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nanodds

DDS for SSB 6.1 transceiver based on Si5351A, ST7735 and ATMega1284p

Current WIP

Memory - Save state - List cells - Load

Planned function

Buttons

  • Encoder

    • Short press - enable/disable RIT (transmits on the main frequency).
    • Long press
      • If encoder is rotated - change step of frequency

  • TX

  • Mode

    • Single press - switches type of modulation
    • Press & hold when is booting - opens Settings mainMenu (use Encoder to navigate and change the values, use Encoder button to activate the mainMenu item and rotate to change, second click will return focus)

  • VFO

    • Short press - switches between A/B VFO
    • Long press - enables SPLIT. Allows to transmit on alternative frequency. For example if you are receiving at VFO A, you will be transmitting at VFO B frequency.

  • BAND

    • Short press - cycles through list of bands

  • STEP

    • Changes step from 1 Hz to 1 MHz in power of 10th.

  • MEM (MENU)

Use MEM to exit w/o Save *1s
--
[Memory]
    Save selectedActionIndex as new cell
    [3.760300, LSB]
        Load
        Overwrite with Current
            Y/N
        Erase
            Y/N
    Erase All
        N/Y
    <<
[CW]
    Words Per Minute <50>
    Iambic Keyer      [x]
    Mode              <A> 
    Reverse Pads      < *- | -* >    
    CW Tone         <800>
    <<
[SWR]
    Analyze Band
    <<
[Settings]
    Intermediate Frequency
        <8000000> MHz
    SSB Offset
        <1400> Hz
    DDS Calibration
        <-0> Hz
    [SWR Calibration]
        Set 50 Ohm point
        Set 100 Ohm point
        <<
    [Language]
        English
        Русский (Russian)
        Espaniol (Spanish)
        <<
    [Pano]
        <Whole Band|Part of the Band>
        Swipe size
            +/- <10> kHz
        <<
    Allow TX after startup []
    
    <<
About
<<

Ideas

SWR Analyse should scan the band with minimal output power and plot the SWR graph. Display Max, Min SWR & Frequencies.

Support of multiple languages.

Watch demo on Youtube

DDSVIDEO

Dependencies

Programming

  1. Build
pio run --target=upload -e Debug
  1. Fuses
avrdude -v -pm1284p  -c avrispmkII -P usb:16:79 -B 10 -U lfuse:w:0xee:m -U hfuse:w:0xd6:m -U efuse:w:0xfd:m
  1. Actual software
avrdude -p m1284p -c avrispmkII -P usb:16:79 -e -U flash:w:.pio/build/Debug/firmware.elf:e -v -B 10

Logic State - active state AppSettings - global rarely updated changes

Per http://www.rfcafe.com/references/electrical/spectral-inv.htm we have DDS always running above receiving RF signal therefore LO1 frequency = RF + IF which results in spectral inversion. To make sound undistorted we must perform second spectral inversion by setting LO2 at the upper edge of the filter.