On Sun, Dec 30, 2018 at 06:19 AM, w7hd.rh wrote:
Keep in mind that SSB and CW have a 6dB advantage over all other modes.? They are highly preferred for satellite and moonbounce contacts, and often can be used for relatively local contacts, as
Incorrect.? CW has a 6-10db advantage over SSB and SSB beats am by about as much.? However the slow
digital modes oten beat CW by at least 20DB and sometimes more.
the Band width avantage is log10(BW) where AM is about 10khz and Digital is near 1-2hz a
5000-10000:1 advantage (10,000= 40DB).? So every time you narrow the detection bandwidth?
by 1/10 you gain 10DB till you hit practical physics limits (KTB).? The trade is effective data or
communications speed (voice forces a 2khz bandwidth more or less) goes down as well.
Allison
