1:00
Please enable Javscript
Test tone, sine wave at 250hz for 60 seconds at -12db, loop
Please enable Javscript
0:12
Please enable Javscript
Radio, tune to a station
Please enable Javscript
0:01
Please enable Javscript
Morse code with a weak signal, letter "w"
Please enable Javscript
1:00
Please enable Javscript
Test tone, sine wave at 125hz for 60 seconds at -12db, loop
Please enable Javscript
1:00
Please enable Javscript
Test tone, brown noise, 60 seconds -12db, loop
Please enable Javscript
0:01
Please enable Javscript
Morse code with a weak signal, number eight
Please enable Javscript
0:01
Please enable Javscript
Morse code letter "t"
Please enable Javscript
0:01
Please enable Javscript
Morse code letter "n"
Please enable Javscript
1:00
Please enable Javscript
Test tone, sine wave at 440hz for 60 seconds at -12db, loop
Please enable Javscript
0:02
Please enable Javscript
Snow shovel slush
Please enable Javscript
0:01
Please enable Javscript
Electronic and digital clicks.
Please enable Javscript
1:40
Please enable Javscript
Hum and fan of a drinking fountain.
Please enable Javscript
0:01
Please enable Javscript
Saw cuts through wood hard
Please enable Javscript
0:01
Please enable Javscript
Morse code with a weak signal, number four
Please enable Javscript
0:02
Please enable Javscript
Typewriter typing
Please enable Javscript
1:00
Please enable Javscript
Test tone, sine wave at 500hz for 60 seconds at -12db, loop
Please enable Javscript
0:01
Please enable Javscript
Morse code letter "w"
Please enable Javscript
1:00
Please enable Javscript
Test tone, pink noise -12db loop
Please enable Javscript
1:00
Please enable Javscript
Test tone, sine wave at 12.5khz for 60 seconds at -12db, loop
Please enable Javscript
0:01
Please enable Javscript
Morse code letter "h"
Please enable Javscript