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AM Broadcast Station With Two Locations




 
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Author Topic: AM Broadcast Station With Two Locations  (Read 913 times)
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Steve - K4HX
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« on: April 18, 2019, 03:57:26 PM »

I was poking around on Radio-Locator today and came across a station with two different transmitter and tower locations. One is used for daytime and the other for night. This sites were easily 20 miles apart. Has anyone seen this before?

https://radio-locator.com/info/WQLL-AM?loc=39.30796%2C-76.61702&locn=Baltimore%2C%20Maryland
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DMOD
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« Reply #1 on: April 18, 2019, 05:32:49 PM »

I was poking around on Radio-Locator today and came across a station with two different transmitter and tower locations. One is used for daytime and the other for night. This sites were easily 20 miles apart. Has anyone seen this before?

https://radio-locator.com/info/WQLL-AM?loc=39.30796%2C-76.61702&locn=Baltimore%2C%20Maryland


Not unusual at all. Many stations around St. Louis for example have different day/night tower fields in close proximity.

https://www.fcc.gov/media/radio/am-query


Phil - AC0OB
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Lou W9LRS
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« Reply #2 on: April 18, 2019, 08:23:44 PM »

Chicago has two I know of, one is on 820 the other is 1370.
Lou

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Steve - K4HX
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« Reply #3 on: April 19, 2019, 08:09:46 AM »

DMOD, in this example the two tower fields are 20-25 miles apart (different sides of the city). This means that two (or four with back ups) transmitters are needed. Is this really that common? I only see one like this in St. Louis.
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steve_qix
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« Reply #4 on: April 19, 2019, 09:44:54 AM »

WBZ (Boston MA) and WBZA (Springfield, MA)  They did this for many, many years.
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kb3ouk
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« Reply #5 on: April 19, 2019, 11:40:36 AM »

WBZ (Boston MA) and WBZA (Springfield, MA)  They did this for many, many years.

Those were synchronized too i believe. Separate day/night sites aren't unheard of, but not common either. In the case of WQLL, with those nulls in the night pattern they wouldn't be able to cover the target metro from the day site with a similar pattern, and the day pattern would not cover the metro from the night site either, so in a situation like that it makes sense. A lot of these separate site stations seem to come about because they want to run a whopping signal at night but the day site would not allow for a pattern that protect other stations adequately.
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WB2EMS
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« Reply #6 on: April 19, 2019, 02:26:34 PM »

WHCU 870 Ithaca does this.  5 kw omni near the city by day, 500 watt south of the city firing over it with a notch to protect a station in New Orleans by night. 

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kb3ouk
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« Reply #7 on: April 19, 2019, 06:24:27 PM »

There's a station in either Syracuse or Rochester that has a nighttime site on a rooftop in town that runs about 55 watts, that power from their day site wouldn't reach the population.
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Steve - K4HX
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« Reply #8 on: April 23, 2019, 09:35:55 PM »

The cost would seem prohibitive, especially with these 4,5 and six tower arrays. I guess it works.

Interestingly WQLL is a music station - not too common on the AM band any longer.
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« Reply #9 on: April 24, 2019, 10:53:31 AM »

KOOL AM in Phoenix had two sites, day & night.  Both were DA.  New owners have changed that.

BTW, they had an FM, running 52kW up 5" coax to a 4-bay rototiller atop South Mountain  Channel 10 TV, too.

Champions of flamethrowers, and the owner also raised Arabian horses.  Must be nice.
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