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VE2HAR > MT63 10.03.05 21:03l 104 Lines 2800 Bytes #-7673 (0) @ WW
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Read: GUEST
Subj: Re: [MT63] 20 kHz wide Digital Proposal
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Truthfully I don't know how this will all play out...
Quoting "Curt, WE7U" <archer@eskimo.com>:
> On Thu, 10 Mar 2005 dubose@texas.net wrote:
>
> > Quoting Brian Carling <bcarling@cfl.rr.com>:
> > >
> > > Why do hams need to transmit multiple channels of audio all at
> > > once? For an English and Spanish simulcast? :- )
> >
How about English and French for Canada's use...or English, Spanish, French,
German, Italian, etc. for EU's use?
> > No...not the same station but you can pur multiple digital signals in the
> same
> > channel space.
But that too. We might have 248 carrier tones and QAM-64 on each tone. But
also several stations sharing the same channel. Something like an IRC chat
channel...you could switch from one channel to the next...one might the a
national channel, and others state channels and others local channels...or a
state net and each disastger district having its own data channel and you just
switch between channels to pass traffic.
>
> He may have been asking about multiple digital tones on one audio
> channel, not sure. If that's the question, this allows:
See above.
>
> *) Sending of higher data rates than a two-tone combo would.
>
Yep...will call for more bandwidth than 3 KHz if you want to go over 300-400
WPM at a low signal level
> *) Sending redundant data to help overcome errors without
> requiring retransmissions.
>
Yes...this also, its called interleaving.
> *) Use of frequency diversity to help overcome fading problems.
That too.
>
> *) Tuning the transmission to band conditions, by adjusting the data
> rate/number of tones in order to keep the bit error rate low.
>
Yes...another "trick" to recover the signals and get error free copy at
low/weak signal levels.
Walt/K5YFW
> --
> Curt, WE7U. APRS Client Comparisons: http://www.eskimo.com/~archer
> "Lotto: A tax on people who are bad at math." -- unknown
> "Windows: Microsoft's tax on computer illiterates." -- WE7U
> "The world DOES revolve around me: I picked the coordinate system!"
>
>
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