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VE2HAR > MT63 10.03.05 05:04l 186 Lines 5493 Bytes #-7498 (0) @ WW
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Subj: [MT63] 20 kHz wide Digital Proposal
Path: DB0FHN<DB0FOR<DB0SIF<DB0EA<DB0RES<ON0AR<VA2HAR<VE2HAR
Sent: 050310/0234z @:VE2HAR.#MTL.QC.CAN.NOAM Laval #:40912 $:4507sentto
OK fascinating Walt, but do explain to me WHY it is that we need
to send so much high speed data on HF?
Wouldn't VHF and satellites do a lot better without ruining things for
the regular CW and phone operators who need their space?
By the way the MT63 signals are 1 kHz wide.
We don't need to keep making wider and wider digital signals
and if the digital audio needs to be 20 kHz wide, what is the point?
Why do hams need to transmit multiple channels of audio all at
once? For an English and Spanish simulcast? :- )
You wrote:
> Brian,
>
> Well yes and no. What the HSMM is suggesting is that you allow up to
> 20 KHz signals. But we're taking about 56KBPs throughput that would
> allow one or more voice channels actually multi-mode all on one
> signal.
>
> You might see 56KBPs data but it would only be on-the-air for a short
> time. The "channel" would be shared.
>
> Right now we have MT63 at 200 WPM thoughput on a 2 KHz wide bandpass
> at a -5 dB SNR on a poor CCIR channel. But we really need to push
> 800-1200 WPM at the same signal level. I don't see doing that with
> less than a 6 KHz channel even exploiting some of the new OFDM type
> modulation protocols being developed.
>
> How many CW QSOs running at 20 WPM will it take to produce 1200 WPM
> error free copy at a signal level that MT63 can copy? These are
> signal levels that even the best CW operator can't copy a signal at.
> So the answer is that NO number of CW QSOs can produce the throughput
> of 1200 BPS, near error free, at a -5 dB SNR on a poor CCIR channel.
>
> All this IS possible if we are willing to step out of the box.
>
> AND the new modes that will develop will be FAR SUPERIOR to Pactor III
> or anything being done today on HF.
>
> We're also looking at doing much of this work using a computer sound
> card so separate controller hardware is not needed.
>
> 73,
>
> Walt DuBose/K5YFW
> Asst Chairman
> ARRL HSMM WG
>
>
> Quoting Brian Carling <bcarling@cfl.rr.com>:
> >
> > On 8 Mar 2005 at 19:11, David J. Ring, Jr. wrote:
> >
> > > I don't think the digital signals they want are 20 kHz wide!
> >
> > Want to bet on that?
> >
> > There IS in fact a proposal out now for a digiotal mode that IS 20
> > kHz wide for high speed data transefer on HF ham bands. (as if
> > Cra... er, I mean Pactor is not jamming the HF bands enough
> > already!)
> >
> > Here it is:
> >
> > On Janauary 19, 2005, John Champa, K8OCL,ARRL Chairman, High Speed
> > Multimedia Networks Working Group, issued the Technology Task Force
> > report to the ARRL Board of Directors, which includes the following:
> >
> > "At a minimum, 20 kHz wide emissions should be allowed in the
> > following segments:
> >
> > 3.58 - 3.725 MHz
> > 7.035 - 7.125 MHz
> > 14.065 - 14.15 MHz
> > 21.08 - 21.2 MHz
> > 29 - 29.7 MHz"
> >
> > Obviously, a *single* HSMM transmission, 20 KHz wide, could
> > totally wipe out all PSK31, MFSK16, RTTY, and many CW and DX
> > operations on 80m, 40m, and 20m, where they are now used
> > worldwide. Dozens of CW QSOS could be obliterated within
> > one 20 kHz swath. NOT a good idea at all!
> >
> > We have never seen such a lack of concern and compassion for the
> > majority of radio amateur activities as evidenced by the ARRL
> > Committee on HSMM and ARRL support for Winlink's attempted
> > domination of the HF frequencies, in both cases, to sacrifice the
> > hobby on HF for everyone else in order to favor a very small special
> > interest group.
> >
> > I can only hope that they really are coming to their senses at the
> > top level of leadership, but this is cause for alarm. JIm Haynie
> > says that they are going to have a new band plan by July. I hope it
> > is a workable one that averyone can live with. The Winlink/Pactor
> > mess will hopefully get reined in by this.
> >
> > OK back to some fun CW contacts now, and a little less grumbling!
> >
> > 73 de AF4K
> >
> >
> >
> >
> > << Try MT63 on 80m - great fun!>>
> >
> > - The MT63 Reflector -
> > MT63@egroups.com
> >
> > (To unsubscribe. send email to
> > MT63-unsubscribe@onelist.com)
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
>
>
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