Spectrum efficiency must be measured in time necessary to get the info across,
length of info transferred, and bandwidth.
((characters/second)/ bandwidth) or characters/(seconds * bandwidth).
The bandwidth includes a certain guard band(minimum distance between 2
different
signals), which for
But if the path S/N is so poor that you cannot get the message across at
all, isn't the spectrum efficiency zero? ;-)
73 - Skip KH6TY
Rein Couperus wrote:
Spectrum efficiency must be measured in time necessary to get the info
across,
length of info transferred, and bandwidth.
Good point. What you have defined , Rein,is the occupancy efficiency in
terms of time.. I was measuring efficiency in terms of bandwidth used.
Obviously the othe rmeasure is wether the message was deleivered. Using 5
watts for a 300-400 miles trasmission on 80M at night , PSK250 may have
needed
Hi Andy,
well, I don't agree... as soon as you talk efficiency, you have to define what
that means.
For me bandwidth efficiency is 3-dimensional, it defines how much information
can be
transferred within a certain time span, within a certain bandwidth.
JT65A works with 65 frequencies, which
I know many are already aware of this, but take a look
N9DSJ-1 (EN52ti) Heard N6TE(DM12) on 3576.23 KHz -8dB at 03:32:00Z using JT65A
N9DSJ-1 (EN52ti) Heard K3UK(FN02) on 3575.99 KHz -5dB at 03:32:00Z using JT65A
Bill N9DSJ decoded two stations within 24 Hz of each other, how is
that for
