Skip to main content


Showing posts from February, 2018

Reducing CW Key Errors in uBITX

Reducing CW Key Errors in uBITX

uBITX uses ADC to distinguish CW Keys.
Unmodified uBITX uses A6 of ADC I / O as CW Key input.
The A6 is connected to 5Volt with a 4.7K ohm resistor.

The Arduino ADC has a value between 0 and 1023.
As shown in the figure above, A6 is connected to 5Volt at 4.7K, so you will get a value of 1023.
1023 / 5 * 5(input) = 1023

If you press the straight key, A6 will have a value close to zero.
1023 / 5 * 0(input) = 0

To use Paddle with uBITX, we need to use 2.2k and 10k resistors.

When press the Dot key of Paddle
5 * 2.2 / (4.7 + 2.2) = 1.594
1023 / 5 * 1.594  = 326

When press the Dash key of Paddle
5 * 10 / (4.7 + 10) = 3.4
1023 / 5 * 3.4 = 695

When both Dot and Dash are pressed 5 * 1.8 / (4.7 + 1.8) = 1.3 1023 / 5 * 1.3 = 265

The above values are ideal values.
In actual use, errors occur in the measured value due to the error rate of the resistance, the length of the wire, and the resistance of the key contact.
Therefore, we use a wide range of values as shown b…

Using memory channels in uBITX (Storing / recalling frequencies / naming channels)

Using memory channels in uBITX
Storing / recalling frequencies / naming channels in uBITX

This function is supported in uBITX Firmware CEC Version 1.0 or later.

At the bottom of this document is a video shot while creating the manual.

1.Storing Frequency and mode
  - Turn the dial to set the desired frequency.

 - Press the Function Key

- Turn the dial until 'VFO To Channel' Appears

- Press the function key
The channel will be visible.
If you are using this function for the first time, you will see an empty frequency like 'CH01:'.

- Rotate the DIAL until the desired channel appears.

- Press the Function key
'Saved Frequency' message appears and hide

- The current frequency has been saved with the mode you chose.

2.Naming Channel
  This feature is to give the channel a name.
  You can only use the Name tag from channel 1 to channel 10.

- Execute uBITX Manager , Set Comport, baud, stopbit, data bit, parity and Press the Connect button

- Press the Read Button

- Pres…