Meinberg GPS167PC - Manual (Page 11)

11
Configuring the 9 pin Connector
By default only the signals needed for the serial port COM0 are mapped to the pins of
the connector. Whenever one of the additional signals shall be used, the signal must be
mapped to a pin by putting the appropriate lever of switch DIL2 in the ON position.
The table below shows the pin assignments for the connector and the DIL switch lever
assigned to each of the signals. Care must be taken when mapping a signal to Pin 4 of
the connector. Only one of the switch levers 5 or 10 may be put in the ON position to
connect the pulse per minute or the 10MHz standard frequency to the jack. Those
signals which do not have a lever of the DIL switch assigned are always available at
the connector:
Pin Signal DIL2
1 +5V 1
2 RxD -
3 TxD -
4 P_MIN 5
4 10MHz 10
5 GND -
6 CAP0 2
7 CAP1 3
8 P_SEC 4
9 DCF_OUT 6
Mounting the Board
The computer has to be turned off and its case must be opened. The radio clock can be
installed in any ISA slot not used yet. The rear slot cover must be removed before the
board can be carefully plugged in. The computer´s case should be closed again and the
antenna can be connected to the coaxial plug at the clock's rear slot cover. After the
computer has been restarted, the monitor software can be run in order to check the
clock's configuration.
Mounting the Antenna
The GPS satellites are not stationary but circle round the globe in a period of about 12
hours. They can only be received if no building is in the line-of-sight from the antenna
to the satellite, so the antenna/converter unit must be installed in a location from which
as much of the sky as possible can be seen. The unit can be mounted using a pole with
a diameter up to 60 mm. A standard coaxial cable with 50 ohms impedance (e.g.
RG58) should be used to connect the antenna/converter unit to the receiver. Cable
thinner than RG58 should be avoided due to its higher DC resistance and RF attenuati-
on. When using the optional antenna diplexer the total length of one antenna line