Difference between revisions of "HW-9 VFO"

Latest revision as of 10:38, 30 October 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
- Backwards dial
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

Schematic

Connections to Radio

RIT pot
- Connects to Analog input
  - Polled occasionally while in receive
Band switch
- SW1 9V
T/R - transmit/receive

Parts

Blue Pill Card

Blue Pill Card

3.3V operation work without level shifters for I2C
- OLED can run from 3.3V
- Si5351 can only run from 3.3V
Used right angle headers and Dupont cables
Replaced BOOT 0,1 jumpers
- Jumper on BOOT1
- Switch on BOOT0 - easier to download code
Download via serial
Arduino IDE

128x32 OLED

Ebay

Arduino Library for OLED

U8g2: Library for monochrome displays, version 2
- Reference library
- Constructor

U8G2_SSD1306_128X32_UNIVISION_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);   // STM32, Ebay OLED

List of Fonts

  u8g2.setFont(u8g2_font_ncenB14_tr);

Hello World Code

U8G2_SSD1306_128X32_UNIVISION_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);   // STM32, Ebay OLED

void setup(void) {
  u8g2.begin();
}

void loop(void) {
  u8g2.clearBuffer();			// clear the internal memory
  u8g2.setFont(u8g2_font_ncenB08_tr);	// choose a suitable font
  u8g2.drawStr(0,10,"Hello World!");	// write something to the internal memory
  u8g2.sendBuffer();			// transfer internal memory to the display
  delay(1000);  
}

Rotary Encoder/Breakout Board

Includes pushbutton Switch
Includes Pull-Up resistors
Needs R/C filter on output for debounce
Reading Rotary Encoders - Arduino reference
Simple Rotary Encoder Arduino library
Library for the Arduino environment for using a rotary encoder as an input

Si5351 Frequency Generator

I2C Daisy-chain connector
3 outputs
- Tx
- Rx (may not need to use separate output)
- BFO - could be adjusted

Measurements

VFO TX

250 KHz range
- From 5.9993-5.7493 MHz

VFO RX

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

BFO

8.8314 MHz in receive
8.8307 MHz in transmit
700 Hz difference but could be adjusted

Low Pass Filters

Si5351 has square wave outputs
LP filter can be used to change squarewave into sinewave
LC Filters Design Tool - calculator
Kits and Parts dot Com
- Build a 7-pole Universal Low Pass Filter for HF
- Butterworth
- Replace with SMT card?

VFO and BFO frequencies are outside the bands (deliberately to void collisions)

BFO Filter

8.8314 MHz in receive
8.8307 MHz in transmit

Libraries/Example Code

Videos

VFO Design

Charlie Morris YouTube channel

Misc videos

Mods

4 Led's in the HW-9 taking only 5 MA when wired in series with a 2200 ohm 1/4 watt resistor.
A total of 20 MA to light the dial and meter.
The space between the front panel and the chassis here is very small so the tiny LED's are required to do the job .

@@ Line 1: / Line 1: @@
-This is a work in process - Gathering pieces.
+'''This is a work in process - Gathering pieces.'''
 [[File:HW-9.PNG]]
@@ Line 5: / Line 5: @@
 == Features ==
-* Replace HW-9 internal VFO with a digital VFO
+Replace HW-9 internal VFO with a digital VFO
-** HW-9 VFO has legendary issues
-*** Mechanical issues with vernier
+* HW-9 VFO has legendary issues
-*** Drift due to thermal
+** Mechanical issues with vernier
-*** Lack of resolution
+** Drift due to thermal
+** Lack of resolution
+** Backwards dial
 * Fits within HW-9 VFO Box
 * Controls Tx/Rx/BFO frequencies with rotary encoder
@@ Line 30: / Line 32: @@
 ** Low pass filters to turn square waves to sine waves
 ** 27 MHz crystal
+== Schematic ==
+[[File:VFO-001-SCHEMATIC.PNG]]
+== Connections to Radio ==
+* RIT pot
+** Connects to Analog input
+*** Polled occasionally while in receive
+* Band switch
+** SW1 9V
+* T/R - transmit/receive
 == Parts ==
@@ Line 36: / Line 51: @@
 * [[STM32|Blue Pill Card]]
+[[File:STM32F103C8T6-Blue-Pill-Pin-Layout.gif]]
 * 3.3V operation work without level shifters for I2C
 ** OLED can run from 3.3V
@@ Line 47: / Line 65: @@
 === 128x32 OLED ===
+[[File:Si5351_003_720px.jpg]]
 * [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]
@@ Line 60: / Line 80: @@
 U8G2_SSD1306_128X32_UNIVISION_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);   // STM32, Ebay OLED
 </pre>
-* Font
+* [https://github.com/olikraus/u8g2/wiki/fntlistall List of Fonts]
 <pre>
    u8g2.setFont(u8g2_font_ncenB14_tr);
 </pre>
-* Hello World Code
+===== Hello World Code =====
 <pre>
 U8G2_SSD1306_128X32_UNIVISION_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);   // STM32, Ebay OLED
@@ Line 73: / Line 95: @@
 void loop(void) {
-   u8g2.clearBuffer();					// clear the internal memory
+   u8g2.clearBuffer();			// clear the internal memory
    u8g2.setFont(u8g2_font_ncenB08_tr);	// choose a suitable font
    u8g2.drawStr(0,10,"Hello World!");	// write something to the internal memory
-   u8g2.sendBuffer();					// transfer internal memory to the display
+   u8g2.sendBuffer();			// transfer internal memory to the display
    delay(1000);
 }
@@ Line 82: / Line 104: @@
 === Rotary Encoder/Breakout Board ===
+[[File:RotaryEncoderCAD.PNG]]
+[[File:Si5351_004_720px.jpg]]
 * Includes pushbutton Switch
 * Includes Pull-Up resistors
 * Needs R/C filter on output for debounce
+* [https://playground.arduino.cc/Main/RotaryEncoders/ Reading Rotary Encoders] - Arduino reference
 * [https://github.com/mprograms/SimpleRotary Simple Rotary Encoder Arduino library]
 * [http://www.mathertel.de/Arduino/RotaryEncoderLibrary.aspx Library for the Arduino environment for using a rotary encoder as an input]
-=== Si5351 FrequencyGenerator ===
+=== Si5351 Frequency Generator ===
+[[File:Si5351_001_720px.jpg]]
+[[File:VFO3.PNG]]
+* I2C Daisy-chain connector
 * 3 outputs
 ** Tx
-** Rx
+** Rx (may not need to use separate output)
-** BFO
+** BFO - could be adjusted
+[[File:Si5351_002_720px.jpg]]
+==== Measurements ====
 ==== VFO TX ====
-* From 5.9993-5.7493 MHz
+* 250 KHz range
+** 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
+* RIT knob is taken in through an A/D and adjusts the receive frequency plus/minus 1 KHz
 ==== BFO ====
@@ Line 108: / Line 146: @@
 * 8.8314 MHz in receive
 * 8.8307 MHz in transmit
+* 700 Hz difference but could be adjusted
 === Low Pass Filters ===
-* 6 MHz
+* Si5351 has square wave outputs
+* LP filter can be used to change squarewave into sinewave
+* [https://rf-tools.com/lc-filter/ LC Filters Design Tool] - calculator
+* [https://kitsandparts.com Kits and Parts dot Com]
+** [https://kitsandparts.com/lpf.1.5.php Build a 7-pole Universal Low Pass Filter for HF]
+** Butterworth
+** Replace with SMT card?
+[[File:LPF.1.5.sch.png]]
+[[File:LPF.1.5.pcb.png]]
 * [http://toroids.info/FT37-43.php Toroid Calculator]
-** [https://kitsandparts.com Kits and Parts dot Com]
 * [https://kitsandparts.com/PCBs/LPF/filter2.pdf A short guide to harmonic filter for QRP transmitter output]
+** [https://www.mouser.com/ProductDetail/Pulse-Electronics/PE-0805CLH1R5STS?qs=82jvyl5dHWdaYiLrQ038Kg%3D%3D PE-0805CLH1R5STS Example 1 uH inductor]
+** [https://www.mouser.com/Search/Refine?Keyword=PE-0805CLH Search PE inductors]
+** [https://www.mouser.com/Passive-Components/Inductors-Chokes-Coils/Fixed-Inductors/_/N-wpczZ1yzvvqx?P=1yzvlksZ1z0wqjdZ1z0woesZ1z0wrifZ1z0wri6Z1z0wrhxZ1z0wrhoZ1z0wrhfZ1z0wpbo&Ns=Pricing|0 Broader search]
+** [https://www.mouser.com/Passive-Components/Capacitors/Ceramic-Capacitors/_/N-5g8mZ1yzvvqx?P=1z0z7ymZ1yxboka&Rl=5g8mZer3vZ1z0x74kZ1z0x7xwSGT&Keyword=0805&Ns=Pricing|0 0805 caps C0G]
-== Schematic ==
-[[File:VFO-001-SCHEMATIC.PNG]]
+[[File:LCFilterValues.PNG]]
+* VFO and BFO frequencies are outside the bands (deliberately to void collisions)
+==== BFO Filter ====
+* 8.8314 MHz in receive
+* 8.8307 MHz in transmit
+[[File:BFO_Filter.PNG]]
-== Libraries ==
+[[File:BFO_Filter_IL.PNG]]
+== Libraries/Example Code ==
+* [https://github.com/land-boards/lb-Arduino-Code/tree/master/STM32/VFO_Si5351 Land Boards Application]
 * [https://github.com/pu2clr/VFO_BFO_OLED_ARDUINO VFO and BFO with Si5351A, OLED and Arduino]
 * [https://github.com/olikraus/u8g2 U8g2: Library for monochrome displays, version 2]
@@ Line 133: / Line 195: @@
 == Videos ==
+=== VFO Design ===
 <video type="youtube">58G5atwBX2M</video>
@@ Line 145: / Line 209: @@
 * [https://www.youtube.com/c/CharlieMorrisZL2CTM/videos Charlie Morris YouTube channel]
+=== Misc videos ===
+<video type="youtube">rPM1vvGorTo</video>
+=== Mods ===
+<video type="youtube">rABYJi0vm7g</video>
+* 4 Led's in the HW-9 taking only 5 MA when wired in series with a 2200 ohm 1/4 watt resistor.
+* A total of 20 MA to light the dial and meter.
+* The space between the front panel and the chassis here is very small so the tiny LED's are required to do the job .

Difference between revisions of "HW-9 VFO"

Latest revision as of 10:38, 30 October 2020

Contents

Features

Schematic

Connections to Radio

Parts

Blue Pill Card

128x32 OLED

Arduino Library for OLED

Hello World Code

Rotary Encoder/Breakout Board

Si5351 Frequency Generator

Measurements

VFO TX

VFO RX

BFO

Low Pass Filters

BFO Filter

Libraries/Example Code

Videos

VFO Design

Misc videos

Mods

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