Two of the clever aspects of FT8 are its source encoding and the application of LDPC forward error correction while maintaining a very narrow audio bandwidth that allows many FT8 signals to coexist wi

#FST4

Curious: Why do the four-tones LDPC modes FT4 and FST4 (but not FST4W) have the source scrambled before adding the CRC and parity, whereas the other modes, FT8 and MSK144 don't? I can't see any obviou

#FST4

05/18/2022 13:12 UTC. No more testing today. KN4FLO, 73.

#FST4

Paul I echo Bob's thanks for your contribution to WSJT-X. Coming from physics and with a high-level understanding of information theory, I appreciate the amazing achievements here. I especially was th

#FST4 #WSPR

Just curious: Why is the compacted data for FST4 scrambled whereas the other LDPC modes FT4/8 and MSK144 are not? The latters' compressed data conveniently appears directly in the symbols. Andy www.g4

#FST4

Hi Rob, see the WSJT-X User Guide for information on the extra information appended to decoded message lines: https://physics.princeton.edu/pulsar/k1jt/wsjtx-doc/wsjtx-main-2.5.1.html#DECODER_NOTES Al

#FST4

Of course. Thanks, Bill, both for your quick reply and your patience! 73, Joe N0NOW

#FST4

Peter, The SAC PC-1000 autocoupler is the real prize in my 630 meter station. My transmitter is a SAC SS-250C with only 25 watts output and the EIRP is estimated somewhere between 20 dbm and 26 dbm, s

#FST4 #FST4W

In FST4, when using plain text or telemetry modes , ie. those without any known structure to the message and not necessarily part of a formulaic contact, is any use made of a-priori information gleane

#FST4

A brief update on progress. PIC code for the later generation enhanced device, the 16F1827, now exists that will turn 13 characters of Plain text, or 17.75 Hex characters into a set of symbols ready t

#FST4

This is really cool, neat to see this on a PIC! 73, Willie N1JBJ

#FST4

sri, meant thanks Bill and Joe :-)

#FST4

I am translating the v2.3.1 User Guide. In section 17.2.10, Table 7 quotes the FST4-15 Keying rate (Baud) to 16.67 baud, whilst the Bandwidth is quoted as 67.6 Hz. Should that be (16.67 x 4 =) 66.7 Hz

#FST4

Thanks for version 2.4.0-rc3. In the v2.4.0-rc3 User Guide, the illustration of section 10.1.5 Mode Menu shows the v2.3.0 Mode Menu, including QRA64 and ISCAT, both to be deprecated in v2.4.0. I guess

#mainscreen #FST4 #Q65

Joe, anyone can do that very easily. Just reset and export the whole list. Note we do not do what you suggest because we need the ability to remove frequencies as well as add them. 73 Bill G4WJS.

#FST4