Hi Larry, This is not AM. I have run AM for many years, matter of fact it's one of my main operating modes. There is no carrier on any of these signals. At this point, I don't know what they are, since they can not be tuned by conventional means. They are most certainly voice emissions, and I'm 99% certain it is not digital.
I would really appreciate anyone giving a listen tonight anywhere between 3700 and 3750 and see what you think. Most the signals here are rather weak. Of course there are some AM signals in the area too, but these have no carrier. Brian On 12/19/06, Larry W8ER <[EMAIL PROTECTED]> wrote: > Jim, > > Without knowing exactly what you are listening to, I can only surmise by > your description. It appears that you are listening to AM activity. 3725 has > long been adopted by the Canadians as an AM frequency and when the new phone > bands became available, many of the operators are conforming to the Canadian > use pattern. > > The practice of using LSB below 9 mhz and USB above is an archaic practice > that was developed way way back due to the original 9 mhz xtal filters and > the fact that mixing arrangements were made easier by this convention. There > is nothing that prohibits USB or LSB from being used anywhere. > > Looking at an AM signal (SSB of course is AM with the carrier and LSB > removed) shows that the USB signal is derived from the carrier being lower > than the the mixed RF/Audio products, not above. It should NOT be possible > to copy an USB signal by merely moving the filter passband. > > Carefully zerobeating the carrier of an AM signal and switching between LSB > and USB should yield the same results. If there is no carrier (DSB supressed > carrier), selecting either USB or LSB should yield satisfactory results > after placing the signal in the center of the passband. The mode change is > simply reinserting the carrier in the correct place for decoding the audio. > > I hope that helps! > > --Larry W8ER > > > > ----- Original Message ----- > From: "Jim Lux" <[EMAIL PROTECTED]> > To: "A.R.S. - W5AMI" <[EMAIL PROTECTED]>; "Flex Radio" > <FlexRadio@flex-radio.biz> > Sent: Tuesday, December 19, 2006 10:33 AM > Subject: Re: [Flexradio] SSB Voice inversion > > > > At 07:06 AM 12/19/2006, A.R.S. - W5AMI wrote: > >>With the recent band expansions, I've noticed a lot of SSB ops using > >>voice inversion in the new areas of the phone subband on 80 meters, > >>most around 3.725. I found it easy to decode the inversion on the > >>Flex by moving the entire passband to the opposite side of the > >>selected sideband on the console. Unfortunately, it doesn't appear > >>that one is able to transmit voice inversion by adjusting the tx > >>bandpass to the opposite side. I don't know if this is simply limited > >>by the spinner controls for the limits, or if there is some other > >>reason the Flex could not do this. > > > > > > Is this different than LSB vs USB? I would interpret voice inversion > > as putting the residual carrier on the high frequency side, as > > opposed to at "zero". > > > > For SSB, though, it's a suppresed carrier mode, essentially with the > > baseband audio "translated" to some RF frequency. You can either > > translate it right side up (high audio = high RF) (USB) or upside > > down (high audio = lower RF) (LSB). By convention, bands below 9MHz > > use LSB (because that's what early SSB rigs used as an IF to make the > > SSB by the "filter method") > > > > > > > > Jim, W6RMK > > > > > > > > _______________________________________________ > > FlexRadio mailing list > > FlexRadio@flex-radio.biz > > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > > FlexRadio Homepage: http://www.flex-radio.com > > > > -- "There is nothing more uncommon than common sense." -- Frank Lloyd Wright _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
