[Elecraft] Bass in audio is good

[Joe Subich, W4TV]

> '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: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] 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 <ian at gb7mbc.net> 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 
> 
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