[FADCA] Transmittal speed

[Stacey & Bob H.]

That answered it. Looks like I will go right to Pactor III. I had heard that
the maximum speed on HF is 300b is that true or is it for some bands?

Thanks

Bob N4WFH

----- Original Message -----
From: "bud thompson" <budt@cfl.rr.com>
To: <fadca@mailman.qth.net>
Sent: Sunday, February 16, 2003 11:17
Subject: Re: [FADCA] Transmittal speed


> Bob:
>
> The HF transfer of the 32K message was done on PacTOR 3.  The link to
WB5KSD
> in Dallas was good and the transmission speed reached an indicated 3200BPS
> for most of the file transfer. PacTOR modes are adaptive and change rates
> depending on throughput/conditions. Once the transfer started, my Airmail
> screen indicated it would take less than one minute. (<1 min)
>
> The upper rates of PacTOR 3 require a 2.4KHz bandwidth. It is a multi-tone
> mode, not just two-tone M/S.
>
> PacTOR 2 can attain up to 800BPS and PacTOR 1 maxes out at 200BPS. Both
are
> only two-tone M/S modes and work within a 500Hz bandwidth.
>
> 3200 is the max rate for PacTOR 3. It steps down from there to 2800, 1400,
> (1200?), 800, 600, 200 - ( think that is the progression) depending on
> conditions.  Most of the PacTOR 3 links on my WL2K are 1400 or greater...
Of
> course I don't know this unless I'm watching which isn't all the time.
After
> almost two months of WL2K operation now, I'd estimate that 15 percent of
the
> P3 transfers are at max speed, 60 percent at the next step down. This is
on
> any band 40,30,20, 17,and 15M where I allow P3 connects.  My regular users
> are at distances from 100 miles to more than 3500 miles.  In January I had
a
> regular user while he took a week or more crossing the Indian Ocean in his
> sailboat, but he was using PacTOR 2.
>
> My stats show that since Jan 1 about 40-45% of the connects are PacTOR 3,
> 35% PacTOR 2 and the rest PacTOR 1.
>
> I assume the rate that is shown on my screen during the transfers is the
> ASCII transfer rate, so the effective throughput would be faster yet
> depending on how much compression is being used. At a 40% compression, a
> 3200 rate would be 1.4x that much effective or nominally 5KB.  I also
assume
> the posted rate is the actual transmission rate which would have to be
> reduced when the effective rate is determined as these are QRQ modes, not
> full duplex.
>
> Of course the 80 seconds on my transfer to Dallas  included all the
> systematic overhead as well.
>
> Rick KN6KB can weigh in here to straighten out any kinks I just made.
>
> bud
>
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> ----- Original Message -----
> From: "Stacey & Bob H." <stacey.bob@gte.net>
> To: <fadca@mailman.qth.net>
> Sent: Sunday, February 16, 2003 09:49
> Subject: [FADCA] Transmittal speed
>
>
> > Bud Wrote:
> >
> > Yesterday I sent a ham-to-e-mail message with two attachments. One was
an
> MS
> > Word file (a 30K binary file), the other a small DOS.txt file. The
actual
> > text in the e-mail message was only a reference to the testing. The
total
> > e-mail message was just over 32Kbytes. From my home Airmail set up in
> > Deltona on 20M I linked with WB5KSD, a frequency/band scanning WL2K
> station
> > near Dallas, TX. I got lucky and made the link in about 15 seconds - it
> > would have taken 45 seconds had I missed his scanning the frequency the
> > first time. Once linked the entire 32K message was sent and we were
> > disconnected in about 80 seconds. I then walked across the shack about
10
> > ft to my XYL's computer and the e-mail message was in her in folder.
> >
> > Bob: Bud at what baud rate did you pass a 32k file in 80sec? At 1200
baud
> it
> > would approximately 9 minutes.
> >
> > Bob N4WFH
> >
> >
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>
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