[Elecraft] Bass in audio is good

[N2EY at aol.com]

In a message dated 5/5/08 5:14:48 PM Eastern Daylight Time, 
lists at microham-usa.com writes:

> 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.  

Which is *not* amateur radio communication! Things like QRM, QRN and 
selective fading are not usually encountered in landline telephones.

Note also that despite the quality standards, people often have to repeat 
themselves on the telephone, spell out words and names, etc. 
> 
> 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.  

No, they shouldn't.

The 60 meter channels are shared with other services. Amateurs are secondary 
users there, and must conform to the primary user's standards.
> 
> 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. 

Agreed! But that's only on 60 meters.

Should we stop using LSB because other services don't generally use it? 
Should we channelize our bands because that's what other services do?

I say there's room for all.

73 de Jim, N2EY


**************
Wondering what's for Dinner Tonight? Get new 
twists on family favorites at AOL Food.
      
(http://food.aol.com/dinner-tonight?NCID=aolfod00030000000001)