开云体育

All: It's been since last March that we've made a new source code release and a lot has happened in the interim. First, I doubled the number of Beta testers for the software and that has been invaluable in testing the software, especially since there are some minor hardware differences within the Beta group. A special note of thanks and appreciation goes to Greg (KF5N) who led the Beta effort with notable help from Len (KD0RC), Wes (AC8JF), John (G0ORX), Jack (KC7VLO), Nev (ZL2BNE), and Jerry (KF6VB). Dr. Bill Schmidt (K9HZ) has made numerous hardware additions to the project, including PCB's and a PA kit of his own design. To all of them, a huge thanks! Please note that we are now requiring a micro SD card be in place in the onboard Teensy 4.1 micro SD cardholder. Also, the preferred IDE is now Release 2.1.1. Compiles give two warnings: 1) that the memset() call has overlapping elements (I want it that way), and 2) a warning from the Open_Audio library. I don't want to wade into someone else's library code and make changes since everyone using it in their T41 would have to do the same. Just ignore the warning. Finally, if you do find a bug, post it with the same tag line as seen here. I'm going to "sticky" the post so they stay together. You will find the new code in the Files section. (Go to the File directory, double-click on the right-most column, Update, two times. This will bring the post near the top of the list.) Jack, W8TEE

Al I noticed that the Hilbert filter coefficients in v66-9 don't exhibit the same structure as in v50 where the negative 45 phase shift coefficients are just the reverse order of the positive 45 phase shift coefficients. Can you provide the Hilbert filter design files for v66-9 and v50. Thanks Terrance

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

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

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