SDR Transceiver - SARCNET

• The prototype is powered by a USB battery pack. The final design will include a 12-5V DC/DC Converter.
  
• The prototype uses an amplified speaker. The final design will include a speaker amplifier and external speaker.
• The prototype uses standard audio cables. The final design will use a cable loom.

• To start Quisk: Select Main Menu | HamRadio | Quisk; or click on the headset icon in the Launch Application Bar
• The Quisk display is the small-format Quisk display
  
• Additional options appear for buttons shown with the => symbol
  
• All displays are maximized to fit the screen
  
• The Menu Bar is used to select between displays
  
• The Terminal window can be used with an on-screen keyboard for text entry
  
• The capacitive touch screen works well with a stylus
• A wireless mouse is easier as the wheel can be used to tune frequencies

• Quisk is open-source and was originally written by James Ahlstrom, N2ADR.
  
• Many others contributed to Quisk, and are mentioned in comments in the source code.
  

• To start WSJT-X: Select Main Menu | HamRadio | WSJT-X; or click on the WSJT-X icon in the Launch Application Bar
• The WSJT-X display is maximized
• For more information please refer to the WSJT-X user guide

• The transceiver is controlled by an Attiny85 microcontroller, programmed as a USB device.
  
• The local oscillator is a Si570, which works at 4-times the operating frequency. The output is divided to provide two quadrature-phase signals.
  
• The receiver has a bandpass filter, quadrature detector and I & Q baseband amplifiers
• The transmitter has I & Q baseband amplifiers, a quadrature encoder and bandpass filters

• Broadcom BCM2837B0, Cortex-A53 (ARMv8) 64-bit SoC @ 1.4GHz
  
• 1GB LPDDR2 SDRAM
  
• 2.4GHz and 5GHz IEEE 802.11.b/g/n/ac wireless LAN, Bluetooth 4.2, BLE
  
• Gigabit Ethernet over USB 2.0 (maximum throughput 300 Mbps)
  
• Extended 40-pin GPIO header
  
• Full-size HDMI
  
• 4 USB 2.0 ports
  
• CSI camera port for connecting a Raspberry Pi camera
  
• DSI display port for connecting a Raspberry Pi touchscreen display
  
• 4-pole stereo output and composite video port
  
• Micro SD port for loading your operating system and storing data
  
• 5V/2.5A DC power input
  
• Power-over-Ethernet (PoE) support (requires separate PoE HAT)
  

• Module Properties: Non-isolated step-down (buck) module
• Rectification: Non-synchronous rectifier
• Input voltage: DC 5V-30V
• Output voltage: DC 0.8V-24V (Adjustable, Output < Input)
• Output current: 2.5A. (5A with heatsink)
• Conversion efficiency: 90%(highest)
• Switching Frequency: 300KHz
• Output ripple: 30mV(maximum)
• Load regulation: ±0.5%
• Voltage regulation: ±2.5%
• Operating Temperature: -40℃ ~ +85℃
• 43mm*21mm*14mm(L*W*H)/1.69'' * 0.83'' * 0.55'' approx
  

• Maxim DS1307 chip
• CR1220 button cell power backup
• Can be operated with shell command
• Includes a serial port connector
• Programmable square-wave output signal
• Consumes Less than 500nA in Battery-Backup Mode
• Automatic Power-Fail Detect and Switch Circuitry
• Pin Header is used to supply 5V to the Raspberry Pi / HDMI Display

• Screen Type: IPS Screen
  
• Screen Size: 7.0 inch
  
• Resolution: 1024x600
  
• Backlight Adjustment: Independent Button To Turn On
  
• Touch Screen Type: Capacitive
  
• Touch IC: GT911
  
• Power Supply: Micro USB (5V / 2A)
  
• Video Input Interface: HDMI-Compatible
  
• Audio Output Interface: 3.5mm Audio Interface + 2 Speakers (8Ω2W)
  
• Size: 164.9 X 102mm/6.49 X 4.02"
  
• Note: The two HDMI speakers and the touch screen are not used

• Power supply voltage: 13.8V
  
• Power supply current: 6-10A
  
• Maximum input power: 5W
  
• Maximum output power: 70W
  
• Frequency range 3.5--30Mhz (10M - 80M)
  

• Single band LPF
• Increase capacitor voltage for higher power

• Raspberry Pi OS
• wxPython
• Quisk
• WSJT-X
• FLDIGI
• The Main Menu and Application Launch Bar
  

Notes:

1. Always use the latest instructions and software form the sources above.
   
2. Some filenames, which might need to be changed in the future, are highlighted.
   

• RPi temporarily connected to:
• USB powered hub connected to:
• USB Keyboard; and
• USB Headset
• RPi connected to:
• HDMI Touchscreen Display (via HDMI and USB joiners);
• HiFiBerry (via 40-Pin Header);
• Real Time Clock (via 40-Pin Header) connected to:
• 12V - 5V DC/DC Converter connected to:
• 12V Power Supply
• USB Mouse (dongle); and
• Softrock RXTX Ensemble connected to:
• 12V Power Supply;
• HiFiBerry (via 3.5mm Audio Cables); and
• HF Antenna

sudo reboot

Note: This frees up resources for building wxPython. It is much faster and does not freeze.

sudo raspi-config nonint do_boot_behaviour B2

sudo reboot

Note: This step will take several hours (~2.5 on a RPi 3B+). To recover from any lockups - Just cycle the power and run it again. It will start up where it left off. However, if you want to redo this step from scratch, run "python3 ~/wxPython-4.1.1/build.py cleanall bdist_wheel" and start again from "Unzip wxPython" above.

sudo raspi-config nonint do_boot_behaviour B4

sudo reboot

Note: Repoen this web page to continue

Note: Then run "sudo reboot" to reload the rules.

Note the "Si570 crystal frequency", e.g. fx = 114285000

Set the "Si570 crystal frequency" to: fx - 25 x (fc - 5000000), e.g. 114236500

Press Enter, close and restart Quisk

Repeat the above process until the centre of the reference signal is at the reference frequency

e.g. fx = 114236500, fc = 4999820, "Si570 crystal frequency" = 114241000

Open ~/quisk_settings.json with a text editor

Change: "rx_max_amplitude_correct": "0.2" to: "rx_max_amplitude_correct": "0.4"

Change: "rx_max_phase_correct": "10.0" to: "rx_max_phase_correct": "20.0"

Save the file