Re: Connector Error in Schematic #bitx20help #bitx40help

Jerry Gaffke

Yes, the pin numbering for the 16 pin Raduino connector  is swapped end-for-end on the
Raduino schematic vs how it is shown on both versions of the uBitx schematic.
That's unfortunate.
In both versions of the uBitx schematics, pin 2 has 12v, and the Raduino has 12v on the
corresponding pin 15.  
The Raduino also has pin 16 tied to 12v,, the corresponding pin 1 on both versions of
the uBitx main board is left unconnected.

The schematic of the first version of the uBtix shows pin 1 grounded, this schematic is not correct.
Those boards were built with pin 1 a no connect.

There is no link from the homepage to the older version of the uBitx.
That's also unfortunate, as there are thousands of such boards in existence.

This has been corrected in the new schematic for the uBitx here, showing it to be a no connect:

The Bitx40 main board does not have such a connector, just a wiring harness.
That extra 12v wire on pin 16 of the the Raduino connector is left unused.
Here's the schematic for the Bitx40, which also shows the Raduino:

Here's the latest schematic for the Raduino from the uBitx section of the website:

I believe the Raduino for the Bitx40 and the uBitx is identical except for how the 
contrast pot and the connectors get stuffed, and of course the firmware.
The raw PC board is likely identical.


On Wed, May 30, 2018 at 05:10 pm, <tituskz1g@...> wrote:
The schematic diagram for the "B? ubitx" board (base board for Arduino Nano, Si Labs oscillator, LCD...) has an error at the P3 connector, "OSCILLATORS." The pin numbers are in reverse order and thus do not match the pin numbers on the main transceiver board schematic diagram.  P3 also shows pins 15 and 16 (which should be pins 1 and 2) both connect to the +12V for the LM7805 regulator.  Pins 1 and 2 on the mating connector in the diagram show pin 1 connects to ground and pin 2 connects to +12V.

It would help to have the signals labeled at P3 on the "B? ubitx" board, and to have the same name "OSCILLATORS" for the connector in each diagram.  The color of the connecting wires also would help at other connectors.

Another minor point...  It might help those of us who think about mods and hacks to know whether signals are inputs, outputs, or bidirectional.


Jon Titus, KZ1G
Herriman, UT USA

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