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Transmitt ing RTTY
For transmitting, th e keyboard is
hooked up to the FSK circuit in your
transmi tter vfo . When a key is pre ssed the
FSK circuit ke ys the vfo up an d down in
frequency with a definit e pattern corresponding
to the letter on the keyboard.
There are ma ny ways of doing this.
One way is to put th e keyboard in serie s
with the selector magnets. Then when a
key is press ed the loop curre nt is broken
up the same way as whe n the TV breaks up
the circuit on receiving. Th e loo p supply in
turn keys the FSK circuit.
Auto-Start
Some hams who have a net frequency
(mo stly on VHF) use a method called
Auto-Start , which can prove quite handy.
Suppose one person wants to send his
friend a message , and both are on a net
frequency . The friend leaves his receiver
and terminal unit on 24 hours a day. The
person who wants to send the message
sends a five-secon d, steady ma rk (21 25 Hz)
signal. The rec eiver on the other end picks
FIG UR E 2
FI GU RE 3
FIG URE 4
Figs. 2, 3, 4. RTTY scope p attern s.
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this up and the terminal unit which has a
special Auto-Start circuit in it automatically
turns on the motor in the teleprinter.
The sending station then sen ds the message.
At the end of the message he sends a
stead y five-second space signal (29 75 Hz)
to shut off the other station's teleprinter
motor. The sen ding statio n then turns off
his carrier. When the man returns fro m a
hard day at work he goes up to his sha ck
and reads wha t his friend has sent him
during the da y. He can reply in the same
manner .
Where to Get More Information
I suggest , for those interested in getting
more info on RTTY that they refer to
handbooks by 73 and CQ ma gazines. They
would also do well to get a co py of the
RTTY J ournal. It is put out by 'Du sty'
Dunn W8CQ , PO Box 837 , Royal Oak,
Michigan 48068. Subs crip tion rate is $3 a
yea r.
., WB2TCC-
82
73 MAGAZINE