>Date: Sat, 19 Jan 2008 16:47:50 -0500 >To: Robert Dennison <[EMAIL PROTECTED]> >From: Jim Dunstan <[EMAIL PROTECTED]> >Subject: Re: [Flexradio] Fw: RE: [dxlab] Decoding CW via soundcard > >At 01:08 PM 1/19/2008 -0800, you wrote: >>Hi all, >> >><Origninal header information removed for clarity> >> >>"Dave, >> >>I hope you pass on this. MCW (CW by audio tone on a phone >>transmitter) is illegal for US stations on HF. >> >>73, >> >> ... Joe, W4TV" > >Hi Joe, > > >No offense, but I believe you are mistaking the definition of MCW ... eg a >CW signal that consists of a steady carrier with a keyed audio tone (eg >keyed audio modulation) ... definitely MCW and illegal. This would be the >equivalent to keying an audio tone into either an FM or AM transmitter. > >However, a SSB transmitter has no steady carrier ... by definition .... >and a keyed audio tone would appear as a CW signal indistinguishable from >one created by keying an RF generated signal. > >If you compare 2 signals on the air and they are indistinguishable, how >can you say one is legal and the other is illegal. In fact there are >commercial amateur radios that create CW by keying audio into a SSB chain >that are certainly FCC approved ... e.g. Collins S Line. > >Jim, VE3CI > >
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