PacComm TINY-2 - Page 136

ADJUSTMENTS
Transmit
Level
Setting
Baud
Rate
Setting
To
set
the
baud
rate
on
the
packet
controller,
remove
the
TINY-
2/MICRO-2
from
its
cabinet.
There
are
two
sets
of
jumper
headers
[DIP
switches]
along
the
front
edge
of
the
circuit
board
with
labels
of
3,
#2,
24,
48,
96,
and
19.2
for
both
TERMINAL
and
RADIO.
These
numbers
correspond
to
300,
1200,
2400,
4800,
9600,
or
19.200.
baud
rates.
Place
the
jumper
on
the
two
pins
[turn
the
section
of
the
DIP
switch
ON]
for
the
desired
rate
for
both
the
computer
and
radio
FWARNING:
Place
one
and
only
one.
jumper
for
the
computer}
iside,
and
only
one
on
the
radio
side.
[Only
one
switch
on
the}
[MICROPOWER-2
should
be
ON
per
section.]
:
Audio
Input
Level
/
The
TINY-2/MICRO-2
is
designed
to
operate
with
from
10
to
700
millivott
audio
input.
If
you
obtain
audio
from
the
headphone
or
external
speaker
jack
on
the
radio,
place
a
shorting
block
on
the
pins
of
JPR
(factory
defauit)
and
adjust
the
audio
level
to
approximately
20
mv
with
the
aid
of
a
high
impedance
voltmeter
or
oscilloscope.
It
no
such
measuring
equipment
is
available,
set
the
volume
control
at
a
position
below
that
normally
used.
If
direct
connection
is
made
to
the
radio’s
discriminator
(demodulator)
or
any
other
high
impedance
audio
source,
remove
the
shorting
block
romJPR.
-
OTE:
ie
audio
level
si
is
to
as
low
a
value
as
ssible
if
an
unsquelched
radio
is
used.
The
TINY-2/MICRO-2
iodem
will
show
false
DCD
indications
on
noise
if
the
audio
Transmit
Level
Setting
Connect
the
TINY-2/MICRO-2
and
radio
as
shown
in
the
radio
inter-
facing
chapter.
Turn
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.
The
output
level
is
set
by
adjusting
trimpot
R12
which
is
accessible
through
the
rear
panel
opening
marked
"TTL
Computer.”
+.
Enter
the
command
CAL
<CR>
and
the
letter
"K"
to
cause
the
TINY-2/MICRO-2
to
key
the
radio
with
a
steady
tone.
The
high
or
low
tone
is
selected
by
pressing
the
space
bar,
NOTE:
The
watchdog
timer
will
cause
the
PTT
circuit
to
reset
approximately
one
minute
after
the
«’
key
is
depressed.
If
you
need
a
longer
adjustment
time,
type
’Q’
«CRs
to
return
to
the
command
prompt
and
restart
the
procedure.
2.
With
the
TINY-2/MICRO-2
keying
the
transmitter
and
the
higher
frequency
tone
selected,
adjust
the
transmit
audio
level
trimpot
(R12)
while
observing
a
service
monitor
or
deviation
meter
tuned
to
the
transmitting
frequency.
Set
the
deviation
for
3
to
3.5
KHz
on
the
higher
pitched
tone
and
check
that
the
lower
tone
is
at
least
2.5
KHz
deviation.
ee
TINY-2/MICRO-2
Technical
Ref.,
2
Ed
©
1989,
PacComm,
Inc.
15