Labels:text | screenshot | black and white | font OCR: -FREQUENCY-SHIFT KEYING OF A RADIO-FREQUENCY SIGNAL B-ON/OFF KEYING OF A RADIO-FREQUENCY SIGNAL* C-AUDIO-FREQUENCY-SHIFT KEYING OF AN OSCILLATOR TONE D-ON/OFF KEYING OF AN AUDIO-FREQUENCY SIGNAL A-RTTY B-IMAGE C-CW* D-PHONE -RTTYM B-IMAGE C-CW D-PHONE A-FREQUENCY-SHIFT KEYING OF A RADIO-FREQUENCY SIGNAL* B-ON/OFF KEYING OF A RADIO-FREQUENCY SIGNAL C-DIGITAL PULSE-CODE KEYING OF AN UNMODULATED CARRIER D-ON/OFF KEYING OF AN AUDIO-FREQUENCY SIGNAL -FM PHONEx B-IMAGE C-CW D-SINGLE-SIDEBAND PHONE -FM PHONE B-IMAGE C-CW D-SIDEBAND PHONE* A-THE MECHANICAL NOISE CAUSED BY CLOSING A STRAIGHT KEY TOO HARD B-THE CLICKING NOISE FROM EXCESSIVELY SQUARE CW KEYED WAVEFORM* -THE SOUND PRODUCED IN A RECEIVER FROM A CW SIGNAL FASTER THAN 20 WPM D-THE SOUND OF A CW SIGNAL BEING COPIED ON AN (AM) RECEIVER A-B ...
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