|
Title: AM Broadcast Station With Two Locations Post by: Steve - K4HX 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 Title: Re: AM Broadcast Station With Two Locations Post by: DMOD 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 Title: Re: AM Broadcast Station With Two Locations Post by: Lou W9LRS on April 18, 2019, 08:23:44 PM Chicago has two I know of, one is on 820 the other is 1370.
Lou I Forgot one on 1160 Title: Re: AM Broadcast Station With Two Locations Post by: Steve - K4HX 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.
Title: Re: AM Broadcast Station With Two Locations Post by: steve_qix on April 19, 2019, 09:44:54 AM WBZ (Boston MA) and WBZA (Springfield, MA) They did this for many, many years.
Title: Re: AM Broadcast Station With Two Locations Post by: kb3ouk 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. Title: Re: AM Broadcast Station With Two Locations Post by: WB2EMS 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.
Title: Re: AM Broadcast Station With Two Locations Post by: kb3ouk 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.
Title: Re: AM Broadcast Station With Two Locations Post by: Steve - K4HX 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. Title: Re: AM Broadcast Station With Two Locations Post by: W7TFO 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. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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. |