Hello! Patch now works for FT4 and FT8 with WSJTX 2.1.2, I am finalizing documentation and doing some more testing. There are three Fortran files changed, so only jt9 needs to be recompiled. As I am on Linux, I can not compile Windows version.
I would kindly ask if somebody can compile jt9.exe, so I can include it? K3 with two RX/IC-7610 owners preferred, so they can test it as well. Personal E-mail, please. Best 73, gl Iztok, S52D On 02/01/2019 06:45 AM, Iztok Saje wrote:
Hello! Following some discussion on this forum, where I was too noisy, make me think. When joining two uncorrelated FT8 frames (taken on exactly same frequency, but not at the same time) main problem is how to synchronize all tones? My solution is to shift frames 7 times and do decoding after each shift, thus every tone get summed up in phase (or close enough). CPU load is few times higher as with standard decoder, but my I7 CPU can do it on time. Testing in 1.9.1 gave me excellent results: I made several QSOs where plain FT8 decoder would fail. Source code for WSJTX 2.0.0 with more detailed description is now tested a bit and available at http://lea.hamradio.si/~s52d/ft8div page. You have to compile it yourself. Time diversity (also called incremental redundancy) works by combining two consecutive even/odd frames, good to take repeated messages out of the QRM/QRN. Space diversity (called stereo diversity by W8JI) works when twp copies of WSJTX are run with phase synchronuos RX like K3, IC-7610 etc. Bursts from two RX/antennas are combined. Data is exchanged using temporary files, so both WSJTX copies need separate configuration file. IMHO this approach is worth to be considered to be included in one of the future releases. Best 73, mni DX, CU Iztok, S52D
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