[AMRadio] AM IARU Region 2 Bandplan


Bob Macklin macklinbob at msn.com
Wed Mar 10 21:57:58 EST 2010


If the -3db point of your AM modulator is say 3600HZ then your signal will 
be +/- 3600Hz at the -3db point.This is 7200Hz.

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message ----- 
From: <sbjohnston at aol.com>
To: <amradio at mailman.qth.net>
Sent: Wednesday, March 10, 2010 6:06 PM
Subject: Re: [AMRadio] AM IARU Region 2 Bandplan


> The alarming confusion expressed right here on the AMRADIO mailing list
> regarding the occupied bandwidth of a DSB AM signal makes my point
> beautifully.  Most hams know what mode they are running, but few really
> know the bandwidth of their signnal.
>
> Very few hams have the knowledge, skills, or test equipment to measure
> occupied bandwidth anyway, so its use in a bandplan is a meaningless
> standard.  The common practice of tuning a communications receiver
> across a signal is NOT how to measure occupied bandwidth and will
> produce misleading results.
>
> Again, let me emphasize:  the present IARU Region 2 bandplan's
> bandwidth limitation of 2700 Hz refers to the amount of space used by
> the signal on the band, not the range of audio used to modulate the
> transmitter.  Most DSB AM signals are going to use at least 6 kHz of
> spectrum space - most more.
>
>
> Steve WD8DAS
>
> sbjohnston at aol.com
> http://www.wd8das.net/
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