Early Morning DX Question

[Rob]

I do scan the MW band but I'm curious, how come I hear what sounds like Mexico on 750 and on various other frequencies where a 50KW station would come up, right during daybreak? 650 is another example. I'm not that far from Nashville but out of the groundwave.

Does this have to do with stations switching to daytime patterns? I heard early mornings is a great time for DX.

-Rob

 

[radioman148]

I do scan the MW band but I'm curious, how come I hear what sounds like Mexico on 750 and on various other frequencies where a 50KW station would come up, right during daybreak? 650 is another example. I'm not that far from Nashville but out of the groundwave.

Does this have to do with stations switching to daytime patterns? I heard early mornings is a great time for DX.

-Rob

Sounds like you're picking up Venezuela & I believe Colombian stations which are on those frequencies.

 

[Rob]

But, what about the american stations? why do they fade in the sunrise?

 

[fldxer]

That would be the greyline factor

 

[davideduardo]

Sounds like you're picking up Venezuela & I believe Colombian stations which are on those frequencies.

This would not be Colombia, but probably Venezuela. 650 is the 50 kw at Maracay, and 750 is the 100 kw in Caracas, but pretty near the coast. 650 in Colombia is way inland in Bogota and 750 is Medellin, far to the West and well inland and surrounded by mountains.

Even back to the 60's the two Venezuelans would be widely heard in the eastern US as far north as NY and Ohio...

Mexico has nothing of any really significant power on 650 or 750, and most Mexican AMs outside the bigger cities are not on at daybreak EST.

 

[radiotower40]

I do scan the MW band but I'm curious, how come I hear what sounds like Mexico on 750 and on various other frequencies where a 50KW station would come up, right during daybreak? 650 is another example. I'm not that far from Nashville but out of the groundwave.

Does this have to do with stations switching to daytime patterns? I heard early mornings is a great time for DX.

-Rob

Rob, I'm not exactly sure where you are at, but, it could be possible that you are hearing AM 750 WNDZ
from Portage, In.(Chicago). They are 15kw, and they sign on at 6:30 CST, instead of 6:45 CST like most of the
other Chicago stations, in November. They are a brokered station and run Spanish language programing most
mornings, at sign on.

It is just a thought but, I think it's possible that their signal could travel some distance for a short time frame,
especially in late November when our local sunrise is 6:56 AM, and they sign on at 6:30 AM.

I just thought I would throw this out there, as it might be possible. I say this because when I was just outside
of Nashville a couple years ago, and trying to listen to WLAC, I was receiving skywave from WWHN in Joliet, Il.
very audible under WLAC, just before sunrise. WWHN is only 600 watts during critical hours, and 1kw the rest
of the day, I can barely hear them at sunrise here in Chicago. They are usually on the air before local sunrise,
I'm not sure why, I don't believe they are licensed for Pre sunrise operations.

 

[stormy01]

I just thought I would throw this out there, as it might be possible. I say this because when I was just outside
of Nashville a couple years ago, and trying to listen to WLAC, I was receiving skywave from WWHN in Joliet, Il.
very audible under WLAC, just before sunrise. WWHN is only 600 watts during critical hours, and 1kw the rest
of the day, I can barely hear them at sunrise here in Chicago. They are usually on the air before local sunrise,
I'm not sure why, I don't believe they are licensed for Pre sunrise operations.

There is a PSRA on the FCC website for WWHN:
http://licensing.fcc.gov/cgi-bin/prod/cdbs/forms/prod/getimportletter_exh.cgi?import_letter_id=4472