MPC OM-20000072 Manual Do Utilizador
20
MPC User Manual Rev 0D
Chapter 3
MPC Setup Considerations
3.2.1
10 MHz In and 10 MHz Out
There are two BNC connectors on the back of the MPC for 10 MHz In and 10 MHz Out. These two
connectors are looped using an RF Loop-Back connector. Therefore by default, the 10 MHz Oven
Controlled Crystal Oscillator (OCXO) in the MPC is looped back to the GPS receiver. The GPSCard
phase locks to the 5 or 10 MHz reference signal supplied to the rear panel 10 MHz port.
connectors are looped using an RF Loop-Back connector. Therefore by default, the 10 MHz Oven
Controlled Crystal Oscillator (OCXO) in the MPC is looped back to the GPS receiver. The GPSCard
phase locks to the 5 or 10 MHz reference signal supplied to the rear panel 10 MHz port.
The RF Loop-Back connector can be removed if you prefer to provide your own external oscillator
through the 10 MHz In connector. In this case, the EXTERNALCLOCK command, refer to Volume 2
of the OEM4 Users’ Guide and List Current Configuration on Page 63, allows you to set up an
external oscillator and its frequencies.
through the 10 MHz In connector. In this case, the EXTERNALCLOCK command, refer to Volume 2
of the OEM4 Users’ Guide and List Current Configuration on Page 63, allows you to set up an
external oscillator and its frequencies.
Figure 4 shows how the clock card and Euro4 card work together using the loop connector or using a
user-supplied external clock.
user-supplied external clock.
Figure 4: 10 MHz In/Out Data Flow
For further information on the signals or connector type for the 10 MHz In and 10 MHz Out ports,
please see Appendix A, Input/Output Connectors on Page 78.
please see Appendix A, Input/Output Connectors on Page 78.
3.2.2
DGPS
A data serial cable is needed to connect the MPC from the DGPS connector to an external device.
The Differential GPS (DGPS) communication port is bi-directional and factory configured for RS232.
It is typically used to communicate DGPS broadcast data to transmitting radio equipment.
It is typically used to communicate DGPS broadcast data to transmitting radio equipment.
For communication to occur, the MPC serial port configuration must match that of the external
10 MHz Oscillator
Fr
on
t P
a
on
t P
a
n
e
l of
t
t
h
e
M
P
P
C
Clock Card
GPSCard
10 MHz Out
10 MHz Out
10 MHz In
Optional
external
oscillator may
be used if loop
back connector
is removed.
external
oscillator may
be used if loop
back connector
is removed.
Optional user-
supplied
external
device may be
synchronized
with the MPC.
B
ack P
a
nel o
f t
h
e
M
P
P
C
Am
p
GPS Antenna
In
Oscillator LED, when
blue, indicates that the
internal OCXO is
powered on.
blue, indicates that the
internal OCXO is
powered on.
Antenna
F
requen
c
y
Contr
o
l
Power
On/Off
Control
1PPS Out