Bernie, I am NOT one whom believes that a 3Kc bandwidth is adequate.
The reality is that AM is DSB, Double SideBand, with carrier. So by definition, it MUST occupy more than 6Kc. You have a sideband of audio above the carrier, the carrier, and then the sideband below the carrier. I guess I missed where it was stated that AM is only 3Kc. I know for certain that My Beasts definitely are broader. I just keep from running at whatever it "would" develop if I set it up by the military manual and let her rip! I definitely HATE that nasal pinched audio! Bob - N0DGN On 3/9/2010 7:44 PM, bcarl...@cfl.rr.com wrote: > Bravo Bernie - again, GREAT comments! > > -- > > Best regards - Bry Carling, AF4K > > > ---- Bernie Doran<qedconsulta...@embarqmail.com> wrote: > >> 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 cw? >> better yet do not operate at all, look at the space saved then!!! I thought >> 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 not >> really pleasant to listen too. I have noticed the same effect on a few that >> 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 usually >> 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 box >> multiband antenna come in at the top of the heap. Dipole, open wire feeders >> from a good antenna matching device (balanced link coupled) is the simplest >> way to go with a multiband operation. The always perform well. the >> comments about " use only the " necessary power and/or bandwidth" I believe >> 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 hour >> 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 >> >> >> ______________________________________________________________ >> 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@mailman.qth.net >> To unsubscribe, send an email to amradio-requ...@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 >> > ______________________________________________________________ > 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@mailman.qth.net > To unsubscribe, send an email to amradio-requ...@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 > > -- +------------------------------------------------------------------+ | AM Amateur Radio Operator NØDGN | +------------------------------------------------------------------+ | http://home.comcast.net/~rbethman/ | +------------------------------------------------------------------+ | Bob Bethman \\\|/// " The absence of a danger | | \\ ~ ~ // signal does *NOT* mean | | rbeth...@comcast.net (/ @ @ /) that everything is OK " | +----------------------o00o---°(_)°---o00o-------------------------+ ______________________________________________________________ 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@mailman.qth.net To unsubscribe, send an email to amradio-requ...@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
