Kantronics KPC-4 - Page 52

Miscellaneous Information
Typically,
in
RTTY
and
ASCII
operation,
speed
of
transmission
is
specified
in
BAUD
rather
than
words-per-minute.
A
chart
of
the
comparison
between
these
two
is
provided
below.
BAUD WPM
45 60
50 67
57 75
75 100
100 132
110 147
150 200
200 267
300 400
You
may
set
any
desired
baud
rate,
in
1
baud
increments,
from
20
baud
up
toa
maximum
of
500
baud.
However,
HF
operation
below
28
MHz
is
limited
to
300
baud.
RTTY
and
ASCII
signals
are
sent
by
transmitting
two
different
tones, called
MARK
and
SPACE.
The
difference
between
these
two
signal
frequencies
is
referred
to
as
the
SHIFT.
Standard
shifts
employed
in
amateur
RTTY
communication
are
170
Hz,
425
Hz,
and
850
Hz.
The
KAM
supports
all
of
these
shifts
as
pre-programmed
shifts,
but
also
supports
the
selection
of
any
desired
shift
through
the
use
of
the
SHIFT
command.
If
this
is
set
to
MODEM,
the
KAM
will
generate
the
MARK
and
SPACE
tones
which
are
specified
by
the
MARK
and
SPACE
commands.
This
would
allow
the
use
of
non-standard
shifts
or
non-standard
frequency
pairs
if
desired.
Once
you
have
entered
either
the
RTTY
or
ASCII
Mode,
the
shift
may
be
changed
by
using
the
Ctrl-C
S
directive.
This
will
sequentially
step
through
the
available
shifts
—
170,
425,
850,
and
MODEM.
Initially,
the
KAM
will
enter
the
RTTY
or
ASCII
Mode
using
the
shift
set
in
the
SHIFT
command.
Pressing
the
Ctrl-C
S
directive
would
change
the
shift
and
display
a
message
showing
the
new
shift:
-425 SHIFT-
GA:
A
==
ee
ee
š
©
Copyright
1989,
Kantronics,
Inc.
All
Rights
Reserved.
Version
2.85
Duplication
of
this
manual
or
the
firmware
without
Operations
Manual
permission
of
Kantronics,
Inc.
is
prohibited.