Rev 1.9.1 Feb.09
Proprietary and Confidential
39
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.
RF connection
When
attaching
an
antenna
to
the
module:
Note: To disconnect the
antenna, make sure you use the
Hirose U.FL connector removal
tool (P/N UFL-LP-N-2(01)) to
prevent damage to the module
or coaxial cable assembly.
•
Use
a
Hirose
U.FL
connector
(model
U.FL
#CL331
‐
0471
‐
0
‐
10)
to
attach
an
antenna
to
a
connection
point
on
the
module,
as
shown
in
(the
main
RF
connector
on
the
top
side;
the
diversity
RF
or
GPS
connector
on
the
bottom
side).
•
Match
coaxial
connections
between
the
module
and
the
antenna
to
50
Ω.
•
Minimize
RF
cable
losses
to
the
antenna;
the
recommended
maximum
cable
loss
for
antenna
cabling
is
0.5
dB.
Figure 3-1: Antenna connection points and mounting holes
Ground connection
When
connecting
the
module
to
system
ground:
•
Prevent
noise
leakage
by
establishing
a
very
good
ground
connection
to
the
module
through
the
host
connector.
•
Connect
to
system
ground
using
the
two
mounting
holes
at
the
top
of
the
module
(as
shown
in
).
•
Minimize
ground
noise
leakage
into
the
RF.
Depending
on
the
host
board
design,
noise
could
potentially
be
coupled
to
the
module
from
the
host
board.
This
is
