I found this on amazon. It looks like it is pin compatible with arduino nano. I wonder if this can be used to replace nano with arm processor alternative.

RobotDyn - SAMD21 M0-Mini 32-bit ARM Cortex M0 Core Compatible with Arduino M0 Form Mini and Pinhead soldered- Arduino m0 pro Compatible SAMD21 M0-Mini 32-bit ARM Cortex M0 core (Pinheaders Soldered)

73

Barb WB2CBA

On Jan 6, 2020, at 19:50, Jim Sheldon <w0eb@...> wrote:

?TSW (the Triumvirate Skonk Worx of W0EB, W2CTX and N5IB) are pleased to announce the immediate availability of an inexpensive plug-in adapter that will allow a PJRC.com Teensy 4.0 with a 600 MHz processor and lots of flash program memory to directly replace the NANO in a V6 uBITX Raduino!

We also have available (open source) software for same Teensy 4.0 that runs and looks almost exactly like the original factory V6 software except it's many times faster and with lots of program space, has a few extra niceties built in.?

The adapter kit is available now, and details on how to purchase one can be found on the TSW website - .? The software is also available in the "uBITX files directory via the link near the top of the page on the TSW website.

I have one running extremely well on an actual Version 6 uBITX (basic kit) that I received a day before Christmas.?

I built it up using a 3D printed front panel & base I designed using the factory supplied acrylic front panel template for dimensions.

One nice thing about using the Teensy 4 instead of the NANO aside from the display speed is that it eliminates many of the birdies associated with the various oscillators on the NANO board and I can detect NO tuning clicks when the encoder is turned.?

The only drawback is with the 3.3V max input levels for the Teensy 4.0, the Factory's keyer code had to be abandoned, R2 had to be removed and the trace that goes from input pin A6 to the NANO and the "KEYER" pin on the 18 pin right angle connector must be cut to use the adapter with a V6 Raduino.? If this isn't done, +5V gets applied to the A6 input pin on the Teensy and will destroy the ADC in the Teensy.? We tried applying 3.3V to the Vcc side of R2 but the voltage divider outputs weren't read reliably by the Teensy's ADC and the keyer didn't work well at all.? We re-wrote the keyer to use the A6 and A7(spare) inputs with A6 being the DOT input and A7 being the DASH input.? This also requires a separate jack for the paddles but makes the keyer really sing if the mods are done.

TSW also plans our own Raduino Clone for the V6 that will have pluggable jumpers to cover removing the voltages and will operate exactly as a Factory Raduino using a NANO or by setting the jumpers work with the Teensy 4/adapter in place of the nano without cutting any traces or removing R2.? This will be available as soon as the PC boards get here and are tested, possibly next week sometime.? It's dimensions will be such that with the 2.8" ILI9341 TFT display mounted, it will directly replace a Factory Raduino.? It will be offered only as a kit but the kit price will be reasonable.? With the kit, the display and Teensy will not be supplied as they are readily available via PJRC and other suppliers.

Jim, W0EB
TSW Project Coordinator

We also plan on another Raduino Clone that will

Reed,

I'm the newest of noobs on this whole groups thing, I don't know what a pull request is or where to create one.? Pretty much the same for github.? ?I'm not sure its worth losing much sleep over it though because if anyone ever does get the Morse reader working that F problem will show up right away ...

Ray

Have you set the BFO?

On 6 Jan 2020, at 19:49, Andy_501 <andrew.webb.501.ve4per@...> wrote:

Propagation here at my qth is and has been very poor for a long time.

In the documentation it states startup setup menu on power up and adjust
for 10MHz base ref freq exactly then set the BFO freq.

I am unable to get a base ref freq of 10 MHz to start with; mine will
only adjust to 10500. I have set BFO to 11.055.

I am unable to hear strong HF white noise and/or any of the CHU Canada
or WWV time broadcasts but I can obtain a couple of AM broadcast
stations; however the demodulated audio not being in AM mode is Donald
Ducky sounding but partially intelligent albeit rather weak both on
built in speaker and/or on ext powered amplified USB speaker connected
via the SPKR jack.

I am unable to tune through either side of the signal to get to get rid
of the donald duck sounding?? quality audio signal to listen to.

Seems as though audio passband is so narrow or restricted that listening
to a full sideband { 300-3000 Hz} is not possible. Is there a
calibration or software adjustment I can make on an immediate or test
basis using the Arduino immediate editor to adjust this. I am not very
happy with the receive so far.

I have the Arduino IDE installed per online instructions but not experienced
in using it regularly yet. (haven't got enough practical time/experience to sort
out the 17M unselectable fix yet even.

Also I noticed when I set the freq to anything below 1 MHz like 920KHz,
990Khz or 680 KHz and save it the VFO indicator adds an extra zero in
the display so 990AM KHz would appear as 9.9MHz on the display but the
audio signal is the 990 AM audio. If I select 1290 KHz?? AM the VFO
display reads correctly and audio is what I expect to hear (except for
the water barrel or Donald Ducky audio quality).

I have a kiwiSDR registered on sdr.hu under my callsign name and it can
produce reasonable sigs for WWV and CHU yet the BITXv6 doesn't when I
compare it.

Any suggestions? all help/tips gratefully accepted.

73 de ve4per / Andy