I don't know if this info is much use but Skysweep Technologies bundle an
OFDM (TX RX) mode with their SkySweeper 5.12 package.
http://www.skysweep.com/skysweep.html
The mode is called SkyOFDM and from their help file:
SkyOFDM is a state of art high speed modem based on the OFDM and turbo
Could a
higher higher success rate without the fill requests be achieved with
some combination of better FEC, slower data rate, better spreading of
the data over frequency and/or time?
Try it. It's all there.
FEC, data spreading and data rate can be selected in DRM, read the doc.
Easypal
When I am camping in the south of Spain through the winter, every sunday
morning
our 30m pskmail link to Sweden is covered up by splatter from french SSB
stations.
Pskmail makes use of the gaps in the conversation (there are weak and strong
stations
in the round) and delivers the information.
Rein PA0R wrote
When I am camping in the south of Spain through the winter,
every sunday morning our our 30m pskmail link to Sweden
is covered up by splatter from french SSB stations.
Pskmail makes use of the gaps in the conversation
Hi Rein,
I am curious about the splatter.
Normally,
Rein PA0R wrote
When I am camping in the south of Spain through the winter,
every sunday morning our our 30m pskmail link to Sweden
is covered up by splatter from french SSB stations.
Pskmail makes use of the gaps in the conversation
Hi Rein,
I am curious about the splatter.
The recent RTTY contest leads one to ponder:
Why don't we see much backlash against contests?
By orders of magnitude, contests create more QRM
than any other cause on ham radio. They commonly
render multiple ham bands nearly unusable for
normal communications, for several days at a time.
Bonnie , this is essentially a repeat of your point from several months
ago. It is essentially trolling. I will close this topic.
Andy
K3UK
On 10/22/07, expeditionradio [EMAIL PROTECTED] wrote:
The recent RTTY contest leads one to ponder:
Why don't we see much backlash against contests?
--- expeditionradio [EMAIL PROTECTED] wrote:
The recent RTTY contest leads one to ponder:
Why don't we see much backlash against contests?
By orders of magnitude, contests create more QRM
than any other cause on ham radio. They commonly
render multiple ham bands nearly unusable for
Hi Bonnie,
You are absolutely right. The only time i really have to do some DX is on
weekends but nearly always I'm confronted with the whole bands occupied by
contests. This weekend, there was a RTTY contest taking all the digi bands and
at least one on SSB so all my DX interests (SSB and
Who showed up first?
I believe that on the light of the previous discussions, PJ2/WK4Y came
first, he should not have been QRM'd with PSK, MFSK or whatever, and all
activity should have stopped until that spectrum chunk was cleared, as
SSB is authorized on those frequencies in this part of
Luc,
Guess what? Contesters work during the week too. Many have weekends
only for radio. So you get them engaged in their favorite activity on
weekends. Why is this hard to understand?
They don't complain about the QRM but rather accept it as a challenge
to overcome. I suspect this is also
Look at KA9Q's web site, especially http://www.ka9q.net/code/fec/, for FEC
software.
73,
John
KD6OZH
- Original Message -
From: Rud Merriam
To: digitalradio@yahoogroups.com
Sent: Monday, October 22, 2007 05:13 UTC
Subject: RE: [digitalradio] Re: OFDM Proposal
Ed,
I
expeditionradio wrote:
The recent RTTY contest leads one to ponder: Why don't we see much
backlash against contests?
More flame bait.
de Roger W6VZV
OFDM is used by a number of programs as Ed mentions, but isn't this also
the prime basis for many of our sound card modes? And Pactor 3?
Most of the items mentioned below have been done or are currently used
technology. One glaring exception is the lack of a narrow ARQ mode for
keyboard that
Clearly, the 7070 watering hole is used 24/7 by narrow PSK31 stations as
long as the band is open. The contester can unfortunately use SSB voice
in that part of the band. He may not have known or cared that this is
about the hottest digital area on 40 meters, but of course the PSK31
stations
The inputs to the FFT for each subcarrier are the sine and cosine of the phase
of the signal. This is usually done in a lookup table. However, you're right
that a FFT is inefficient for 9 subcarriers. Each could be generated by an
accumulator and a sine/cosine lookup table. The input to the
I want to point out that 7070 and the surrounds are part of the phone
band in Europe and elsewhere(e.g. Canada). It has been that way
long before any of these digital modes existed. It isn't just
contests. It is a very popular spot day in and day out. The BC
stations in EU from 7100 up make
Hi all,
Thank you all for your reports. The response has been overwhelming.
Special thanks to
those of you that have had the grabber's going on the net. It has been
amazing to see my
low power signal crawling over the screens.
The beacon will be off for a while, but it will be back. Maybe in
18 matches
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