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New Members: Please read
There are a lot of messages from new members asking questions that have been answered previously in this site's Wiki posts. Redundant messages chew up our allotted disk space faster than it should, which increases the cost of maintaining this site. My hope is that by reading the Wiki first, new members will find answers to commonly asked questions. -- Jack, W8TEE Amin -- Jack, W8TEE
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T41 Source Code Release SDTVer049
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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
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MF changes
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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
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T41 LPF Options
There is quite a difference in price in the Log Amp Detector and Diode Detector options. Before I chose the cheaper route, what is the performance difference I will see in the display and are both options now supported and selectable in the software? Also, the same question for the Digital Power report and the analog Power report options, what is the performance difference I will see in the display and are both options now supported and selectable in the software? Thanks, Jerry N KD4TNX
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T41 Hilbert Filter Design
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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
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Strange 15 happenings
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I was having fun working DX on 20 and 17M's today. Saw activity on 15, made a few calls noticed output in SSB was low. SWR was perfect (Steppir) so I decided to play with TX attenuation. Changed from 5 to 1. Display went wonkey on TX. Switched to CW and it stayed in CW after key up. Went back 20m's all good, same with 17. Back to 15 and same conditions, ran out of time so I did not reboot and start over. Did see anything weird when doing TX calibration. Will do more testing tomorrow. Tim W4YN
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New SI5340-based RF Board in development
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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
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T41 with Polar Modulation
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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
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LPF question
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The BOM for the LPF Filter board lists all of the caps as 200V but the schematic shows 100V. The 200V and higher caps are almost non existent on Mouser or DigiKey and the few values there are $1.00+ each. Are 100V parts acceptable for 100W? -- 73 to you! 73 Bob W3RDL Virus-free.www.avast.com
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M5Stack Dial - ESP32-S3 Smart Rotary Knob
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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.
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Problem running Arduino on Linux under Kubuntu / Ubuntu
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Somethings changed with a recent Ubuntu update. I tried launching the Arduino AppImage and got this: ./arduino-ide_2.3.6_Linux_64bit.AppImage [13415:0522/155036.803945:FATAL:setuid_sandbox_host.cc(158)] The SUID sandbox helper binary was found, bu t is not configured correctly. Rather than run without sandboxing I'm aborting now. You need to make sure that /tmp/.mount_arduinIn8mwB/chrome-sandbox is owned by root and has mode 4755. Trace/breakpoint trap (core dumped) Anyone else seen this and have a fix?
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Muddy Audio
I should clarify that the "muddy audio" problem is not new with this version. The last version I was using had it also. - Jerry, KF6VB
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T41 Web site update
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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
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New T41 Site Available
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Hi Everyone, I have created, with Jack's help, a new site all about the T41-EP at: https://t41sdrtransceiver.wordpress.com This is an 'information and background site" for the T41, not an open forum - the SCHR (this site) is the place for posting comments/suggestions about the T41. I intend to post lots of photos of user-built T41 rigs. I have a few already included, but would like more. If I get enough, I will create a separate gallery page of just T41 builds. Photos should be sent to me directly at albertfpeter@... with a brief explanation. I reserve the right to edit any comments for brevity. Let me know what you think. Regards, Al Peter AC8GY
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Help: Audio is pumping on bands 17 and 15.
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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
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T41 from AI6YM
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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
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Digital Mod FT8
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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
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T41 Books for sale - signed copies Latest version
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After HamVention, we have a few signed copies of the latest version left over. We are offering them for the HamVention price of $40.00 + USA shipping of $8 for USPS media rate. (a bit slower, but lots cheaper). Note: Amazon sells the non-signed copies for $5 more. Outside the US, international shipping rates apply. If you want one, please: Send a private note to me with your name, address and how you would like the book personalized (Name & Call) This will verify that we still have copies. I will reply with mailing information Then send a check for $48.00 to me at the address specified in the reply. We have limited quantities, so first come, first served. We sold a bunch at FDIM and Hamvention, but some still remain. Al AC8GY
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JLCPCB Price Increase
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Was curious tonight as to whether the China tariff situation was going to affect prices. The cost for 5 PCBs from JLCPCB went from $2 to $4; not that big a deal. Don't know about other fabricators. -- John P. WA2FZW
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T41 Books for sale - All gone!
I am down to just one book, so I will probably cut off the offer at this time. Sorry anyone missed out. Thanks very much to those who replied. Regards, Al AC8GY
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