[Elecraft] Is there a reason the receive is so Skinny

[David Cole]

Joe,
You have answered a question that myself and another ham in my area have
been wondering about...  Why are we starting to see the other sideband
in some signals...  THANK YOU!

-- 
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net
for MixW support see;
http://groups.yahoo.com/neo/groups/mixw/info
for Dopplergram information see:
http://groups.yahoo.com/neo/groups/dopplergram/info
for MM-SSTV see:
http://groups.yahoo.com/neo/groups/MM-SSTV/info


On Sun, 2014-04-27 at 22:09 -0400, Joe Subich, W4TV wrote:
>  > NOW!!!!!
> > You have just Describe 98% of those who proclaim their love of
> > Contesting!
> 
> Hardly - most contesters are focused on keeping their audio "tight"
> for maximum efficiency.  Yes, some overdrive an amplifier and
> splatter but heavily compressed (low peak to average) audio is not
> "wide" and does not cause interference.  Unlike intentionally wide
> audio with excessive low end that rings and creates a false carrier
> to the point the SSB can be demodulated as AM.
> 
> It takes one look at a P3 or other panadapter to tell the difference
> between properly adjusted DX or contest audio and ESSB slop.  The DX
> or contest audio will show more high end than low end and be 2.4 - 2.8
> KHz wide.  The ESSB slop will have 20 dB or more low end than high end,
> will be 3.5 - 4.0 KHz wide and will sound muddy or 'rumble' with very
> little articulation in spite of the extra bandwidth.  The excess low
> frequency audio will push the transmitter IF and PA stages into
> compression much too soon and result audio that is "dense" and full
> to tightly packed IMD products of the low frequency (fundamental).
> If the transmitter has been modified with a wide IF filter, the ESSB
> signal will also include a regenerated opposite sideband down only
> 10 to 15 dB relative to the normal sideband due to the IMD generated
> in the overdriven IF and PA stages.
> 
> 73,