Davac4

Davac 4.2 OK1ZIA

Davac 4.2 is updated version of Davac 4.1. It is opto-isolated interface between PC and radio. Supports CW and SSB CQ, band recording. Radio modulation comes from microphone or soundcard.

Davac 4.2 PCB model

Davac 4.2 box model

Features

• Simple assembly
• Most possible parts are SMD, except too expensive or unobtainable ones
• Designed for SMD reflow
• 3.5 jacks
• 3D printed box
• SMD LEDs + light guides on front panel
• power supply from USB
• pin header for band switching
• nice logo on PCB and box :-)
• radio-specific cables for different radios

Circuit diagram

Circuit diagram of Davac 4.2

PCB

• 
  PCB top/THT side
• 
  PCB bottom/SMD side

Gerber files to order PCB at jlcpcb.com.

Box

STL files for 3D printer.

Recommendations:

• Nozzle 0.4mm
• No support, no brim
• Layer height - first 0.3mm, others 0.2mm
• PETG
• Slow first layer for top side (8mm/s)

Print takes about 5-6 hours.

Light guides are made from transparent PETG filament.

Parts

Transformer TR-1/1 www.tme.eu

Jack 6.35 K3606D www.gme.cz or K36092B

White connectors for cable pins

Black connectors for cable flat cable

Program the FT232R

As default, the FT232R acts as serial port. But Tucnak uses Libftdi to access it in bitbang mode. Default VID:PID must be changed to distinguish Davac from other USB serial ports.

Linux

Use original ft232r_prog or modified ft_prog, contains statically linked x86_64 binary.

Usage:

# ft232r_prog --new-vid 0xa600 --new-pid 0xe110 --manufacturer OK1ZIA --product 'Davac 4.2'
...
Rewriting eeprom with new contents.

Now replug the device

# lsusb
...
Bus 002 Device 007: ID a600:e110 Asix OK1ZIA Davac 4.x
#

(texts are not same, they origins from lsusb database)

In the case of mistake, use --old-vid and --old-pid. AFAIK this can be used also to fix fake FT232 bricked by Windows FTDI drivers.

Windows

MProg with loaded Davac4.ept

Under Windows, use MProg. Download File:Davac4.ept and open it in MProg. Note on Windows XP you need D2XX drivers; on newer versions they are installed automatically.

Unplug all other FTDI devices and press the Program All Existing Devices button.

Install USB drivers

Linux

You have nothing to do, It will work automatically. Only on specific distributions you may have to set permissions to USB device, which is normally done by udev script.

Windows

Zadig with Davac4

Under Windows 7 or newer, use Zadig. On XP use 2.2.

Click Options, List All Devices.

Choose WinUSB and press Install Driver.