[Elecraft] Free DV (digital voice as reported in QST-Aprilissue)

[MontyS]

Digital slowscan uses tones, just like AFSK, PSK31, or any other 
soundcard-based mode.  It does not use analog, continuously variable tones, 
like original slowscan, but discrete tones, like AFSK.   It does not use a 
bandwidth wider than a standard SSB signal, about 2.5 - 2.8 khz.  In fact 
when I receive digital slowscan I narrow the bandwidth to remove 
interference.

The worst "our frequency" offenders are the daily social nets found 
throughout the phone allocations.  One frequency on each band does not 
strike me as frequency hogging, and it does allow the few users of a mode to 
find one another.  In the case of PSK31, it allows many times more QSOs to 
be possible in the approximately 3khz segment used.

Monty K2DLJ


  I am concerned with the creepage into our phone bands of wide digital 
modes with
their raw audio when tuning in SSB mode. The occupants of these frequencies
are also typically very protective of "their" frequencies and tend to be
intolerant of "intruders".

AB2TC - Knut