Hi John -- congrats on your group's initiative and success with this ambitious project. While it looks like you've mined the wsjt-x development email alias for interest, there are at least a couple of other groups that might also have an interest in coming up with a common way to do this:
1) The QRP-labs https://qrp-labs.com folks that support Youngster on the Air activities (yota.org) with kits like the QCX qrp transceiver; perhaps FT8 would be a mode that he'd support with a future kit's release firmware, in which case he'd need this too. Interpreting UDP packets might be 'heavy' for use by the CPUs that are in many of his kits, but serial should be possible. The very popular Ultimate3s beacon kit has the HW capability to generate tones like this (si5351), and that kit already has a receiver add-on. Someone would have to be clever with firmware and some sort of interface to wsjtx. 2) Some hams are trying to get the uBitX semi-kits on the air on FT8 -- doing this with an all-digital tx path might be interesting to some of those folks. I'd personally appreciate if you'd continue to keep this email list updated on your group's progress! -Brian N9ADG On Sat, Feb 9, 2019 at 7:21 AM John Langner WB2OSZ <wb2...@comcast.net> wrote: > > A local group is designing a homebrew transceiver as a group project. > One > of the requirements is the ability to transmit WSJT-X modes. It will not > have SSB transmit so we can't use the usual transmit audio signal. > Instead > we will be driving a direct digital synthesis (DDS) chip to generate the RF > directly. > > We already have a proof of concept working with a Raspberry Pi and a DDS > eval board. A modified version of WSJT-X generates a UDP packet at the > beginning of each transmission. This contains information such as the > lowest tone, tone spacing, time for each symbol, and a list of symbol > values. A separate converter listens for the UDP packet, parses the > content, and commands the DDS chip to generate the different frequencies > with the correct timing. > > A quick search of the wsjt-devel archives reveals that others have been > interested in a similar capability. > > https://sourceforge.net/p/wsjt/mailman/message/33465468/ > https://sourceforge.net/p/wsjt/mailman/message/32575984/ > https://sourceforge.net/p/wsjt/mailman/message/36416210/ > > This is what we have so far: https://github.com/wb2osz/technightradio > > > Eventually we would like to get this capability into the official releasen > so we don't always have to use our own hacked version of WSJT-X. This > would also be useful to other people. A frequency agile WSPR beacon > transmitter could be built for a very low cost. > > The current modifications are not ready to be added to the official WSJT-X > release. It spits out debug messages and there are still a few details to > work out. At this point, we would just like to get the conversation > started and get feedback from others. After some discussion, and more > refinement of the code modifications, we will submit a final version for > your consideration. > > 73, > John WB2OSZ > > > > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel >
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