Difference between revisions of "HW-9 VFO"

Revision as of 01:34, 26 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

@@ Line 28: / Line 28: @@
 ** Band pass filters to turn square waves to sine waves
 ** 27 MHz crystal
+=== 128x32 OLED ===
+* [https://www.ebay.com/itm/2pcs-0-91-128x32-IIC-I2C-White-OLED-LCD-Display-DIY-Module-For-Arduino/293688288048?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 Ebay]
+=== 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
 == Parts ==