Hi Rud.
I do not know any program, that introduces errors into bit stream for
protocol tuning purposes. For tuning the decoders in PocketDigi, I
used Moe's WSCGen, which generates test streams of various levels of AWGN.
http://www.moetronix.com/ae4jy/projects.htm
It is not valid to simulate
http://forums.ham-radio.ch/archive/index.php?t-3399.html
here is a link to a discussion a year ago. 2006. seems like the command
set is open but the interfacing code is alot of work for the RixExpert
On 11/5/07, Rem Roberti [EMAIL PROTECTED] wrote:
Has anyone had any success using a USB
I believe that if you are licensed by the fcc, you must obey fcc rules
and regulations when operating in international waters. Only when you
reach national waters do foreign rules and regs come into play.
Jim
WA0LYK
--- In digitalradio@yahoogroups.com, Russell Hltn [EMAIL PROTECTED]
wrote:
On
Looks to me like it should be operating on 28.20–28.30 MHz according
to 97.203d. Also, if the balloons path goes over the National Radio
Quiet Zone, 97.203(e)/97.3(a)(30) it looks like permission is supposed
to be obtained. Lastly, does foreign operation come into play and the
need for
TNX for the info.
I think you should post the message again when the baloon is on it's
way. Or just a reminder so i wont forget to listen-in.
I think it's a very intresting experiment lasting only a few days.
So i personally dont understand the attitude of interpreting the
national us band
Hi Rud,
I just sent you the Pascal source code for generating and receiving OFDM via
wav files. There is also a simple program that will modify a file to simulate
multipath by converting it into multiple rays.
I agree with Vojtech that it's not very useful to flip bits for testing as any
I understand about the use of soft decoders.
If the protocol uses a soft decoder and another hard decoder the latter
works at the bit level. A standard example is using Reed-Solomon for the
hard decoder. Would the bit flipping be representative of the atmospheric
effects for the outer hard
If you have an inner and outer code that would be the situation, but I'm not
sure that flipping one bit would always be accurate. A Viterbi decoder might
generate small bursts of errors. HDTV uses TCM with an outer Reed-Solomon code.
Even though there are 12 interleaved convolutional encoders,
I believe it falls, jurisdictionwise, in the same case as a satellite.
It must be licensed by some administration, and also, do not
violate the spectrum boundaries of others under it.
That is cleat on the satellite bands, but not so in HF, in a non
satellite activity allocated band.
Jose,
Russell Hltn wrote:
I personally have nothing against them, but they do need to follow the
law. One would think the space program would have settled all of
these questions already.
Legally, it is not a spacecraft because it is less than
50 km high.
Rick N6RK
On Nov 6, 2007 5:02 AM, cesco12342000 [EMAIL PROTECTED] wrote:
I think it's a very intresting experiment lasting only a few days.
So i personally dont understand the attitude of interpreting the
national us band regulations against it...
If it's not done right it sets a bad precedent.
I
That's right. I was only referring to the radio aspects, and did not
account
for that thing classifying as an aircraft. It may easily become a
navigation
hazard.
Complicated, and ugly indeed...
Jose, CO2JA
---
John B. Stephensen escribió:
Anything less than 50 km in altitude is an
I have posted this on the mailing list of Icelandic Radio Amateur
club. Hopefully someone there might have an interest.
73 de TF3AO Seli
--- In digitalradio@yahoogroups.com, Mark Thompson [EMAIL PROTECTED] wrote:
- Forwarded Message
From: John [EMAIL PROTECTED]
Sent: Monday,
On Nov 6, 2007 3:07 PM, Jose Amador [EMAIL PROTECTED] wrote:
That's right. I was only referring to the radio aspects, and did not
account
for that thing classifying as an aircraft. It may easily become a
navigation
hazard.
Complicated, and ugly indeed...
There are standard protocols for
In addition, if you have a systematic code versus convolutional or trellis
encoding is the bit flipping not applicable? One of my other research
activities is on Low Density Parity Codes since they approach channel
capacity better than other codes.
Rud Merriam K5RUD
ARES AEC Montgomery County,
Please join us November 10th utc to 11th 2400utc for 30 Meter
Digital QRP Weekend to promote 30m PSK 10.140 +/-1000 and other digital
modes (MFSK,OLIVIA,HELL,RTTY,etc wider modes 10.135 to 10.142) This is
NOT a contest but a group event to promote 30 meter digital activity
and awareness:
Convolutional or trellis codes work by forcing specific sequences of state
transitions and detecting errors when those transitions don't happen. Once the
decoder makes an error it could take several symbols get get back into
synchronization with the transmitter. If you mean the systematic
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