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, ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
