Difference between revisions of "HW-9 VFO"

From Land Boards Wiki
Jump to navigation Jump to search
Line 56: Line 56:
 
** Rx
 
** Rx
 
** BFO
 
** BFO
 +
 +
==== VFO TX ====
 +
 +
* From 5.9993-5.7493 MHz
 +
 +
==== VFO RX ====
 +
 +
* RIT knob is taken in through an A/D and adjusts the frequency plus/minus 1 KHz
 +
 +
==== BFO ====
 +
 +
* 8.8314 MHz in receive
 +
* 8.8307 MHz in transmit
  
 
=== Low Pass Filters ===
 
=== Low Pass Filters ===

Revision as of 22:53, 26 September 2020

This is a work in process - Gathering pieces.

HW-9.PNG

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 Tx/Rx/BFO frequencies 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
    • Low pass filters to turn square waves to sine waves
    • 27 MHz crystal

Parts

Blue Pill Card

128x32 OLED

Rotary Encoder/Breakout Board

Si5351 FrequencyGenerator

  • 3 outputs
    • Tx
    • Rx
    • BFO

VFO TX

  • From 5.9993-5.7493 MHz

VFO RX

  • RIT knob is taken in through an A/D and adjusts the frequency plus/minus 1 KHz

BFO

  • 8.8314 MHz in receive
  • 8.8307 MHz in transmit

Low Pass Filters

  • 6 MHz

Schematic

VFO-001-SCHEMATIC.PNG

Libraries

Videos

Retrieved from "http://land-boards.com/blwiki/index.php?title=HW-9_VFO&oldid=4956"