24.05.2010 22:45, Rick Westerfield kirjutas:
This would be a general definition that perhaps not everyone could
fully agree on:
Too Wide: takes up too much spectrum bandwidth for the amount of
information delivered or the speed of the information's delivery.
Rick, academically you are right. But the question/poll is about
"keyboard" modes mental limit.
For me the limit somewhere around rtty45 bw. Olivia 500 too wide, mfsk16
somewhere on the limit.
The psk31 is de facto standard. I think good idea to measure/evaluate
things with this standard.
MFSK modes are undervalued but not in every case. For good or moderate
propagation psk31 is the best (not academically). But for
poor/disturbed propagation and in higher latitudes there are better modes.
We can use many mfsk modes with different bw and tones. From standard
user viewpoint - more is less. RSID, Video ID are good things. But we
need de-facto mfsk-standard like psk31 to fire psk-folk in case of
poor/disturbed propagation to switch mode. This is
strategical/promotional BIG step.
IMO Contestia 250/4 (or /8?) is enough good bw/speed compromise to take
de facto mfsk-standard role. There are better modes/formats from speed
viewpoint DominoEX11, MFSK16 or from snr viewpoint 250/16:
So what mean "too wide mode" mentally?
http://contestia.blogspot.com/
vy73 Jaak
es1hj
Poor or disturbed propagation constrains all of us into fewer bands
for digital operations. With fewer sunspots, we all crowd the same
bands which makes the "too wide" problem worse. Some modes are very
narrow and are spectrum efficient but have little error correction.
Others are "too wide" but have lots or error correction and are
fast. As you very well know, these are the tradeoffs we all face.
This definition might cause a bit of a "Food Fight" here on this
reflector but hopefully . . . not.
Rick -- KH2DF
*From:* digitalradio@yahoogroups.com
[mailto:digitalra...@yahoogroups.com] *On Behalf Of *Jaak Hohensee
*Sent:* Monday, May 24, 2010 1:21 PM
*To:* digitalradio@yahoogroups.com
*Subject:* [digitalradio] What mean "Too Wide"?
Hi
Sometimes we hear, that mode or format is "too wide". What this mean?
Context - poor or disturbed propagation.
Please answer. Your answer help to see how different people understand
the term "too wide".
http://contestia.blogspot.com/ <http://contestia.blogspot.com/>
tnx!
--
vy 73, Jaak
es1hj
--
Kirjutas ja tervitab
Jaak Hohensee
