
50
Time code (optional)
Principle of Operation
The Board GPS170 has been designed for the generation of IRIG, AFNOR and
IEEE1344 standard time codes. Apart from the digitally generated amplitude-modula-
ted code, it also provides the unmodulated DC-Level shift code. The modulated sine
wave carrier and the board´s internal time pattern are derived from the radio clock´s
disciplined oscillator.
Block Diagram Time code
microcontroller
modulator
EPLD
D/A converter
driver
50 unbalanced
Ω
digital
sinewave
generator
timecode
10 MHz
modulated timecode
unmodulated timecodes
high- and low-active
PPS
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