Local CW keyer for remote keying

This revision is from 2014/04/19 19:00. You can Restore it.

Principle - arduino keyer identifies the played characters (enabled echo feature in K3NG code) and sending to server for playing with other hardware of the cw keyer or cw daemon (contains RemoteQTH server for Raspberry PI). This configuration is resistant to change internet latency during transmission, because not transmitted separately each dit/dash, but the entire ASCII character that perfectly transmiting the server side.

Main functions:

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Configure

Enable serial CLI echo as default in K3NG firmware. Find this line

byte cli_paddle_echo = 0;

and set from 0 to 1

byte cli_paddle_echo = 1;

Plug&play connecting in Linux

Udev rules

vim /etc/udev/rules.d/99-remoteqth.rules

SUBSYSTEM=="tty", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", ATTRS{serial}=="A702R984", SYMLINK+="ttyCW0", RUN+="/etc/cw.sh"

Connection script /etc/cw.sh

#!/bin/bash
# PUBLIC-IP
SERVER=192.168.1.1  # IP YOUR SERVER
CWDPORT=6789
killall socat
sleep 3
socat UDP:$SERVER:$CWDPORT /dev/ttyCW0,raw,echo=0 &
exit 0

Assembly

Circuit diagram

  • Jumper JP1 choose output between headphone and external out on P1
  • K1 prepared for connection CW speed potentiometer
  • RV1 set CW sidetone volume
  • RV2 preset LCD contrast

✔ Components

❏ Solder J2, D1, D2

❏ All parts of backside (C1 sign wrong polarity on PCB)

❏ J1, four TACT switch

❏ LCD

❏ Insert Arduino Nano


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