> 'Information rate' is I suppose the let-out. Information rate is not a "let out" in analog voice.
> I would have thought that the use of ESSB would come close to > breaking the rules on Emission Standards as imposed by some > regulators, e.g. FCC Amateur Rules section 97.307 which says > in part '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'. This is key and should be enforced. Many years ago Bell Labs (and others) proved rather thoroughly that 2.4 to 2.6 KHz was more than adequately for "communications" purposes. Their tests were specifically in relation to "toll grade" audio for long distance telephony. The FCC rules specifically required a maximum bandwidth of 2.6 KHz on the US 60 meter channels. That should provide a strong example of what FCC and NTIA consider to be the "maximum bandwidth necessary" for single sideband operation in amateur allocations. Most amateur transceivers use 2.4 KHz bandwidth filters for SSB generation - even cascaded 2.4 KHz filters with an effective bandwidth in the 2.2 KHz range. The default SSB transmit bandwidth for the K3 should be 300 - 2900 Hz or 200 - 2800 Hz in order to not be excessively wide and meet the FCC regulations for use on the US 60 meter allocation. 73, ... Joe, W4TV > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Geoffrey Mackenzie-Kennedy > Sent: Monday, May 05, 2008 2:37 PM > To: Elecraft Discussion List > Subject: Re: [Elecraft] Bass in audio is good > > > Ian J Maude <[EMAIL PROTECTED]> wrote: > > > Good idea, give them 5kHz :-) > > > > Sorry, I could not resist! > > I would have thought that the use of ESSB would come close to > breaking the > rules on Emission Standards as imposed by some regulators, > e.g. FCC Amateur > Rules section 97.307 which says in part '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'. > 'Information rate' is I suppose the let-out. > > 73, > Geoff > GM4ESD > > _______________________________________________ > Elecraft mailing list > Post to: [email protected] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
