Difference between revisions of "HW-9 VFO"
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* [http://toroids.info/FT37-43.php Toroid Calculator] | * [http://toroids.info/FT37-43.php Toroid Calculator] | ||
** [https://kitsandparts.com Kits and Parts dot Com] | ** [https://kitsandparts.com Kits and Parts dot Com] | ||
| − | * [https://kitsandparts.com/PCBs/LPF/filter2.pdf | + | * [https://kitsandparts.com/PCBs/LPF/filter2.pdf A short guide to harmonic filter for QRP transmitter output] |
== Videos == | == Videos == | ||
Revision as of 14:26, 18 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
Parts
Videos
https://www.youtube.com/watch?v=jRNrPIrgWto Homebrew 80/40m SSB/CW Rig - #5 VFO/BFO and BPFs
