The WMAQ-TV Transmitter

Right: WMAQ-TV's antenna atop the John Hancock Building, overlooking Lake Michigan. WMAQ-TV's antenna is on top of Chicago's 100-story John Hancock Center and is 1,456 feet above the street. It went into operation on October 1, 1969. The transmitter is an RCA TT-30 FL-1, which is actually two 15kw transmitters operating in parallel. These are operated at only 5.4kw output for a total of 10.8 kw into the transmission line. ERP is 40.1kw visual and 2.36 aural. If one transmitter fails, the other doubles power to maintain service. The other unit may then be repaired. Further protection for service is provided by duplicate power feeds from two separate substations and duplicate cooling air supplies. The antenna is split into upper and lower halves, and each half may be fed with double power. In event of diplexer failure, aural may be fed to one half and visual to the other half. If the whole antenna is wiped out, an emergency antenna on the other tower may be used.
WMAQ-TV antenna

Return to the 1970 WMAQ-TV tour

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WMAQ radio history | "Amos 'n' Andy" | "Fibber McGee and Mollie" | "The Breakfast Club"
Dick Kay | Television at the Merchandise Mart | 1970 television facilities tour | Channel 5 turns 20
The "Chicago School" of television | "Kukla, Fran and Ollie" | Dave Garroway | Mary Hartline
"Lights Out" | Sound effects | 1930 studio tour | WLS | "Empire Builders" | Barry Bernson
Floyd Kalber | The Queen of Love and Beauty | "Today's Children" | Staff announcers | Carol Marin
Ron Magers | Studs Terkel l "Chicago Tonight" | Channel 5 News scrapbooks |Roger Miller recalls
Zoo Parade | Clifton and Frayne Utley | Val Press | Len O'Connor | Johnny Erp | Bill Ray | Daddy-O
Experimental Television: 1930-1933 | Bob Deservi | Kermit Slobb | Ding Dong School | Quiz Kids
Bob Lemon | The Korshak Chronicles | KYW: The Chicago Years | WENR | O.B. Hanson | Renzo
Jack Eigen | Ed Grennan | The World's Best Cup of Coffee | Glenn Webster | Mr. Piano | Hawkins Falls
Chicago Television for Kids |
Radio Hall of Fame |The NBC News Night Report: 23 February, 1967
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