NU_MTB200_001_05112013_EN
Date: 05.11.2013 Page 8 / 14
diode pre-installed internal to the relay itself. If the relay has this diode,
insure the proper relay polarity connected is used. If this diode is not
internal, it should be externally. A common diode such as a 1N4004 will work
in most circumstances.
2
2
.
.
8
8
.
.
E
E
x
x
t
t
e
e
r
r
n
n
a
a
l
l
G
G
P
P
S
S
a
a
n
n
t
t
e
e
n
n
n
n
a
a
s
s
p
p
e
e
c
c
i
i
f
f
i
i
c
c
a
a
t
t
i
i
o
o
n
n
There is a MMCX RF connector on MTB200 and it is for external GPS antenna.
The specification of the external GPS antenna is listed in following table.
GPS antenna
Frequency: 1575.42MHz
Bandwidth
>5MHz
Beamwidth
>120°
Supply voltage
3.3V
Polarization
RHCP or Linear
Passive
0dBi min.
Gain
Active
15dB
Impedance
50Ω
VSWR
<2
Noise figure
<3
Connector
MMCX
3
3
.
.
0
0
.
.
G
G
e
e
t
t
t
t
i
i
n
n
g
g
S
S
t
t
a
a
r
r
t
t
e
e
d
d
3
3
.
.
1
1
.
.
P
P
a
a
r
r
t
t
L
L
i
i
s
s
t
t
Name
Remark
Picture
MTB200
The GSM/GPRS/GPS
locator
