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Robert Do you have a driver for the SPI to the display? If not, how long is the cable? Try a very short cable if you have no driver. Humor me. My theory is that lockups occur because the SPI fails

Oliver, thanks, I remember that now. I got confused due to the comment in SDT.h for the #include <RA8875.h> that gives the url for the RA8875_4 library. It should probably be removed. However, it

The Teensy display library is different than the Adafruit library. Try changing libraries. Jack, W8TEE

You should be using the RA8875 library that comes bundled with the Teensyduino package, so you can remove the Adafruit library. That might be the source of your issue.

I went back to W8TEE's Ver 66-3 release and compiled, with no changes. It compiled and loaded and it makes it to the main screen. Serial monitor gets to Setup Complete. Totally frozen, no shut down.

My Flex 6400 has found a new home. Jack, W8TEE

So you probably want to characterize the gain (loss) from the antenna input on the LPF to TP6 of the RF board since we specifically put U2 in to overcome the loss from the BPF and the attenuator on

The insertion loss of the attenuator chip when set to 0dB is roughly 2dB below 20 MHz and increases at higher frequencies, so the loss you're seeing is expected. See this plot of the receive

Cool! Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand Piton - J68HZ Soufriere,

Look at Oliver, sportin' V066.7 Go Oliver!

Hi Bill- That is a bit of roll-off in the baseband circuitry which follows the QSD (quadrature sampling demodulator). That's a trade-off when using the demodulator for both demodulation and as a

Thanks to all for the help. I was misunderstanding the signal path, thinking that the BPF was out of the signal path during transmit. My T41 is working with several watts out! Now to finish

Need to calibrate it. Its not absolute. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator

Good morning Greg, Last night was able to get the T41-2 main board/qse2/qsd2 combination working in what was originally a 4SQRP T-41k. (so far just on receive) I noticed that the right side of the

The transmit attenuator is working in that the amount of attenuation is able to be adjusted by the setting in the Menu. However at the 0dB attenuation setting I am getting -3dB. I have a 50 ohm load

And this is what i get when i text on my phone at 5 AM… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner

With the replacement of the follower and filter op amps post mixer, i see about a 7db improvement and at that point i believe the limit is the mixer, si 5351, and line shielding between the. We are in

Greg, I get a very similar number for the noise floor (-131 dBm) if I tune away from the display noise, so the V12 hardware is capable of achieving similarly low noise floors if you can fix the

Mark, I don't see the disappearing audio issue in the beta version of the code (V66-7) that I'm testing, so it's been fixed. It'll come out soon; Al has rewritten the calibration routines and added

Great! Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand Piton – J68HZ