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I am working on a 3d printed mic case, still needs some tweaking. Not my design (above my pay grade) but I think I can make a few tweaks to STL files. Tim

In the spirit of posting efforts currently underway, I have been working on a new RF board and associated driver software. In a nutshell, the new board uses the Skyworks SI5340 instead of the SI5351. This change addresses several issues. The SI5340 offers rock solid performance from 100 KHz to 250 MHz with LVCMOS outputs (employed by the prototype RF board), dramatically reduced phase noise and jitter, much improved clock symmetry (upon which the performance of Tayloe mixers depends), and much simpler application-level control software (no mucking about with the PLL, Multisynth, or phase at the application level). The new RF board replaces the 5351 with the 5340, and restores true split operation (the SI5340 has four outputs, three of which are used for RX, TX, and CWTx). The most challenging part of the software was the algorithm for setting output frequency, that is, given a desired frequency, find near-optimal numerator and denominator values for the various dividers used within the SI5340. My software employs a mediant-based algorithm attributed (incorrectly) to Farey, and efficiently produces results comparable to those produced by ClockBuilder Pro (the stand-alone program for configuring Skyworks parts). Current status: 1) Driver and driver example code complete and tested with main board and SI5340 EVB 2) T41 software (forked from V66.9) patched to ifdef choice of SI5340 or SI5351 RF Board compiling and in test 3) New RF board hardware under construction (PCBs back from China; parts on hand) For the curious, prototype schematic and board pic are attached. 73, John Bennett AE0AM

Can anyone tell me if the changes made regarding the MF frequencies are documented anywhere? Were changes made in the BOMs or assembly manuals for the affected boards? I have been unable to find them. Thanks. Dave. W0DF

After learning that Hans Summers was at Dayton Hamvention promoting his QMX which can now operate SSB using Polar Modulation, this got me thinking. Has anyone considered a T41 using Polar Modulation? How difficult would the software be to implement? I am sure I can sort the hardware side of things. John, G0SDF

By way of https://makezine.com/products/boards/m5stack-dial/ I was just looking at this https://shop.m5stack.com/products/m5stack-dial-v1-1 With my limited programming skills it would be a coin toss if it ended up on the shelf of shame or in something useful but in the right hands this could be interesting, assuming it isn't too noisy.

The T41 Information site is live at https://t41sdrtransceiver.wordpress.com and we are getting a lot of traffic. So far, just since yesterday at noon, we have gotten over 400 visits and more than 1200 page views. I just added a new photo gallery of images gleaned from this site and other places. If you want to have your rig featured on the User page, send me a photo and short paragraph describing your experience. Send to albertfpeter@... Thanks, Al

The yellow LED next to the reset button on the Teensy board lights up brightly and dimly. And the audio is pumping most strongly on bands 17 and 15 at the same time. What's the problem? Only the main-board and the RF-board (equipped with a TX only) are connected. Regards, Wolfgang

Hi everyone. We have a radio club where I work. Last year we purchased a T41 kit from AI6YM. I understand it have v50.2 firmware on it. When trying to follow the Receive IQ calibration, from the latest T41 book (updated for v12 boards), we noticed that the menu is missing some functions and the display is messed up. Is the book written for v66.9 firmware? Here is what the display looks like. Thanks , Duane - K5CA

Could the FT8 mode also be integrated into the T41? It would also be nice if there was a way to set the time. Best regards, Wolfgang