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About Andy Blatt
Expertise
Questions regarding transmitter engineering.

Experience
College radio: program director and general manager, WCMO, Marietta; WMRT, Marietta (OH); Announcer, WPAR; WIBZ, Parkersburg, WV; Announcer, newscaster, WMOA, Marietta and announcer, copywriter, newscaster at WVOS, Liberty, NY. Announcer, newscaster, WERA, Plainfield, NJ

Education/Credentials
BA degree in Mass Media/Management (Radio?TV & Business) at Marietta College; Courses in webpage dsign for the internet

 
   

You are here:  Experts > Industry > Broadcasting > Radio > rad

Topic: Radio



Expert: Andy Blatt
Date: 5/14/2008
Subject: rad

Question
why radio signals are more clear in nights compare to day time?

Answer
Normally. FM is line of site and unless you are basically within a straight line to the transmitter or signal, nightfall does not make much difference.  AM is different and at night, the atmosphere permits the molecules (closer together) to carry the signal farther and for longer distances.  I believe this is called the Kenelly-Heavyside layer which basically conducts the signal and when listening to a 50,000 watt (clear channel station with nothing else on that frequency) the station can usually be heard clearly over about 2/3 of the US.  Also, rainfall seems  to conduct the signal better as well, and this would be in addition to the better reception at night.

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