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Meinberg DCF77, Operating Instructions Manual

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Meinberg DCF77 Operating Instructions Manual Download Page 13

13

Technical specifications

RECEIVER:

Direct conversion quadrature receiver with automatic gain
control
Bandwidth: approx. 20 Hz

ANTENNA:

Active external ferrite antenna in a plastic case
Length of the cable: up to more than 100m

Standard:
BNC type connector, 5m of RG174 cable

Outdoor:
N type connector, RG58 cable

RF AMPLITUDE,
MODULATION:

Indicated by LED and on-screen by monitor program

TIMECODE
CHECK:

Parity and consistency checking over a period of two minutes
RF distortions indicated by both LED and a bit of the
status register
Without RF signal the clock runs on XTAL
with an accuracy of 10

-6

 (after 1 day of synchronization)

BATTERY
BACKUP:

Lithium battery or Gold Cap
when the computer is turned off, the on-board RTC keeps the
time based on XTAL for more than 10 years (lithium battery)
rsp. 150 hours (gold cap)

RELIABILITY OF
OPERATION:

Microprocessor supervisory circuit provides watchdog timer,
power supply monitoring and backup-battery switchover

SYSTEM BUS
INTERFACE:

Single lane (x1) PCI Express (PCIe) Interface
compatible to PCI Express specifications r1.0a

DATA FORMAT:

Binary, byte serial

Summary of Contents for DCF77

Page 1: ...Technical Information Operating Instructions DCF77 PEX511 ...

Page 2: ...Impressum Meinberg Funkuhren GmbH Co KG Lange Wand 9 D 31812 Bad Pyrmont Phone 49 52 81 9309 0 Fax 49 52 81 9309 30 Internet http www meinberg de Email info meinberg de September 02 2009 ...

Page 3: ...xpress PCIe 7 Block diagram PEX511 8 Connectors and LEDs in the rear panel 9 Pin assignments of the 9 pin connector 10 Installing the PEX511 in your computer 10 Aligning the antenna 11 Technical specifications 13 Firmware updates 15 Replacing the lithium battery 15 CE label 15 Format of the Meinberg Standard time string 16 ...

Page 4: ... s system time synchronous to the board time If the present delivered stick doesn t include a driver program for the operating system used it can be downloaded from http www meinberg de english sw On the USB stick there is a file called readme txt which helps installing the driver correctly ...

Page 5: ...nt a binary coding scheme using the short time mark for logical zeroes and the long time mark for logical ones The information on the current date and time as well as some parity and status bits can be decoded from the time marks of the 15th up to the 58th second every minute The absence of any time mark at the 59th second of a minute signals that a new minute will begin with the next time mark Ou...

Page 6: ...ty check passes too the buffered real time clock on the board is synchronized corre sponding to the decoded time and date Optionally the decoded date and time information can be converted to another time zone The time zone setting can be modified using the monitor program The current setting is saved permanently on the radio clock board Software running on the computer can read out the date time s...

Page 7: ...n slots with a higher lane width x4 x8 x16 y t i l i b a r e p o r e t n I y t i l i b a r e p o r e t n I y t i l i b a r e p o r e t n I y t i l i b a r e p o r e t n I y t i l i b a r e p o r e t n I t o l S t o l S t o l S t o l S t o l S 1 x1 x1 x1 x1 x 4 x4 x4 x4 x4 x 8 x8 x8 x8 x8 x 6 1 x 6 1 x 6 1 x 6 1 x 6 1 x d r a C d r a C d r a C d r a C d r a C 1 x1 x1 x1 x1 x s e Y s e Y s e Y s e Y...

Page 8: ...8 Block diagram PEX511 ...

Page 9: ...available via the monitor program The BSL button behind the hole in the slot cover activates the clock s boot strap loader This mode of operation is needed if the clock s firmware shall be updated The 9 pin sub D connector is wired to the radio clock s serial port Pin assignment can be seen from the figure beside This port can not be used as serial port for the computer Instead the clock uses the ...

Page 10: ...in RS 232 3 TxD out RS 232 4 P_MIN out TTL 5 5 GND 6 reserved 7 P_SEC out RS 232 3 8 P_SEC out TTL 4 9 reserved The signals which have no lever of the DIL switch assigned are hard wired to the pins of the connector All levers of the DIL switch which are not listed in the table are reserved and should remain in the OFF position Installing the PEX511 in your computer Every PCI Express board is a plu...

Page 11: ...on and field strength LEDs Like described in chapter General information about DCF77 undis turbed pulses per second except 59 second without any interfering pulses are required for corrcect decoding of the DCF77 time telegram Therefore a modulation LED blinking exactly once per second is a criterion for good receiption of the DCF signal Because PEX511 uses a quadrature demodulator as receive circu...

Page 12: ...12 The monitor program displays the following window modulation field strength acoustig modulation signal on off ...

Page 13: ...of two minutes RF distortions indicated by both LED and a bit of the status register Without RF signal the clock runs on XTAL with an accuracy of 10 6 after 1 day of synchronization BATTERY BACKUP Lithium battery or Gold Cap when the computer is turned off the on board RTC keeps the time based on XTAL for more than 10 years lithium battery rsp 150 hours gold cap RELIABILITY OF OPERATION Microproce...

Page 14: ... per second per minute after request received Output String Meinberg standard time string described below PULSE OUTPUTS Pulses every second PPS with TTL and RS232 level pulse duration 100 msec active high Pulses every minute PPM with TTL level pulse duration 100 msec active high POWER REQUIREMENT 3 3 V 150 mA 12 V 45 mA power supplies provided by PCI Express interface PHYSICAL DIMENSION low profil...

Page 15: ...n the contents of the flash memory so if the update procedure is interrupted it can easily be repeated The contents of the program memory will not be modified until the loader program has sent the command to erase the flash memory So if the button has been pressed accidentally the system will be ready to operate again after the computer has been turned off an the on again Replacing the lithium bat...

Page 16: ... hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second uv clock status characters u clock has not synchronized after reset space 20h clock has synchronized after reset v different for DCF77 or GPS receivers DCF77 clock currently runs on XTAL GPS receiver has not checked its position space 20h DCF77 clock is sync d with transmitter GPS receiver has determined its position x time zon...

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