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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

Well, after a long, arduous (my opinion!) but enjoyable journey, I finally got on the air. 10 watts, EPA into Southern Louisiana using a home brew 20M vertical dipole, thru 50' of coax. RST of 52 (I'll take that). I really wasn't sure how well my HT mic would work, but apparently it did well. V12, Ver66.9. Plenty of signals booming in, crystal clear. Mostly from down south, but one from CA. Of course most were running 1KW. Thanks everybody for the help that was provided. Mark KU3O

Completed RX and TX IQ cal all working fine. I went into menu to change display options, as soon as menu came up it returned went back to spectrum display which was only partial display. Now it reboots on its own every few seconds and display is only partial. Locked up power cycle does not help. Tim W4YN

I recently did some ADC measurements in preparation for an update to my Audio VNA. I mention it here as I think it has some stuff of interest to the T41 project. The measurements are on-going, but as of now included the SGTL5000 (ADC side)and the PCM1808. I believe it was the T41 use of the PCM1808 that got me to look at that part---thanks. The web page for the study is https://www.janbob.com/electron/Codec/CODECTest.htm For this group, one interesting element that came out is that the PCM1808 produces 24-bit output data, but this is lost back to 16 if you input I2S via the Teensy AudioInputI2S followed by a Q15 to F32 conversion. If you do the input via AudioInputI2S_F32 of the OpenAudio_ArduinoLibrary, the F32 library, it will include all 24-bits automatically, as well as saving a conversion. Questions, comments and corrections are all appreciated. Bob W7PUA

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

Greetings All, I don't see much mentioned lately regarding the MCT, but having recently purchased the 'Microcontroller Projects for Amateur Radio' book (via Amazon); I've decided I would like to build an MCT of my own. I've been a licensed ham since 1971 and would like to take one last(?) crack at CW. I've been searching the web for either a kit, or at the very least a PCB (as mentioned in the book) but so far haven't found anyone (in my hemisphere) currently offering one that goes with the text. I also understand that the gerbers, schematics, source code etc., have been made available in the files section and github. I just thought I'd ask before messing up square feet of perf board, whilst attempting to wire up the pieces-parts. I also considered trying to have a PCB made, but I've only ever done that once. The results were good enough, I simply don't need a handful of boards when one will suffice. :) Sorry for the ramble. Any advice...? Thanks. 73, Vern - N7GTB

I've been wrestling with the datasheet for this 7" display. I checked all the jumpers and it is configured as 4-wire serial. It seems like there is a typo in the datasheet, as they have two J2 connectors, one with 10 pins and the other with 40 pins (labeled Parallel/Serial Interface and CTP (capacitive touch panel) interface. I want to double check if my assumptions are correct in the following connections to the display: Use only the first 8 pins of the 40 pin connector Pin Number (J2 AKA J3 on the device) 1 and 2 VSSGroundGND 3 and 4 VDDPower SupplyVCC 5 /SCS Serial Mode Chip Select (/CS), Low activeC/S 6 SDO 4-wire SPI Data Output (MISO)MISO 7 SDI 4-wire SPI Data Input (MOSI)MOSI 8 SCLK SPI Clock (SCLK)SCLK I've attached the datasheet. Thanks for you help.

Hi everyone. Its been a LONG time since I've done any compiling, so I don't know how to go about understanding the meaning of : undefined reference to. . . Would someone be so kind to enlighten me? Thanks, Duane - K5CA

I put together the BPF board, only three bands, powered up and had no connection between the teensy and computer. Disconnected the board and had connection with computer. Replaced teensy, now on fifth one, put back together and had connection. Teensy can not find the BPF board. I checked and rechecked the solder connections still nothing. Where or what should be looking for? Tom AB9EK

Hi Bill, In the boards that I have received, I noticed that there are 2 different encoder boards. In my first order I received the skinnier board labeled 3428224AP11-230315. In a recent order I received only 2 of the wider board, labeled 3428224A_P56_250122. What is the new board for and why only 2? Sorry if this was already answered, but I couldn't find it mentioned in my search here. Best regards, John K1JO

I have looked at all schematics and construction files, where is the j22 connector on main board connect to?