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Good question… the TX attenuator should work the same way… so either there is a bug in the software… or there is a problem with the MCP23017. Since the RX side works I think its probably a bug

V12.6 RF board. 'Menu/RF Set/RF in Atten' works fine, I get the appropriate 3.3v at pins 21 - 26 as adjustments are made. But 'RF Out Atten' doesn't work the same. I don't see any voltage on pins 1 -

The book has that and I believe that the web site also has instructions on installing the Arduino IDE, the TeensyDuino, and the necessary libraries. Jack, W8TEE

Yeah Jerry. Dave, W0DF

It wouldn't take much to make the software "standalone". That is - being able to distribute it as a binary/hex file instead of making everybody compile the source. I believe that all that would be

Oliver et al, I second the need for a step by step guide of what software to use, where and? to use it.? I am not a software person at all and in all honesty I don't know where to begin with the

Hi Jerry, I posted the measurement I used to prove that U8 was bad here: /g/SoftwareControlledHamRadio/message/33289 Cheers, Oliver KI3P

At some point I will redo all the headers and pins again with new Tweeny and Hat. The last one I built I dispensed with the sockets and just soldered it all to the pins and the main board. As long as

I can give you some insight for how the VHF-UHF module works. It’s a complete module except for the I/Q decode and code. It has its own antenna connections, Connects to the control cable… has

Jerry, Version 66.4 had a bug that caused my T41 to oscillate above 20m. 66.9 solved that. If you take out the MW high pass you need to make sure you have a dc blocking cap in its place. Oliver posted

*** I built it. - Jerry, KF6VB

Jerry… on the 1.8 MHZ filter… did you build it on the LPF or did you just short across it? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big

Hi Jerry, I was also having oscillations on high bands, traced mine back to the T/R switch plug in. 20 pins in total but only one of them was a ground, pin 2 of the TR CTL. I had a loose fitting

This shows the diagram for two receivers, but just ignore the second one and the 100W amp. Jack, W8TEE

Forgot the TDA7312…. One of my favorite parts! Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner

“I have mentioned to Bill and Oliver that I would like to see a small PCB hold the 4 connectors (mic, PTT, headphones, and key) just because the current direct wiring makes the front look like a

Hello all, My T41 has been oscillating on bands higher than 20M. I think others have traced a similar problem to U8, the first analog switch in the receive path on the K9HZ LPF control card. I just

Dr. Bill and Oliver, Al and Jack could not have found a more capable pair to take the T41-EP project over the horizion into what we will find in the infinite Experimentation Beyond. I have searched

All:Obviously I agree since I suggested to Al that Bill take the hardware over, to which he was in total agreement. Same for Oliver on the software track: both were done in consultation. In the

Like Oliver on the Software side, I have graciously been handed the hardware side of the T41 development moving forward. (Just my take with this next statement) The software side is easier to