|[AMRadio] AM IARU Region 2 Bandplan|
Brett.Gazdzinski at verizon.net
Tue Mar 9 20:23:29 EST 2010
I usually limit my audio to between 4 and 6 Kc.
I cant hear anything over 3000 Hz anyway, so it all sounds like ssb, even if
I am not on the radio!
What I don't like, and what does all AM'ers a disservice is guys who get on
in prime time, run over 10Kc on both sides of the carrier, using a multiband
compressor that keeps the entire bandwidth at a high level, and takes out 4
If you take out 25 or 30 KHz and center at 3880, you take out 3765 to 3895.
People see that (and with sdr radios, you CAN see it), and think why don't
they ban that crap!
----- Original Message -----
From: "Bernie Doran" <qedconsultants at embarqmail.com>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Tuesday, March 09, 2010 6:50 AM
Subject: Re: [AMRadio] AM IARU Region 2 Bandplan
> reading these comments about bandwidth suggests to me that there are more
> than a few the believe under 3 kc bandwidth is fine for AM as it conserves
> space. if so why does one even operate AM? why not use only ssb, psk or
> better yet do not operate at all, look at the space saved then!!! I
> most operated AM because they like the quality of the audio produced. one
> thing the SDR-Iq that I acquired a few months ago does rather well is show
> the spectrum, on the local BC stations they seem to limit sharply at a
> total 15 kc. I have watched the male voice spectrum and with the exception
> of the S,F and C sounds nearly all is below 5 kc each side. narrowing to 3
> kc with below 300 cutoff turns those same voices into something that is
> really pleasant to listen too. I have noticed the same effect on a few
> are trying AM with a rice box that uses only 300 to about 3kc. the same
> thing can be observed with the ESSB guys on the bottom of 80, they sound
> much better, but still a little strange.
> again, this is good reason to operate down low on 80 where there is
> plenty of room. if there are contests it might be best to simply avoid
> operating, not only to give the contesters a band, but to simply avoid the
> QRM created by others. However, there is so much racket no one would
> notice if an AM station was 30 kc wide during the contests.
> RE the comments about power, the antenna is far above every thing else,
> listen to what the strong stations are using, rarely does an out of the
> multiband antenna come in at the top of the heap. Dipole, open wire
> from a good antenna matching device (balanced link coupled) is the
> way to go with a multiband operation. The always perform well. the
> comments about " use only the " necessary power and/or bandwidth" I
> that to mean full quieting and the audio quality of a person sitting the
> same room with me. It does not mean if I am on a particular freq for an
> or so and someone decided to operate 1.5 kc away that it is my fault for
> causing QRM to them. some of these comments sound similar to those I have
> seen where it is believed that we are supposed to be on certain freq (
> channels) . At least there has been a lot of chatter on this topic. that
> is good. 73 Bernie
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