Hi Markus, Uuuh, chatting with max. 5 characters will become difficult i think :-) As in JT-9, there should be 13 characters, so one can at least write "i have a cat"... :-) Well, what does one need
Thanks Paul, for devising this experiment in the first place, and encouraging me to take part in it. It looks like we are now getting real close to the ultimate Shannon limit, making best use of your
Paul, Am 18.05.2014 14:48, schrieb Paul Nicholson: This is possibly the strongest forward error correction code ever transmitted by a radio amateur. In combination with coherent signalling and Viterb
No it is first necessary to be able to see the carrier at the receiver - in some sufficiently narrow bandwidth. Once the carrier is measured, a symbol period can be chosen which will send a message a
Well done Markus and Paul. Most impressive! 73 & Congrats Joe VO1NA Another successful test by Markus DF6NM this morning, 2014-05-18. Sending 100 bits at 8270.000 Hz using a rate 1/8 convolutional co
Thanks. I am enjoying this foray into FEC and learning something new. It is fun to push some boundaries. When I first picked up a VLF signal from Markus (Oct 2010) I would not have thought that a few
Hello Paul, Markus, Well done! Interesting stuff. I see you never stop to find some new things to try :-) Well well, i should think about... What was the contest of the message? A complete callsign,
Stefan, yes, you guessed right, the message content was indeed "DF6NM" ;-) Let me cite from a recent direct mail to Paul: foreseeing a possible "official first" demonstration. Maybe a truely random m
Surely the concept is not limited to five-letter words. The current encoder implementation on Paul's website takes up to 50 characters, so you can announce a whole litter of kittens including their n
The coding itself imposes no limit to the number of bits to send, but the availability of a steady channel does. The previous weekend Markus made a long carrier transmission and after the terminator
Hi Paul, Am 12.05.2014 18:45, schrieb Paul Nicholson: The signal from Markus is perfect for these tests - very stable, and also quite weak at this range - ideal for tests of coherent modulation with
Is the antenna current stable? Then probably the short-term phase is steady enough. Your transmission on 2012-12-15 was upset by 'RF' getting into your 10kHz reference but I think you got that fixed.
I completed some trials with rate 1/8 K=25 and it works very well indeed. I use 15 second symbols and a near-field source set to the give same flux density at the rx as the signal from DF6NM. The res
Another successful test by Markus DF6NM this morning, 2014-05-18. Sending 100 bits at 8270.000 Hz using a rate 1/8 convolutional code with constraint length 25. The data rate was 24.2 bits per hour a
I am pleased to report reception of two test transmissions from DF6NM on 8270.000 Hz which took place on Saturday 2014-05-10 morning. Markus was sending coherent BPSK with UT synchronous symbols usin
