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/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] 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
