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VE2HAR > MT63 10.03.05 17:56l 223 Lines 5988 Bytes #-7496 (0) @ WW
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Subj: Re: [MT63] 20 kHz wide Digital Proposal (Was: ARRL MUST GET
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The truth is that in a 20 KHz channel, I think you could run 8-10 10 KHz wide
OFDM QSOs and not QRM each other AND perhaps run 2 or 3 digital voice channles
IF they were running a similar OFDM type modem.
At this point, the channel and modulation is acting like spread spectrum.
There are several on this list who have sated that they can have an MT63 QSO
in the middle of a SSB QSO. ALso, some have reported that they can/have run 2
or 3 MT63 QSOs all on he basic same channel.
Walt/K5YFW
Quoting Larry Levesque <ka1vgm@levektronix.com>:
> Yes, but imagine 10 people tring to use this mode at once on one band. Not
>
> enough band left for anyone else. If you can specify one channel, I'd say
>
> thow it in the cw allocation!
>
> ----- Original Message -----
> From: <dubose@texas.net>
> To: <bcarling@cfl.rr.com>
> Cc: <cw@mailman.qth.net>; <DCBOATANCHORS@topica.com>;
> <flboatanchors@yahoogroups.com>; <hamradioam@topica.com>;
> <MOPAGROUP@yahoogroups.com>; <MT63@yahoogroups.com>; <linlink@wetnet.net>
> Sent: Wednesday, March 09, 2005 11:35 AM
> Subject: Re: [MT63] 20 kHz wide Digital Proposal (Was: ARRL MUST GET
> BETTER)
>
>
> >
> > 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
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> >
> >
> >
> >
> >
> > << 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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