To: WSFAlist at keithlynch.net
Date: Thu, 18 Jul 2002 10:45:37 -0400
Subject: [WSFA] AM radio
From: ronkean at juno.com
Reply-To: WSFA members <WSFAlist at keithlynch.net>

On Thu, 18 Jul 2002 00:59:14 -0400 "Ted White" <twhite8 at cox.net> writes:

 As for AM, it's lower-fi, and
> only theoretically has stereo-broadcasting capabilities (the
> FCC never approved a format for stereo AM, preferring to let
> competing formats battle it out; instead they simply died
> for lack of support -- back in the late '70s), and can't be
> heard after dark unless you have a "clear channel" and lotsa
> watts.
>

At night, the ionospheric 'skip' phenomenon sometimes allows AM broadcast
band transmissions to be received hundreds or even thousands of miles
away from the transmitter, something which usually happens at higher
'shortwave' RF carrier frequencies, both night and day.  Perhaps Keith
can explain why 'skip' at 1 MHz carrier frequencies only happens at
night, and not during the daytime.

Ron Kean

.

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