In the 70s, while in Homestead Florida, at times I saw TV Channel 6 from Havana. Having seen comments about signals that seem to wander well beyond their FCC confines, I wondered if Longley Rice can predict some of that. For example, signals near the Pacific Ocean in California often are heard well beyond expected distances. The FCC does not consider atmospheric ducting (super refraction). I can. I ran this 600 kilometer radius Longley-Rice study of a TV 6 in Havana. I set climate model to 7, Maritime Temperate, over sea, not the usual FCC 5. I set time probability to 2%, not the usual 10% for interfering signals. Cuba does not seem to notify their transmitter locations, so I looked and found hotel Habana Libre. It has antennas, was built in 1958 and looks like a possible site for the original TV6 install. From what I read the channel is now Cubavision, a program intended for reception in other countries, and after looking at this LR study, you might see that could make some sense. Maybe when I was in Florida, I was watching a standard RCA 100 kW low band VHF transmitter package, so 100 kW went into the study. RCAMSL is at 150 meters derived from information on the hotel. Just to note, ducting propagation can be better lowering the transmitter height. I dont know if Longley Rice deals with that. At the time WCIX (TV) Miami had a tower in Homestead. As I remember it, even when WCIX was on air, I could see the interference from Havana. articles.sun-sentinel/1989-04-11/news/8901190222_1_transmitter-power-failure-wcix
Posted on: Sat, 13 Sep 2014 06:30:10 +0000
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