[BC] Radiation efficiency

[DHultsman5@aol.com]

In a message dated 6/30/2006 5:02:29 PM Central Standard Time,  
walkerbroadcasting at gmail.com writes:

That  50KW on 1550 north of you in Huntsville has a pittful night  signal.

Paul




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The 1550 kHz. frequency in Huntsville is only 50 kW. in the daytime.   They 
probably have protection totoward Atlanta and the old Jackson, MS  allocation.  
Their night power is probably 500 Watts or may be 1 kW.
 
However my point is that when it comes to daytime  groundwave,  the 
conductivity  makes all the difference,  In Alabama we have  at best across ground 
maybe  8 m/mhos,  50 kw does not go as far as  the conductivitity in Iowa with 40 
m/mhos./  Ecen th coastal area have  terrible conductivity due to the sand.  
1480 kHz. between Mobile and Panama  City give each other interference due to 
the salt water but inland neither  station has much signal after 15-20 miles.   
Seawall is is the best  which is why alot of stations build in salt-water 
marshes such as Meadowlands,  New Jersey.
 
Dave