[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
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/
> --------------------------------------------------------------------
> Radio is your best entertainment value.
> --------------------------------------------------------------------
> ______________________________________________________________
> Our Main Website: http://www.amfone.net
> AMRadio mailing list
> Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
> List Rules (must read!): http://w5ami.net/amradiofaq.html
> List Home: http://mailman.qth.net/mailman/listinfo/amradio
> Post: AMRadio at mailman.qth.net
> To unsubscribe, send an email to amradio-request at mailman.qth.net with
> the word unsubscribe in the message body.
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

More information about the AMRadio mailing list

This page last updated 16 Dec 2017.