Difference between revisions of "HW-9 VFO"

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* Replace HW-9 internal VFO with a digital VFO
 
* Replace HW-9 internal VFO with a digital VFO
** HW-9 VFO has issues
+
** HW-9 VFO has legendary issues
*** Mechanical issues
+
*** Mechanical issues with vernier
 
*** Drift due to thermal
 
*** Drift due to thermal
 
*** Lack of resolution
 
*** Lack of resolution

Revision as of 15:46, 13 September 2020

This is a work in process - Gathering pieces.

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
  • 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 sor 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