mowhoong
Guest
Thu Aug 04, 2011 3:53 am
I have always wondered about the need to angle the radio antanna at 45
deg for FM and 90 deg for AM or SW mode . I would appreciate if
someone can kindly explain the rationale to me. Thanks
Regards
Phil Allison
Guest
Thu Aug 04, 2011 3:53 am
"mowhoong"
Quote:
I have always wondered about the need to angle the radio antanna at 45
deg for FM and 90 deg for AM or SW mode . I would appreciate if
someone can kindly explain the rationale to me. Thanks
** The transmission antennas are polarised differently.
FM is generally " circular " while AM is vertical.
http://en.wikipedia.org/wiki/Antenna_(radio)#Polarization
Best ( local ) reception is when the receiving antenna is the same.
Long distance reception is another ball game and polarisation may be
different after any reflection.
.... Phil
