Jest taka tabela 7-3 w ARRL Ham Radio License Manual, czy to o to chodzi?
http://books.google.pl/books?id=J7wUxCzf98AC&pg=SA7-PA8&lpg=SA7-PA8&dq=ARRL+6+30+min&source=bl&ots=hTTdENDb5y&sig=rctX6q6X3qgWie1oBPFXerIhsl4&hl=pl&ei=80FZTYehL4PBtAaVn6ClCw&sa=X&oi=book_result&ct=result&resnum=7&ved=0CFQQ6AEwBg#v=onepage&q&f=false
http://books.google.pl/books?id=J7wUxCzf98AC&pg=SA7-PA8&lpg=SA7-PA8&dq=ARRL+6+30+min&source=bl&ots=hTTdENDb5y&sig=rctX6q6X3qgWie1oBPFXerIhsl4&hl=pl&ei=80FZTYehL4PBtAaVn6ClCw&sa=X&oi=book_result&ct=result&resnum=7&ved=0CFQQ6AEwBg#v=onepage&q&f=false
enjoy SWL hobby!
Robert
_________________
Robert
_________________