I strongly advise against using any kind of tape on a daughterboard containing a silicon IC. Tape can store a lot of charge, and the stickier the tape the worse the charge build up. You risk zapping t

#ubitx #tda2822

Sent an email to Oddwires through their contacts webpage, got a reply within minutes: Hi Jerry, thanks for your inquiry. Board is configurable with a solder junction to 5 or 3.3V. Let me know if you n

#ubitx #tda2822

The USB-to-UART cables sold for use by Arduino hobbyists generally have 0-5v logic levels, not RS232. That thing on Oddwires I suggested in a previous post: http://www.oddwires.com/cp2102-serial-adapt

#ubitx #tda2822

Dex ZL2DEX Beauty of using the built-in UART and built-in USB interface on an Arduino NANO is that you don't have to mess with voltage level conversion between RS-232 and TTL. This is also convenient

#ubitx #tda2822

The Arduino already does UART, digital pins 0 and 1 get tied to the CH340 usb chip on the Nano. That chip converts the usb interface on your host into UART TX and RX that the ATMega328P can deal with.

#ubitx #tda2822

I like it! UART to the rig - could do high-rate given logic-level, UART<->USB remote to take the place of the old RS232 (remember them ol' D9 and D25 cables and connectors?). What sort of cost? How wo

#ubitx #tda2822

Could be that different rigs exhibiting obnoxious audio tones are due either or both oscillators. Luck of the draw as to where those ceramic resonators land. Could tell which one by varying the BFO, i

#ubitx #tda2822

The baud rate is the effective data rate. It still has to have some kind of frequency driving it. Perhaps the most effective solution is to switch the supply voltage to the CH340 chip. That is 3.3v at

#ubitx #tda2822

Given all the different Raduino's getting built, seems reasonable to just build one without the 12mhz and 16mhz oscillators. This could be plug and play, an easy solution for the now thousands of uBit

#ubitx #tda2822

Jerry: 12 MHz is necessary for ANY USB interface. The 12 MHz xtal on the radiuno drives the CH340 chip. It cannot be disabled (or changed very much) and have USB work anynore. Similarly, any other chi

#ubitx #tda2822

For all that matter, I'm using one of the Adafruit boards in my CB-to-10 conversion. It works well. Only using one clock tho, but your si5351 routines. Vince.

#ubitx #tda2822

We could mount an si5351 the Adafruit si5351 breakout board to the back of the uBitx: https://www.qrp-labs.com/synth.html https://www.adafruit.com/product/2045 https://www.etherkit.com/rf-modules/si53

#ubitx #tda2822

Another solution would be to separate the Si5351 from the raduino. Put it on its own board that plugs into the uB. Pins 10-16 pass thru to another connector. Another connector connects the I2C to the

#ubitx #tda2822

What we need is a scratch built Raduino board that takes an ATMega328P chip, an si5351, regulators for 5.0 and 3.3 volts, and has a carefully chosen frequency on the oscillator for the processor. Or a

#ubitx #tda2822

Hello Jason, On mine, I noticed that the tone frequency would change the most when I adjusted the BFO frequency. If you re-calibrate the BFO to a slightly different frequency, does you tone move as we

#ubitx #tda2822

Removed and replaced nano. Unfortunately that was rather destructive for the nano. Now the noise peak moved from 9khz to 11khz. So next change may need to be a filter.

#ubitx #tda2822

Maybe you can start with something like this https://www.alibaba.com/product-detail/TDA2822M-2w-x-1-Mono-Audio_60249198640.html

#ubitx #tda2822

I didn't notice it too much myself until someone pointed it out. Now it drives me crazy. Was thinking if I am going to build an audio filter I might as well socket the MX TDA2822 and mount the IC to b

#ubitx #tda2822

Wish I could still hear 9kHz ... :-/

#ubitx #tda2822

How about a low pass filter at about 5Khz? you want voice audio, not violins..

#ubitx #tda2822