CXR 54500-16, Руководство пользователя, Страница: 75 / 214

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CXR Larus 80-100-400 Issue 2 July 2006 page
3-36
Recovered clock from 54512-4 input cards, nominal 2.048 MHz; tracks
within ±10.2 x 10
-2
Hz.
c. 2048 kHz Inputs
Recovered clock from 54512-3 input cards, nominal 2.048 MHz; tracks
within ±10.2 x 10
-2
Hz.
d. Composite Clock Inputs
Recovered clock from 54513-3 input cards, nominal 2.048 MHz; tracks
within ±0.3 Hz.
e. 5 MHz Inputs
Recovered clock from 54513-4 input cards, nominal 5 MHz; tracks within
±23 Hz.
f. 10 MHz Inputs
Recovered clock from 54513-5 input cards, nominal 10 MHz; tracks within
±46 Hz.
g. 1.544 MHz RS-422 Inputs
Recovered clock from 54513-6 input cards, nominal 1.544 MHz; tracks
within ±7.7 x 10
-2
Hz.
h. 2.048 MHz RS-422 Inputs
Recovered clock from 54513-7 input cards, nominal 2.048 MHz; tracks
within ±10.2 x 10
-2
Hz.
i. Serial Data Input from transceiver on both input cards.
j. Transceiver Select lines from the other track and hold card.
k. Weak RF downlink signal from GPS satellites hitting the rooftop antenna.
This spread spectrum signal has a frequency of approximately 1.57 GHz at
an amplitude of approximately -135 dBm. The signal is delivered via
coaxial cable to the GPS receiver circuit on the 54593 card.