I know the 680 signal situation very well since I moved WRGC-Sylva, NC to 540 then sold it. WRGC is not the limiting factor to WCNN at night. As others have suggested, the big 50KW WPTF in Raleigh creates the huge wall off to the northeast. I think WCNN can send something like 47 watts toward WPTF. Thus why they have 8 towers to get 10KW. The 680 in Memphis isn't as controlling but its a big factor too.
In the daytime, WCNN could drop their two tower directional and go non directional since WRGC is no longer on 680 but they would actually lessen their daytime signal to the southwest through the heart of Atlanta. As far as reception is concerned, WCNN caused WRGC more headaches than WRGC did to WCNN. Not sure if dropping the DA at WCNN is even worth the cost nowadays.
When WSB went FM, I think they took a huge chunk out of the life of any AM station within 100 miles of Atlanta even the big signal ones like WCNN.
In the daytime, WCNN could drop their two tower directional and go non directional since WRGC is no longer on 680 but they would actually lessen their daytime signal to the southwest through the heart of Atlanta. As far as reception is concerned, WCNN caused WRGC more headaches than WRGC did to WCNN. Not sure if dropping the DA at WCNN is even worth the cost nowadays.
When WSB went FM, I think they took a huge chunk out of the life of any AM station within 100 miles of Atlanta even the big signal ones like WCNN.
secondchoice said:jabba17 said:I thought that the station in Raleigh (http://www.radio-locator.com/info/WPTF-AM ) was the real concern for 680 addressing that big ol' NE null.
Looking at the night coverage for WCNN:
http://www.radio-locator.com/cgi-bin/pat?call=WCNN&service=AM&status=L&hours=N
IMHO The best they could hope for is at night time keep the North East null "to protect Raleigh" but loosen up due north and northwest. I assume they protect Memphis with the null just south of Rome. There is the Corbin KY and Newburg (Louisville) KY stations to protect too. It would be great for WCNN to get a night signal into Gainesville GA.