It sounds to me that a confidence level like that simply means it "knows"
what signal mode it is hearing. Personally, it would appear to me that the
question is ":Is there another signal of ANY kind on the frequency?" If
there is, it should NOT attempt to use the frequency, unless it is the SAME
mode it itself is using, and then, only if it recognizes it is being
called - or the other end is CQing, should it then attempt a contact.
It would be nice to be able to tell what mode is operating on a frequency,
and have our own software switch to that mode. If I remember correctly,
LanLink had similar capability back in the 80s, and was available for some
TNCs, including the MFJ 1278b. But, this is not the primary reason, as I
now see it, for the auto digital modes to need to insure that other signals
are not on a frequency, before transmitting. ANY activity on a frequency
should prohibit the auto modes from transmitting unless they recognize it
is a signal for them, and that would apparently be an easier programming
step, than having them recognize all the other modes.
Danny Douglas N7DC
ex WN5QMX ET2US WA5UKR ET3USA
SV0WPP VS6DD N7DC/YV5 G5CTB all
DX 2-6 years each
.
QSL LOTW-buro- direct
As courtesy I upload to eQSL but if you
use that - also pls upload to LOTW
or hard card.
moderator [EMAIL PROTECTED]
moderator http://groups.yahoo.com/group/DXandTalk
----- Original Message -----
From: "Dave Bernstein" <[EMAIL PROTECTED]>
To: <digitalradio@yahoogroups.com>
Sent: Saturday, March 10, 2007 1:02 AM
Subject: Obstination (was Re: [digitalradio] Re: 3580kHz-3600kHz Freq
Coordination Info)
As is often the case in engineering, Jose, perfect is the enemy of
good. What Rick KN6KB discovered while developing SCAMP's busy
detector was that he could detect CW, PSK, Pactor, and SSB at an ~80%
confidence level without enormous difficulty. SCAMP beta testers were
amazed by the effectiveness of this first iteration.
Pushing the confidence level from 80% to 100%, however, would take
years -- if its even possible. But a busy detector that works 80% of
the time would cut QRM from unattended automated stations (like
WinLink PMBOs) by a factor of 5!
Your comment that "many think it is simpler than it really is to do
it WELL" is frankly moot; Rick demonstrated two years ago that useful
busy frequency detection was implementable on a PC and soundcard.
73,
Dave, AA6YQ
--- In digitalradio@yahoogroups.com, "Jose A. Amador" <[EMAIL PROTECTED]>
wrote:
>
> Then, we need a codesmith that does away with those inaccurate
assertions.
>
> The bona fide attempts of Rick with SCAMP has opened a can of
worms...
> I don't even think he foresaw this, as many think it is simpler
than it
> really is to do it WELL. It is no kids play.
>
> Let's wait for the magic code.
>
> Jose, CO2JA
>
> Dave Bernstein wrote:
> >>>> AA6YQ comments below
> >
> > --- In digitalradio@yahoogroups.com, "Jose A. Amador" <amador@>
> > wrote:
> >
> > Seems I did not make my point. A large portion of Winlinks popping
> > "out of nowhere" is because some H I D D E N (in the skip zone)
> > user has triggered it.
> >
> >>>> That's exactly right, Jose. But if WinLink properly included a
> >>>>
> > busy frequency detector, then it would refrain from responding to
> > that H I D D E N user -- as would a human operator under the same
> > circumstances. But since WinLink doesn't include a busy frequecy
> > detector, and since WinLink doesn't respond to an operator sending
> > "QRL, please QSY", it blasts away, QRMing the pre-existing QSO.
> >
> > Andy, wasn't there another list to discuss this "I hate Winlink"
> > stuff?
> >
> >>>> There is indeed another list for discussing policy. Addressing
> >>>>
> > inaccurate technical assertions seems in-scope for this list.
> >
> > 73,
> >
> > Dave, AA6YQ
>
> __________________________________________
>
> V Conferencia Internacional de Energía Renovable, Ahorro de Energía
y Educación Energética.
> 22 al 25 de mayo de 2007
> Palacio de las Convenciones, Ciudad de la Habana, Cuba
> http://www.cujae.edu.cu/eventos/cier
>
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