Kantronics KPC-2 - Interfacing Hand-Held Radios

Pin
3
-
Push-To-Talk
-
brown
lead.
This
line
controls
the
PTT
line
in
your
transceiver,
allowing
the
computer
to
switch
the
transceiver
from/to
transmit
or
receive.
Connect
directly
to
the
PTT
line
of
the
mic-jack
connector.
(See
the
section
on
Interfacing
¿E
Pin4-Bluelead
-
KAM
same
as
pin
5.
KPC-4,
both
ports,
same
as
pin
5.
KPC-2
same
as
pin
6.
KPC-2400
has
no
connection.
Pin
5
-
Audio
Signal
-
2
conductor
audio
cable,
center
conductor
and
9-wire
cable,
purple
conductor.
This
line
is
prewired
for
your
use
as
the
audio
input
from
your
.
transceiver
external
speaker
jack.
Do
not
use
a
headphone
output
from
the
transceiver.
If
you
use
an
accessory
or
phone
patch
output,
it
may
be
necessary
to
provide
a
padding
network
to
reduce
amplitude
of
the
signal
being
fed
to
the
TNC.
High
level
fixed
outputs
may
have
a
tendency
to
"swamp"
the
TNC
input
circuits.
Fixed
output
signals
in
excess
0250
mV
should
be
padded.
For
the
KAM
and
KPC-4
you
can
plug
this
lead
into
one
leg
of
the
Y-connector
cable
provided
in
the
TNC
accessory
bag.
Plug
the
Y-connector
cable
into
the
external
speaker
jack
of
the
transceiver.
The
remaining
female
connector
on
the
Y-connector
cable
may
be
used
for
an
external
speaker.
For
the
KPC-2
and
KPC-2400
the
audio
jack
on
the
back
panel
remains
available
for
attachment
of
an
external
speaker.
Pin
6
-
Ground/Shield
-
shield
of
9-wire
cable
and
shield
of
audio
cable.
Connect
the
push-to-talk
ground
and
AFSK
shield
to
this
line.
With
some
transceivers
which
do
not
reference
PTT
and
audio
shielding
to
a
common
ground,
it
may
be
necessary
to
leave
the
AFSK
shield
(braided
wire)
disconnected.
Note:
All
TNC
grounds
are
common.
Pin
7
-
KPC-4
Radio
Port
1
External
Reset
-
red
lead.
An
external
reset
line
is
provided
on
this
pin.
Applying
a
ground,
either
from
a
local
or
remote
source
is
the
same
as
turning
on
the
TNC.
This
is
only
on
the
KPC-4
Radio
Port
1.
Pin
7
-
+12VDC
in
-
red
lead.
This
lead
is
provided
as
an
alternate
power
input.
It
may
be
used
in
place
of
the
+2
VDC
jack.
If
you
do
not
plan
to
use
this
alternate
input
you
should
clip
the
wire
and
insulate
it.
This
lead
will
be
HOT
whenever
the
TNC
is
powered.
This
connection
should
not
be
used
to
power
any
accessory
device.
Note
that
on
the
KPC-4,
Radio
Port
2
has
+12
volts
on
this
pin
whereas
Radio
Port
1
does
not.
DO
NOT
INTERCHANGE
CABLES
CONNECTED
TO
THE
KPC-4
if
you
are
using
this
pin
on
either
port.
Pin
8
-
Green
lead
-
KAM
same
as
pin
6.
KPC-4
both
ports,
same
as
pin
6.
KPC-2
no
connection.
KPC-2400
no
connection.
Pin
9
-
Ground
-
Black
lead
-
same
as
pin
6.
46
CONNECT
RADIOS
ET
Version
3:0
Sept.
12,
1991
Q
Copyright
1989,
ge
=
Kantronics,
Inc.
All
Rights
Reserved.
Installation
Manual
plication
of
this
manual
or
the
firnware
without
permission
oí
Kantronics,
Inc.
is
prohibited.