开云体育

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. /g/BITX20/message/44099

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 /g/BITX20/message/46616

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. /g/BITX20/message/51673

8. Then I changed the relays to Axicoms ?as suggested by Mike W0MNE, to reduce harmonics when using SSB on the lower HF bands. ?/g/BITX20/message/60368

9. Finally, I replaced L7 and L5 with SMT inductors as suggested by Raj VU2ZAP to reduce spurs on the higher HF bands. ?/g/BITX20/topic/27154925#60729
   
   

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