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RTTY on the Air

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    Volumes

    1. Vol 1 RTTY on the Air — Vol 1: Two Tones on the Air Take the teletype's five-bit code off the wire and put it on a radio wave, and you have RTTY. It comes down to two audio tones 170 Hz apart — and one detail about sidebands that has confused hams for seventy years.
    2. Vol 2 RTTY on the Air — Vol 2: The Terminal Unit and the Crossed Bananas Between the receiver and the teleprinter sat a box of filters that turned two wobbling tones back into text — and a little green oscilloscope you tuned by watching two glowing ellipses cross. This is the craft of running RTTY.