2 layers19 × 76 mm
Sub
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
15 parts3kApache-2.0
2 layers40 × 37 mm
Data Mode Radio Cable
mpentler/k0rx-interface-pcb4A PCB implementation of an audio data mode interface designed by K0RX, David Andersen
- Size
- 40 × 37 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 15
- Nets
- 13
- Pads
- 35
- Tracks, vias
- 31, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 22 May 2021
- Updated
- 8 May 2023
Overview
Data Mode Radio Cable is an open-source printed circuit board by mpentler, from the mpentler/k0rx-interface-pcb repository on GitHub, published under the MIT licence. It is a 2-layer board of 40 × 37 mm with 15 parts on 13 nets, routed with 31 tracks and 0 vias.
Its parts include 4 connectors, 3 resistors, 1 capacitor, 1 IC and 1 switch. It belongs with the radio and wireless boards of this library.
README
README.mdk0rx-interface-pcb
A PCB implementation of an audio data mode interface designed by K0RX, David Andersen
Original circuit here: https://k0rx.com/blog/2017/11/baofeng.html
I made this up into a small 4x4cm PCB to replace a horrible stripboard prototype. I'm releasing the Gerber files and the KiCad project in case anyone wants to have a play. The project has now been upgraded to be compatible with KiCad V6, but some things may need reconnecting. Sorry. Same for V7.
There are more complex interfaces available to make or buy but I loved the simplicity of David's design. A small enclosure could be made for a box, and I've included an example of this in FreeCAD format also.
I had to change some resistors in my implementation as David mentions, and I totally missed out the potentiometer, opting for a single 2k2 resistor (edit 2023: my output is way hot - clearly needs the resistor value increasing). I also added a hard switch for toggling Tx/Rx as well as the optocoupler. I am only using a single audio channel as David does, so you can either leave the other one hanging or send to ground I guess. The Rx resistor may need some adjustment, see what level works for you (breadboard it and test, perhaps). I will change this to potentiometers for a V3 as different radios and PCs can vary wildly in level.
An improvement you may want to add is a proper connector for the radio cable rather than cutting the end off a cable and soldering it directly. Especially if mounting it in a box.
This interface works great for me for SSTV & APRS work and for general audio recording from the radio. The total cost of all of the parts (including PCB fabbing from JLCPCB) is around £15, the most expensive parts being the cables.
Parts List
- R1 - High value for receive audio, typically 62k-100k Ohm
- R2 - 2.2k Ohm for transmit audio (this may need to be higher also, again, experimentation is useful)
- R3 - 330 Ohm
- C1 - 0.1uF ceramic capacitor
- T1 - 1:1 600 Ohm transformer
- U1 - PC817 Optocoupler to pull PTT to GND
- SW1 - SPDT slide switch for hard TX/RX switching
- J1 - TRRS jack socket
- J2 - Pin header or bare pads - Audio out, GND
- J3 - Pin header or bare pads - Audio in, PTT
- J4 - Pin header or bare pads - RS232
Parts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | 0.1uF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C1 |
| 1 | 100k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 2.5mm | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | 3.3k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 3.5mm | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J3 |
| 1 | 330 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 600R | Library:1-1_Audio_Transformer_600_ohm | T1 |
| 1 | PC817 | Package_DIP:DIP-4_W7.62mm | U1 |
| 1 | PTT_LOCK | Library:SPDT_Right_Angled_Switch | SW1 |
| 1 | RS232 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J4 |
| 1 | TRRS | Library:TRRS-PJ-320A | J1 |
The 11 most common of 15 parts.
Questions
How big is the Data Mode Radio Cable PCB?
It measures 40 × 37 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Data Mode Radio Cable use?
15 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Data Mode Radio Cable KiCad files?
From the mpentler/k0rx-interface-pcb repository on GitHub, at the commit this page was made from: the board is KiCad Project/Data Mode Radio Cable.kicad_pcb and its schematic KiCad Project/Data Mode Radio Cable.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Data Mode Radio Cable design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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