PacComm TINY-2 - Page 129

RADIO
INTERFACING
Extermal
Interlace
Cox.
Direct
Connection
to
Microphone
and
Speaker
The
packet
controller
was
designed
to
allow
hookup
and
testing
to
be
done
without
any
modifications
to
the
radio
or
any
signal
level
bafanc-
ing
devices
in
the
cables.
The
direct
interconnection
method
is
useful
if
you
devote
the
radio
exclusively
to
packet.
If
you
share
the
radio
between
packet
and
voice,
you
may
want
to
use
the
external
interface
method
below.
The
packet
controller's
audio
signals
are
fed
directly
into
the
microphone
connector
or
similar
auxiliary
input
of
the
radio,
and
the
TINY-2/MICRO-2
output
is
adjusted
to
give
a
proper
modula-
tion
level.
The
receiver
audio
is
taken
from
an
auxiliary
audio
output
or
speaker
jack
and
fed
directly
to
the
packet
controller.
Accessory
Jack
Connection
ifthe
radio
has
an
accessory
jack
with
PTT,
transmit
audio,
and
receive
audio
signals,
all
connections
between
the
radio
and
TINY-2/MICRO-2
may
be
done
through
this
jack.
The
TINY-2/MiICRO-2
is
designed
to
operate
with
from
10
to
700
millivolt
audio
input.
This
is
compatible
with
the
signal
tevel
provided
by
most
modern
transceivers
at
the
“Fixed
Audio
Output"
connector
on
the
rear
panel.
It
is
recommended
that
a
squelched
fixed
audio
output
be
used
if
available.
if
the
audio
output
is
squelched
or
can
be
adjusted
to
a
low
enough
level
to
prevent
false
carrier
detection,
a
direct
connection
to
the
TINY-2/MICRO-2
audio
input
may
be
made.
External
Interface
Box.
8
If
you
desire
to
use
the
radio
for
both
packet
and
voice,
and
the
radio
does
not
have
an
accessory
jack
and
you
don't
wish
to
add
a
connector
to
the
radio,
you
should
construct
a
separate
interface
box
to
permit
simuttaneous
connection
of
the
TINY-2/MICRO-2
and
a
microphone.
it
may
either
have
its
own
speaker
or
pass
the
signal
through
to
a
speaker
so
that
you
can
monitor
the
receive
audio
while
the
packet
controller
is
hooked
up.
A
schematic
of
an
extemal
interface
box
is
shown
below.
INTERFACE
BOX
RADIO
External
Interface
Circuit
Schematic
TINY-2/MICRO-2
Technical
Ref.,
2
Ed
©
1989,
PacComm,
Inc.