When
it
is
first
powered
on,
the
OpenTracker
will
always
start
out
using
the
Config
1
profile.
After
startup,
profile
selection
depends
on
the
settings
in
the
lower
‐
left
pane
of
the
configuration
window.
The
conditions
to
test
are
selected
using
the
checkboxes
to
the
left
of
each
condition.
The
com
‐
parison
can
be
either
‘>’
(greater
than)
or
‘<=’
(less
than
or
equal
to).
Clicking
on
the
button
showing
the
comparison
operator
toggles
it
between
these
two
settings.
The
Altitude
and
Speed
values
are
compared
with
those
indicated
by
the
GPS.
Onboard
sensors
provide
readings
for
comparison
with
the
Temperature
and
Voltage
fields.
ADC
Input
refers
to
the
unused
analog
‐
to
‐
digital
converter
input
on
JP8.
The
possible
values
are
0
to
255,
corresponding
to
a
range
of
0
to
5
volts.
The
jumper
setting
refers
to
JP3.
Installing
a
jumper
between
pins
JP2
and
JP3
sets
the
‘On’
condition.
The
GPS
Fix
is
considered
invalid
if
it
has
been
more
than
20
seconds
since
the
last
valid
position
was
received
from
the
GPS
unit.
The
selected
tests
are
run
once
every
second.
If
the
conditions
are
met,
the
new
profile
is
loaded.
If
Transmit
when
switching
to
this
profile
is
checked
in
the
new
profile,
a
packet
is
transmitted
immediately.
Once
the
switch
to
the
new
profile
has
been
made,
the
criteria
in
the
new
profile
take
effect.
Another
switch
will
not
occur
until
the
new
criteria
are
met
.
Often,
the
criteria
in
each
profile
will
be
complementary.
For
example,
Config
1
might
indicate
a
switch
when
the
jumper
is
installed,
and
Config
2
would
indicate
a
switch
when
the
jumper
is
removed.
However,
the
criteria
may
be
completely
independent
of
each
other.
If
the
criteria
in
both
profiles
are
met
at
the
same
time,
the
configuration
will
swap
every
second.
Keep
in
mind
that
there
may
be
a
certain
amount
of
noise
or
jitter
on
analog
inputs
such
as
voltage
and
temperature.
Loading
and
Saving
Settings
After
changing
any
configuration
options,
you
must
click
the
‘Write’
button
to
write
the
changes
to
the
tracker’s
firmware.
You
may
also
use
the
‘Save
to
File’
button
to
save
the
configuration
options
to
a
file,
which
can
be
loaded
later
using
the
‘Load
from
File’
button.
Basic
Configuration
Options
Callsign
–
The
radio
callsign
to
use
when
transmitting.
Tactical
callsigns
may
be
used,
but
FCC
and
ITU
rules
require
periodic
identification.
If
the
actual
callsign
is
not
used
here,
be
sure
to
include
it
in
the
comment
field.
Path
–
This
specifies
the
digipeater
path
to
use.
Specific
callsigns
may
be
entered
(e.g.,
‘K6SYV
‐
10,
K6TZ
‐
10’)
but
for
APRS
operation
a
set
of
common
aliases
are
usually
used.
A
OpenTracker Manual - Version 1.05 – 6/25/06
page
10
of
23
