PacComm TINY-2 - Radio Interfacing Procedures

RADIO
INTERFACING
Radio
Connector
(J2)
Pin
Definitions
RADIO
INTERFACING
This
section
describes
how
to
connect
the
signal
cable
between
the
TINY-2/MIGRO-2
and
the
radio.
The
interconnection
should
be
planned
so
as
to
minimize
pickup
of
stray
audio
and
RF
noise
by
the
lines.
You
should
use
shielded
wire
for
afl
signal-carrying
leads.
Read
the
remainder
of
this
chapter
carefully
before
starting
to
interface
the
packet
controller
to
the
radio.
Connect
the
TINY-2/MICRO-2
and
radio
according
to
one
of
the
following
methods.
Then
tum
on
the
packet
controller
and
computer
and
start
the
computer
communications
program.
Connect
the
radio
to
a
dummy
load
and
listen
to
the
transmission
with
another
nearby
radio.
Set
the
transmit
level
by
the
procedure
in
the
Adjustments
hapter.
You
should
use
shielded
wire
for
all
signal-carrying
leads.
If
you
notice
a
significant
hum
level
in
the
monitored
audio,
take
measures
to
remove
it.
If
the
transmitter
has
an
adjustable
microphone
gain
control,
try
reducing
the
sensitivity
of
the
transmitter
microphone
circuit
and
increasing
the
signal
level
from
the
TINY-2/MICRO-2
to
minimize
hum
or
other
noise
problems.
Radio
Connector
(J2)
Pin
Definitions
Interfacing
the
TINY-2/MICRO-2
to
a
radio
involves
connecting
the
following
signals
at
J2,
the
five
pin
DIN
connector.
*
Pin
4
-
Audio
output
from
the
TINY-2/MICRO-2
to
the
transmitter.
«
Pin
2-
Ground
for
both
audio
and
PTT.
*
Pin
3
-
Push-to-talk
to
allow
keying
the
transmitter.
+
Pin
4-
Receive
audio
from
the
receiver
speaker
or
auxiliary
jack
to
the
TINY-2/MICRO-2.
+
Pin
5
-
Optional
Radio
Squelch
input
for
RF
Carrier
Detection.
Pin
3
-
Radio
Keying
Line
-
PTT
Pin
1
-
Transmit
Audio
to
Radio
Pin
4
-
Receive
Audio
from
Radio
Pin
5
-
Radio
Squeich
(RF
DCD)
:
Radio
Connector
Viewed
from
Rear
of
Packet
Controller
on
TINY-2/MICRO-2
Technical
Ref.,
2
Ed
©
1989,
PacComm,
Inc.
7