOR 750,000 WATTS POWER A FEW DECADES BACK; THE FCC DENIED ALL REQUESTS.

840 WHAS Louisville, KY

870 WWL New Orleans

880 WCBS SEE ABOVE

890 WLS Chicago ANOTHER BOOMER

1020 KDKA PITTSBURGH...LISTED BY WESTINGHOUSE AS THE FIRST STATION ON THE AIR (ACTUALLY BEAT TO THE PUNCH BY WHAT IS NOW KCBS SAN FRANCISCO AND WWJ DETROIT)

1030 WBZ BOSTON THIS CHANNEL WAS VICTIM TO SOME FCC MACHINATIONS.

1040 WHO Des Moines, IA

1100 WTAM CLEVELAND; CHANGED CALL LETTERS LIKE UNDERWEAR. STILL PROTECTED AS A "1-A CLEAR"

1120 KMOX ST. LOUIS

1160 KSL SALT LAKE CITY

1180 WHAM ROCHESTER NY

1200 WOAI San Antonio

1210 WPHT PHILADELPHIA

THERE'S ANOTHER GROUP: ONCE CALLED "1-B" CHANNELS ON WHICH 50-KILOWATTS WAS AUTHORIZED BUT THERE WERE TWO OR MORE STATIONS THAT HAD TO PROTECT EACH OTHER. I CAN PROVIDE THIS LIST IF ANYONE'S INTERESTED.

And, that's what I could find, but couldn't verify that the last few stations were indeed 50 kW "omni" day and night via Radio-Locator. Note also that some AM channels are Mexico or Canada "clear channels", and I skipped over them. Also, it is common for some of the USA "clears" to also have some low-powered stations on the same channel, but located across the continent from the main blowtorch. Example is WWLS here in Oklahoma City at 640 kHz, same as KFI Los Angeles. WWLS runs only 1 kW into a four tower array, which is obviously designed to have a DEEP null towards the west <g>.

Best,

Bri[/quote]
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Re: USA AM radio "clear channels"

Postby brianroth » Fri Oct 12, 2012 1:40 am

Mark...wow, it's fun to see an old thread I started come alive again...LOL. I have been an AM DX'er since the 1960's....but nowadays there is so much QRM on that band I could SCREAM! Nevertheless, as I drive to project sites here in the OK, KS, TX, and AR region in my car, I still surf the AM band at night.

Bri
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