My list of mods and Chronology of Installation #ubitx

Daniel Conklin

  1. I ordered my uBITwX December 29, 2017 and received it on March 2, 2018.  It was a version 3 with the WX branded TDA2822 audio chip. By the time I was ready to assemble, Ron, W7HD had posted a fix using a voltage regulator.  This was my first mod and I have had good working audio since then.

  2. The second mod I implemented was installing the KD8CEC firmware which was more intuitive for me and solved some issues such as keying responsiveness.

  3. The third mod was to add a short USB cable from the Arduino Nano to allow data access outside the case.

  4. The forth mod was adding the click-pop suppression kit from Don ND6T, Wayne VA7AT, and kitted by Kees K5BCQ.

  5. The fifth mod was the RF output peaking mod suggested by Howard Fidel WB2VXW

  6. The sixth mod was the ND6T AGC kit that I got from K5BCQ at the same time as the click-pop kit.  When I installed that, I used Kees’s installation suggestions for mounting it on the main board, added an RF attenuator/gain control as suggested by ND6T, and also hooked a wire from J1 to the purple analog wire on the Raduino to give me an S meter.

  7. While I had the board on the table I also changed R250 to 100K to reduce the sidetone level and replaced the C1 cap with a 1μF to shape the CW note.

  8. Then I changed the relays to Axicoms  as suggested by Mike W0MNE, to reduce harmonics when using SSB on the lower HF bands.

  9. Finally, I replaced L7 and L5 with SMT inductors as suggested by Raj VU2ZAP to reduce spurs on the higher HF bands.

I am very happy with how well my uBITX functions at this point and have the placed it in a small Apache case behind an aluminum faceplate I fabricated.  The whole thing is pretty rugged and works well with a three cell 18650 battery pack. I finally have the spy radio I have always wanted. 73 and Happy New Year!  Dan W2DLC


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