| |
VE2HAR > MT63 11.03.05 14:04l 52 Lines 1613 Bytes #-7493 (0) @ WW
BID : 11231SENTTO
Read: GUEST
Subj: Re: [MT63] 20 kHz wide Digital Proposal (Was: ARRL MUST GET
Path: DB0FHN<DB0THA<DB0ERF<DB0FBB<DB0IUZ<DB0GOS<DB0EEO<DB0RES<ON0AR<VA2HAR<
VE2HAR
Sent: 050311/1130z @:VE2HAR.#MTL.QC.CAN.NOAM Laval #:41305 $:11231sentto
On Thu, 10 Mar 2005, David Willmore wrote:
> So, MT63 (63 carriers of BPSK and heavy FEC) in a 1KHz BW at -5db (in
> the same BW?) SNR competing with a similar signal in 6KHz of BW will be
> -12.8db SNR (in a 6KHz BW). Do you expect to be able to decode that?
>
> What I'm getting at is that adding bandwidth isn't a wonderful solution
> to your problems.
Please remember that you *can* trade power for bandwidth. That's what
Shannon said over 50 years ago and most hams don't get today. You can get
a given amount of information through with less power if you increase the
bandwidth (ie. add redundancy: fec). Of course HF makes the situation much
more "interesting" but it's basically still true.
Of course, more information needs more power if everything else is kept
constant, so I'm not saying 56kbps is very feasible on HF...
--
Tomi Manninen / OH2BNS / KP20JF74
------------------------ Yahoo! Groups Sponsor --------------------~-->
Listen to Internet Radio! Access to your favorite Artists!
Click to listen to LAUNCHcast now!
http://us.click.yahoo.com/_mKGzA/GARHAA/kkyPAA/CPMolB/TM
--------------------------------------------------------------------~->
<< Try MT63 on 80m - great fun!>>
- The MT63 Reflector -
MT63@egroups.com
(To unsubscribe. send email to
MT63-unsubscribe@onelist.com)
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/MT63/
<*> To unsubscribe from this group, send an email to:
MT63-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
Read previous mail | Read next mail
| |
