K4YZ wrote:
an_old_friend wrote:
wrote:
Dan/W4NTI wrote:
wrote in message
ups.com...
Dan/W4NTI wrote:
cut Tell you what Jim, listen during a RTTY contest weekend.
Like when the
NAQP CW is on this winter season.
That's a different story.
It is just an example of what it will be like with massive
digital action.
Just watch and see.
All the more reason to have a reasonable Morse Code only subband. Say
7000 to 7050.
why?
why is it that Morse Code supporter are always insisting that Morse
Code needs props in order to survive?
Nope.
It needs reasonable bandwidth in order to avoid interference.
All modes need reasonable bandwidth in order to avoid interference.
OOK
signals to not mix well with digital and modes such as PSK31
But not because of bandwidth.
are plenty of spaces left in a natural state and protected
for those "hobbyists". Why not for Morse Code?
They are not left just for theose hobbists. Many hunderd acres ar ein
this area and never hiked to preserve the tree and lifefroms like deer
and wolves and Mtn lions
"those" "hobbyist" "lifeforms"
Sure they are left for "hobbyists", although in your example
"naturalists" is the appropriate term.
There are wilderness areas/preserves where human access is strictly
limited in an attempt to maintain the "wild" nature of the place. The
radio analogy to such preserves is the quiet zone (both geographic and
spectrum) around some radio astronomy observatories.
But that's not what I'm talking about.
There are parks, recreational areas, seashores, lakes, and other areas
reserved from "development" and access in various ways. The rules for
their use are aimed at letting "hobbyists" have the best possible
experience (as in "fun") from the area - even though the rules limit
the use of the area by some.
For example, there are plenty of such places where motor vehicles are
simply not allowed. In many cases the only way to reach such places is
to walk in and walk out. The presence of motor vehicles would change
the place, and the experience, so much that they are simply not
allowed.
There's a nature trail near my home that just opened last fall. Used to
be an interurban right-of-way. It's a favorite for walkers, runners,
bicyclists and rollerbladers. No motor vehicles of any type are
allowed, even though the surface is paved.
At the other end of that spectrum is the Appalachian Trail, stretching
from Stone Mountain in Georgia to Mount Katahdin (sp?) in Maine. No
motor vehicles or even wheeled vehicles allowed on most of it.
Does walking need "props" in order to survive?
the question is why is Morse Code entitled to a such a preserve all to
itself?
Why not?
The ONLY mode that OOK is compatable with is Single Side Band.
In some ways yes, but in most ways no. Even those two modes are
incompatible in many ways. That's why they have separate subbands.
Consider the fact that most "data" modes are not allowed in the
voice/image subbands. Is that a "prop" so that SSB and AM will survive?
Imagine a stretch of band where there are Morse Code signals every 1
kHz. Is there anyplace in such a band where an SSB voice signal can
operate without causing interference to at least one Morse Code signal?
And why if it is Such an EFECTIVE mode does it need the protection?
"EFFECTIVE"
There's a fundamental divide appearing in radio modes nowadays.
Modes like Morse Code and the analog voice modes are real time, "direct
experience" modes. A human listens to the demodulated signal directly,
in real time.
The "digital" modes are fundamentally different in that there is
decoding beyond the demodulation process. A machine does the decoding -
the human does not 'listen' to the signal at all in most cases.
Look at PSK31 - you see a particular pattern on the waterfall, click on
it, and the decoded text appears. If there is interference, the text is
garbled, and there's not very much you can do about it. And what you
can do is a matter of equipment adjustment, not skill in listening.
Because of this difference, it makes sense to allow certain modes -
like Morse Code - a place free of interference from "machine modes",
just like the trails where motor vehicles are not allowed.
Voice modes like SSB and AM are protected from modes like PSK31 and
RTTY. The spectrum allowed to those modes in the US HF ham bands
amounts to more than half the total spectrum available! If such
protection is good enough for SSB and AM, why not Morse Code?
73 de Jim, N2EY