NuPower
TM
Mini
Multi
‐
Octave
PA
User
Manual
Rev
1.4
6
3.2
CONNECTING
A
PROPER
LOAD
TO
THE
ANTENNA
TERMINAL
To
prevent
damage
to
the
PA,
the
antenna
terminal
must
be
terminated
into
a
50
Ω
load.
Examples
of
a
proper
load
include:
Directly
connecting
to
an
antenna
specified
for
the
frequency
range
(225
MHz
to
2.6
GHz).
Connecting
to
an
inappropriate
antenna
may
result
in
damage
to
the
PA
module.
Connecting
to
a
proper
antenna
through
a
50
Ω
transmission
line
or
coaxial
cable.
Avoid
using
damaged
cables
or
corroded
connectors
while
attaching
the
unit
to
an
antenna.
Terminating
the
antenna
terminal
into
a
50
Ω
power
attenuator
with
minimum
20
dB
attenuation.
Connecting
to
a
load
capable
of
dissipating
the
RF
power
from
the
PA
module.
Loads
capable
of
handling
20
Watts
(min)
are
recommended.
3.3
POWERING
‐
UP
THE
MINI
MOPA
The
NuPower
Mini
MOPA
must
be
terminated
to
a
proper
load
before
power
is
applied.
Refer
to
Section
3.2
for
the
specifications
of
the
proper
load.
After
the
PA
is
properly
terminated,
the
interface
cable
can
be
connected
to
the
unit
and
power
can
be
applied.
The
PA
is
now
ready
for
operation.
3.4
TRANSMIT
TURN
‐
ON
TIME
Caution:
Do
not
apply
transmit
data
until
the
PA
module
is
at
full
power.
This
will
prevent
loss
of
data
at
the
beginning
of
a
message.
The
NuPower
Mini
MOPA
is
at
full
power
approximately
500
µS
after
the
RF
Enable
line
goes
low
(ground).
Therefore,
transmit
data
can
be
applied
to
the
input
after
500
µS
without
loss
of
data.
3.5
RF
OUTPUT
POWER
VS.
SUPPLY
VOLTAGE
Although
the
NuPower
Mini
MOPA
was
designed
for
+28
VDC
operation,
the
module
is
capable
of
providing
suitable
RF
power
output
over
a
broad
range
of
supply
voltages:
+9
VDC
to
+32
VDC.
3.6
POWER
BACK
‐
OFF
MODE
The
NuPower
Mini
MOPA
is
designed
to
allow
the
user
to
reduce,
or
“back
‐
off,”
the
output
power
in
support
of
linear
waveform
operation
or
to
trade
off
output
power
in
exchange
for
lower
power
consumption.
The
amount
of
power
back
‐
off
is
assuming
a
0
dBm
drive
level
to
the
PA
module.
Pins
7
&
9
on
the
CTRL/PWR
interface
connector
are
designated
to
allow
such
operation.
Table
5
depicts
the
pin
configurations
to
achieve
low,
medium,
and
high
back
‐
off
settings,
where
“N/C”
is
an
indication
to
leave
the
pin
floating
(i.e.
not
connected)
since
the
pin
is
tied
high
internally,
and
where
“GND”
means
grounding
the
pin.
Due
to
the
broadband
nature
of
the
unit,
the
amount
of
attenuation
is
an
approximation
for
each
respective
setting
as
shown
in
Table
5,
dependant
on
operational
frequency
and
other
factors,
including
unit
‐
to
‐
unit
power
variation.
