Curtis Computer kb4900 - KB-4900 Operation Guide; CW Keyboard Operation

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Note:
Use shielded cable
{or all interconnections
between
the KB—4900
and other
units
including
the
keys.
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Always
connect
all the
transmitter
cables before
connecting
the
ac
line
to the KB~4900.
This
prevents problems
from
minute ac
leakage
from the
ac line
bypass capacitors
in the
KB—4900
Also,
make sure
the unit is
equipped
for the line
voltage you
are
using,
i.e.
either
117 DR 234 Vac.
Place
the "TUNE/DP/SELF—TEST"
switch
in
"SELF-TEST"
until
you
are
ready
to
go
on the
air. "SELF—TEST"
disables
the
keyline
and
PTT
relays.
CW KEYBOARD:
Connect
the
keyline
of
your
transmitter
to the
jack
marked "XMTR“ on
the rear of
the KB—4900. Connect
the PTT
line of
your
transmitter
to
the
jack
marked
"PTT" on the rear
of the
KB—4?00 (or
you
may
use
a
separate
hand or
foot switch
for PTT as
some
operators
prefer).
Connect
a
paddle key
and a manual
key
to the
respective
jacks
on the
rear
o4 the unit if
you plan
to use them.
Set
the SPEED control
at
midrange.
the WEIGHT
control at full
CCN,
the
pitch
and
volume controls at
midrange
{or
start-up
unless
you
have
already
set them where
you
like. Use the
HEIGHT control
very
sparingly
ii at
all. It is
normally
used
only
at
speeds
up
to about 20
Hpm
except
to
compensate
for slow
acting
transmitter
keying.
Use of
more than a
very
slight
weight
addition is
not a mark
of excellent
operating practice
and
Mr. Horse
didn’t intend it. But it
will
smooth—up
slow
speed
transmission
a
bit.
Connect a cable
from the 8 ohm audio
output
of
the receiver to the
jack
marked “RCVR” on the
rear of the
KB—4?O0 if
you
intend
to use
the "SPKR”
jack
of the
KB—49OO to listen
to mixed sidetone
and
receiver
audio. Note
that the RCVR and SPKR
jacks
are
simply
connected
in
parallel.
The KB—4900
comes on in the cw
mode. To
go
to the Cu mode from
either the Baudot
or ASCII
mode, thpe
CTRL-1. If in the
random
practice
modes, press
the
SYSTEM RESET switch.
Set
the desired
speed by
either
sending
characters
and
adjusting
as
you
listen or
type
CTRL-B
and
adjust
the SPEED
pot
until
the
desired
speed
is
read on the
speed
meter. Press the
SPACE
key
to
release
from this mode.
Preset
the time and serial number
if desired
by
referring
to the
GENERAL
DPERATIDN
section.
Similarly,
preload
the
message
memories
as described in
the GENERAL DPERATIDN
section.
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