HW-9 VFO
This is a work in process - Gathering pieces.
Contents
Features
- Replace HW-9 internal VFO with a digital VFO
- HW-9 VFO has legendary issues
- Mechanical issues with vernier
- Drift due to thermal
- Lack of resolution
- HW-9 VFO has legendary issues
- Fits within HW-9 VFO Box
- Controls Tx/Rx/BFO frequencies with rotary encoder
- 10 Hz steps
- DD1306 OLED Display
- I2C Interface
- "Curved" display
- Uses RIT control on HW-9
- +/- 1 KHz RIT
- Blue Pill Microprocessor
- Arduino compatible
- 3.3V
- Understands band switch for MHz displayed
- Si5351 Oscillator
- I2C Interface
- 3 Outputs
- Transmit frequency
- Receiver frequency include offset plus RIT
- BFO frequency
- Low pass filters to turn square waves to sine waves
- 27 MHz crystal
Parts
Blue Pill Card
128x32 OLED
Rotary Encoder/Breakout Board
- Includes pushbutton Switch
- Needs R/C filter on output
- Includes Pull-Up resistors
Si5351 FrequencyGenerator
- 3 outputs
- Tx
- Rx
- BFO
Low Pass Filters
- 6 MHz
Libraries
- VFO and BFO with Si5351A, OLED and Arduino
- U8g2: Library for monochrome displays, version 2
- Si5351 Library for Arduino
- Universal Digital VFO Si570/Si5351
- Adafruit_Si5351
- Si5351 Library for avr-gcc
- vk3hn_VFO_controller
Videos
