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What's up with WNTD?

A

audioguy

Last night, I was tuning around and heard an odd thing on 950. It sounded like two carriers about the same strength roughly 2 Hz apart, coming from the same direction with a slight audio delay in the millisecond range, creating an echo effect. This went on all night.

Have they added a second site or why were they operating with two transmitters? A mistake? The station was unlistenable at my location.

Incidentally, I heard the classical station from Canada for the first time in the background.
 
Yes, they have two sites, one nondirectional day close to the center of Chicago, and a six tower in line directionalnight near the south city limits. I heard that years ago when they switched from day to night. Usually it lasts just a few seconds.
 
audioguy said:
Last night, I was tuning around and heard an odd thing on 950. It sounded like two carriers about the same strength roughly 2 Hz apart, coming from the same direction with a slight audio delay in the millisecond range, creating an echo effect. This went on all night.

Have they added a second site or why were they operating with two transmitters? A mistake? The station was unlistenable at my location.

Incidentally, I heard the classical station from Canada for the first time in the background.
Click to expand...


When I lived in Chicago, 950 used to do this every now and then. They
did not shut off their Western Ave. XMTR after bringing up their far south side XMTR. Can you say: OPERATOR ERROR. I wonder if a station can be fined for this type of thing.

Old Chicago
 
There's also a difference in power too. The daytime site is 1kw non-directional on 1 tower, while the nighttime site is 5kw directional on 6 towers, with most of the signal aimed north & south. Some areas that are Grade B during the day night be Grade A at night (like parts of Lake County Indiana). I know Aurora ends up out of the coverage area at night. I don't know who they're protecting at night to the west, but I know they're protecting WSBT AM 960 at night.
 
WWJ is a big pattern consideration at night. It has an NIF of around 3 mV/m. Being that close, it's a major consideration. Being on a first adjacent, WSBT would be a consideration under present rules, but not as much as a cochannel.
 
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