New Knob

As you can tell by the cover image at the top of this blog, I procured the tuning knob from the Elecraft KX3 but buying the knob and rubber band from them. I have put it on the uBitx, and the tuning in fantastic. Really a good tuning knob.

Moved the uBITX into a new case.

This weekend, I decided to move my uBitX to a new case, and incorporate a Nextion Screen and use KD8CEC’s updated FW for the radio. While here at the QTH, I do not have the proper tools, it did come out ok. Here is a photo of the minimal front. Tuning, Volume, and Display. On the back, There is Power, Power Switch , IF tap for SDR hookup (pan adapter), mic, key, and speaker/headphone hook up, Raduino USB extension, (bulkhead mounted). And the RF out. The only thing left is to get a new tuning knob (accomplished, will incorporate later this week!). (Also, pardon for the messy work bench.)

 

IMG 3009

uBITx Audio Amp woes

So, I got a new power supply at the Seaside Hamfest on the first week of June. I plugged my uBitX into it and a pop happened. Seems the audio amp chip popped its top. After asking a question on the uBitX FB group, Daniel King recommended a NJM2073D to replace it. Ordered about 5 of them, because you never know. Replaced it, this afternoon, and audio is back and they handle the 14 VDC the power supply was putting out. Apparently, there is a know issue with some of the stock audio amps in the uBITX and they seem to pop with more that 13 volts.

Now, what to do with the uBITX?

The uBITX comes with a 2 line display and an Arduino CPU. (not shown). I am designing a 5″ display, Cortex-A8 (minimum) CPU with the Si5351A Synthesizer chip, and will be writing the FW for it. Also, will be designing a circuit to tap off the IF and provide a band scope/waterfall on the 5″ display. In addition, will be designing an audio circuit so that the radio can be plugged into a computer to run digital modes. (Maybe include a decoder in the FW?). Maybe just put a bluetooth module and write a control protocol, and build an iOS app/macOS App to run the radio. Now, this sounds ambitious, and it is, but I really want to build the radio they way I want to. I will probably add a remote facility to control it via a network, or better the web (OpenWebRX?). I am hoping to be similar to the display in the second picture. If it turns out well, it could become a side business.  The display will look somewhat like this:

Screen Shot on 2018 02 18 at 15 08 47