Here are some CW tips:
Use this to receive audio through mic jack and decode the cw signal:
arecord -f S16_LE -c1 -r48000 -D hw:CARD=Device,DEV=0 - | sox -t raw -esigned-integer -b16 -r 48000 - -esigned-integer -b16 -r 22050 -t raw - |multimon-ng -a MORSE_CW -t raw -
Use a command like this to receive and decode CW from an RTL2832U SDR:
rtl_fm -f <freq> -s 22050 -M wbfm | multimon-ng -a DTMF -t raw -
Use Powershell to make system speaker beep CW:
$frequency = 400
#frequency needs to be between 37 and 32767
$time = 200
$dot_duration = 100
$dash_duration = 300
$dot = '[console]::beep($frequency, $dot_duration)'
$dash = '[console]::beep($frequency, $dash_duration)'
$spacing = 0.1
$char_spacing = .3
$word_spacing = 0.7
$morse_rev_lookup = @{
".-"="A";
"-..."="B";
"-.-."= "C";
"-.."= "D";
"."= "E";
"..-."= "F";
"--."= "G";
"...."= "H";
".."= "I";
".---"= "J";
"-.-"= "K";
".-.."= "L";
"--"= "M";
"-."= "N";
"---"= "O";
".--."= "P";
"--.-"= "Q";
".-."= "R";
"..."= "S";
"-"= "T";
"..-"= "U";
"...-"= "V";
".--"= "W";
"-..-"= "X";
"-.--"= "Y";
"--.."= "Z";
".----"= "1";
"..---"= "2";
"...--"= "3";
"....-"= "4";
"....."= "5";
"-...."= "6";
"--..."= "7";
"---.."= "8";
"----."= "9";
"-----"= "0";
".-.-.-"= ".";
"--..--"= ";";
"..--.."= "?";
"-...-"= "==";
"-..-."= "/";
"---..."= "=";
"-....-"= "-";
"..--.-"= "_"
}
$morse_lookup = @{}
foreach($k in $morse_rev_lookup.Keys){
$morse_lookup.add($morse_rev_lookup[$k], $k)
}
$someinput = [Environment]::UserName
$chararr = $someinput.ToCharArray()
foreach($k in $chararr){
if( $morse_lookup[$k -join ""] ){
Write-Host $k, ":", $morse_lookup[$k -join ""]
$letter = $morse_lookup[$k -join ""].ToCharArray()
foreach($l in $letter){
if($l -eq "."){
Invoke-Expression $dot
}else{
Invoke-Expression $dash
}
sleep($spacing)
}
sleep($char_spacing)
}else{
sleep($word_spacing)
}
}
