AEA COMPUTER PATCH CP-1 Instruction Manual page 13

operation. The stop bit indicates the end of the operation (character)
and sets the machines up for the next character. Since both RTTY
Baudot and RTTY ASCII are teletype sent over a radio, technically
both are RTTY. However, RTTY Baudot is usually referred to as RTTY
and RTTY ASCII is referred to as ASCII. In this manual when we say
RTTY we mean both Baudot and ASCII. This may sound a bit
confusing, but if you just remember that both are 'radio teletype' that
are made up of different codes; you should not remain confused for
too long. Most amateurs you find w ill be running 60 wpm (45 baud). (A
baud is defined as the number of pulses per second). The North
American standard is to use mark as 2125 and space as 2295 (for a shift
of 170 Hz). Generally, a good place to find RTTY/ASCII signals is on
the 20 meter band between 14.080 and 14.100. The best thing to do is
listen in on some QSO's in action and see how they operate before
getting on the air yourself. To do this with the CP-1 you must use lower
sideband and use AFSK (Audio Frequency Shift Keying). You who
have a rig with a RTTY position on your mode switch may want to use
FSK (Frequency Shift Keying). The CP-1 is set up fo r AFSK, however,
you can modify it to do FSK (see Appendix D). The CP-1 has an
internal AFSK generator. This is called the modulator. It generates the
two-tone signal upon command. This signal is then fed to yo ur
m icrophone input on your transceiver.