Difference between revisions of "HW-9 VFO"
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*** BFO frequency | *** BFO frequency | ||
** Band pass filters to turn square waves to sine waves | ** Band pass filters to turn square waves to sine waves | ||
| + | ** 27 MHz crystal | ||
Revision as of 16:02, 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
- HW-9 VFO has legendary issues
- 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
