I just don't get it. It has been many years since I have seen a crowded band but who knows what the next sun spot cycle may bring! Beside's Don, I have checked your bandwidth many times and found you to be very close to the so called desired width of +/- 3300 Hz. I can't say with any accuracy of course, but I have twisted the knob on the XTAL filter to a narrow width, not very comfortable with CW even, and found your shots to be very few and far between and weak out beyond 3.5KHZ. Not that they are not occasionally there but another signal similar to yours could easily be copied with a carrier just 5KHZ higher or lower than yours just by using the phasing control a little.
What is it that makes certain folks so hateful? Let's talk about hate. I hate those head lights with the extended blue range. One glance at one of those and I see spots. What have I got to do get a windshield with a high end filter that rolls off the blues? I think there could be a song in there somewhere. "Them Headlights That Gime da Blues" John, WA5BXO -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of D. Chester Sent: Thursday, April 17, 2008 1:22 PM To: amradio@mailman.qth.net Subject: [AMRadio] Anonymous QST Author suggests that Part 97 requires 6 kHzAM Bandwidth Limit On p. 64 of the May issue, the anonymous writer of the monthly Q-A "Workbench" column in QST entitled "The Doctor is In", responds to a report by the coordinator of the ARRL OO program regarding "wide AM signals with bandwidths of up to 30 kHz on 75 m." He briefly explains the relationship between signal bandwidth and the frequency response of the audio that modulates SSB and AM transmitters, then states that Bell Labs concluded many years ago that high quality voice transmission (toll quality in telco terminology) can be carried over a 300-3300 Hz frequency response, but that "This worked better for the grey-haired Bell scientists who were likely to have lost some of their high frequency hearing". He goes on to allege that an AM signal occupies "a bit more spectrum" than two SSB signals, based on the notion that there is no need to transmit audio frequency components of the voice that fall below 300 Hz, and that the "usual approach" with SSB is to transmit frequencies from 300 to 2700 Hz. He then cites ยง97.307 of the FCC rules that states "No amateur station transmission shall occupy more bandwidth than necessary for the information rate and emission type being transmitted, in accordance with good amateur practice." Since voice is what is being transmitted, he suggests that the rules require AM to occupy a bandwidth of "no more than about 6 kHz". ______________________________________________________________ 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 Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. ______________________________________________________________ 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 Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.