Difference between revisions of "HW-9 VFO"

Revision as of 14:32, 18 September 2020

This is a work in process - Gathering pieces.

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
Fits within HW-9 VFO Box
Controls frequency 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
- Band pass filters to turn square waves to sine waves
- 27 MHz crystal

https://www.youtube.com/watch?v=jRNrPIrgWto Homebrew 80/40m SSB/CW Rig - #5 VFO/BFO and BPFs

@@ Line 38: / Line 38: @@
 * [https://github.com/olikraus/u8g2 U8g2: Library for monochrome displays, version 2]
+* [https://github.com/etherkit/Si5351Arduino Si5351 Library for Arduino]
+* [https://github.com/andrey-belokon/Syntez_Si5351_Si570 Universal Digital VFO Si570/Si5351]
 == Videos ==