[hfsig] What can you do with an OFDM signal in a 3.5 KHz band pass?
DuBose Walt Civ AETC CONS/LGCA
Walt.DuBose at RANDOLPH.AF.MIL
Mon Aug 22 09:27:52 CDT 2005
Its interesting to do a Google Search on STANAG
Also see http://www.linuxjournal.com/comment/reply/6299 "Radio E-mail in
West Africa: The Complete Version"...remote networking with high-frequency
(HF) radio and qmail.
Perhaps the "system" we are looking for is already in place.
From: hfsig-bounces at lists.tapr.org
[mailto:hfsig-bounces at lists.tapr.org]On Behalf Of Trevor AKA
Sent: Sunday, August 21, 2005 6:42 AM
To: TAPR HF Modes SIG Mailing List
Subject: RE: [hfsig] What can you do with an OFDM signal in a 3.5 KHz
Raw data rates of up to 12800 kbps have available commercially for a number
years now using standard HF SSB rigs. There are several products available
using MIL-STD-188-110B waveforms an example is
Sure they drop down to lower speed if the path isn't great, but on many
the higher rates are viable.
However, I am not aware of any Amateur implementation of these waveforms,
anybody tried ? For some of our HF bands I believe there are valid arguments
for resticting b/w to 1.8 kHz or less but for 28 MHz there is no reason why
kHz or 7.5 kHz shouldn't be used.
73 Trevor M5AKA
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--- tattje <tattje at planet.nl> wrote:
> RE: [hfsig] What can you do with an OFDM signal in a 3.5 KHz bandpass?The
> POTS will give you 56 kbit/sec in the same bandwidth.
> Using OFDM some channels will not be available, fec is not enough, so one
> has to spread the info over all the channels.
> Reread the fs-1052, why do you think are so many different throughput
> 10 kbits in 3 kHz? Forget it, may be sometimes, but not always.
> HF is a naughty channel,
> -----Oorspronkelijk bericht-----
> Van: hfsig-bounces at lists.tapr.org
> [mailto:hfsig-bounces at lists.tapr.org]Namens DuBose Walt Civ AETC CONS/LGCA
> Verzonden: vrijdag 19 augustus 2005 22:25
> Aan: 'TAPR HF Modes SIG Mailing List'
> Onderwerp: RE: [hfsig] What can you do with an OFDM signal in a 3.5 KHz
> band pass?
> When talking to EOC, disaster relief and military contingency personnel
> about HF data modes, they no longer ask how many words per minute is it,
> they are asking how many pages per minute is your capability.
> We can no longer think in WPM capability; but rather, pages per minute
> -----Original Message-----
> From: hfsig-bounces at lists.tapr.org
[mailto:hfsig-bounces at lists.tapr.org]On
> Behalf Of DuBose Walt Civ AETC CONS/LGCA
> Sent: Friday, August 19, 2005 2:41 PM
> To: 'hfsig at lists.tapr.org'
> Subject: [hfsig] What can you do with an OFDM signal in a 3.5 KHz
> What can you do (what RAW throughput) can you get in a 3.5 Khz bandwidth
> using an OFDM mode?
> Here's what I found using some figures based on the FS-1052, Appendix A
> Your User Throughput will be determined on how much RAW througput you
> for FEC.
> > _______________________________________________
> hfsig mailing list
> hfsig at lists.tapr.org
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