Ubitx Manual V2

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USER MANUAL FOR
VFO/BFO with Si5351 and TFT touch screen for uBitx txcvr
VU2SPF, SP Bhatnagar,
Bhavnagar, INDIA

and

VE1BWV, Joseph Basque,
Canada

(Ver 2.9bU)
Watch videos produced by Joe Basque on YouTube - Look for VU2SPF / VE1BWV.
Also on Facebook BITX group.
https://www.youtube.com/results?search_query=vu2spf
Other useful liks:
vu2spf.blogspot.com
https://github.com/sprakashb/TFT_TouchScreen_for_uBitx
ubitx.net also has some details

Main Features :
- Uses low cost Si5351 for generating three independent VFO and BFO frequencies needed by uBitx.
- Touch screen controlled UI on colour TFT for controlling functioning of uBitx.
- Two VFOs A/B and one Memory VFO.
- 100 memory channels for storing frequently used stations (more channels possible)
- Switch between VFO and Memory by touch.
- All VFO and BFOs are adjustable from screen / buttons.
- Frequency adjustments in steps of 1Hz, 10Hz, 100Hz, 1kHz, 10kHz, 100kHz and 1MHz.
- Some touch buttons are Two Sided (left and right half of button works independently) .
- Some touch buttons are Single Push (touch) type.
- Saving parameters to EEPROM on demand (not automatic, thus reducing memory write operations to
extend life of CPU).
- Uses low cost MCUFriend 2.4” / 2.8” colour display. Larger ones also work but may need minor
tweaks.
- Horizontal S-meter.
- Preset Ham Bands. Band Limits are hard coded / adjustable in program code.
- Continuous frequency output mode (frequency generator mode).
- Uses standard Arduino Mega 2560. Assembled in short time with any standard 5351 breakout board.
Minimal soldering (if external buttons needed).
- Also available all details of a special shield / PCB designed for use as a freq generator and other
control lines ( our 5351 breakout board) which connects the Arduino Mega with Si5351 and uBitx.
- Also possible to connect external rotary encoder and buttons along with Touch screen controls.
- PTT from Touch screen or external switch (mic / front panel / foot switch)
- Toggle type or continuous press type PTT.
- PTT timeout to reduce Final amplifier heating. Useful in some digital modes.
- Many user programmable parameters in the Arduino program.
- Can control bands by controlling from digital pins of Arduino Mega under Program control.
- Many digital outputs and Analog inputs for additional controls still available for other extensions.
- SPLIT mode using VFO A (Rx) and B (Tx).
- CAT control of main features. Simulated as Yaesu – FT817. Works with WSJTX, FLDIGI, HRD etc
- Auto-frequency scanning up to band edges

User Interface
All radio control functions are carried out by touching in the button area (except volume control!). The
screen has several touch buttons and their corresponding information is displayed on the button itself.

The function of each button is described below. Please note that for explaining the functions of buttons
I have annotated the buttons below (by ‘<’ which decreses and by ‘>’ which increases the value). The
vertical line near the center of the button is also for explaining the two halves of the double sided
buttons.
VFO button: Repeatedly touching this button rotates between VFO A, VFO B and VFO M (Memory).
This selects the VFO which will become active. A, B or M is displayed below this button
and to the left of frequency display (Curr VFO). This one is touch anywhere button.
Mem ## : Shows the currently selected memory channel number (01 to 100). On touching right half of
the button the memory channel number increases from 00 to 100. Touching the left half of this button
decreases memory channel number. On changing the memory number, the
stored information (vfo frequency, bfo frequency, sideband) from EEPROM
is read and copied to VFO M. If VFO M is current vfo then the retrieved
frequency will be output on VFO otherwise it would be displayed in the Info area below.
The contents of currently selected VFO are displayed in VFO frequency display area whereas the
frequencies of the other two VFOs are displayed in the Info area below.
Rx / Tx (PTT): on touching Rx button the PTT is activated and the button turns RED with
Tx displayed. If PTT Timeout is active (using ‘TxTmO’ button below) then it would
automatically go back to Receive mode after a preset time out (this time is user controlled in
program). In this mode the remaining time is also displayed in seconds on Red Tx button .

VFO Frequency Display : The selected active vfo (Current
VFO) is displayed here. On selecting a different VFO or
MemCh the display shows previously saved frequency for
that VFO. Touching anywhere in the right half of this
display button increases frequency by selected frequency
steps (which is displayed below in the center -1Hz to 1MHz). Similarly the touch in left half of button
would decrease the frequency by step Hz.
Info / Secondary Frequency Display : Below the active frequency button the other two VFOs are
displayed for information. If VFO A is active, then VFO B and Memory VFO are displayed under the
main frequency display. Similarly when Mem VFO is active the VFO A and B are displayed as below.

(These are purely for information of non active VFOs and are not active buttons and have no effect on
touching.)
Band : Displays the HAM band corresponding to current active VFO. Touching right / left half of this
button sequentially changes the bands. Band frequency limits are preset in the
program which should be changed according to the rules of the country. There is a
continuous freq generator mode for in between band frequencies. Tx works only
within defined band limits.
Steps : This button displays and changes current step size. Initial power up step size is 1KHz. Step size
can be increased or decreased by touching right half or left half of the button.
Steps are sequenced in powers of 10, from 1 Hz to 1MHz.(1Hz, 10Hz, 100Hz,
1kHz, 10kHz, 100kHz, 1MHz).
Side Band : Switching between USB and LSB is done by touching this button.
BFO 1/2: The current BFO 1/2 frequencies are displayed here and can be increased or
decreased by step size by touching on right and left half of the button. These are
the experimenter’s buttons. It is real fun listening to radio while adjusting BFO
frequencies in small steps to get best sounding station. In uBitx the bfo 1 has
broad adjustment range while the bfo 2 is very sharply tuned due to filters in the
two stages.
VFO > < Mem : (displayed as V > 
Source Exif Data: 
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Page Count                      : 9
Language                        : en-IN
Author                          : joseph basque
Creator                         : Writer
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Create Date                     : 2018:05:01 15:34:18+05:30

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