Xi'an SYNC

First, Main performance indicators

The GPS/ Beidou satellite signal can be effectively received by the time server after the transmission of the 100 meter long cable.

Two. System block diagram

The scheme consists of a set of GPS/ Beidou antenna, two 7mm cable with diameter of 50 meters, and a low noise amplifier.

GPS/ The Beidou dual-mode antenna receives the GPS/ Beidou satellite's radio signal. The signal intensity of the antenna is 45dB. After 50 meters -7 transmission line, it probably attenuates 22dB. At present, the signal intensity of 23dB is left, and then the low-noise amplifier makes the signal further enhance 26dB, then it becomes 49db. After 50 meters of -7 cable transmission, the strength of 27db signal is left.The optimal receiving strength of the time server is about 27db. This intensity is no problem to the time server, which fully meets the requirements of the receiver for signal strength.

Three. The system uses different modules to illustrate:

GPS The antenna uses a mushroom head antenna with a gain of more than 40dB.

The cable selects the -7 low loss cable, the attenuation coefficient is 0.43dB/m, divides into two parts, the length 50 meters, fully conforms to the transmission request.

The passive amplifier uses an amplifier with a gain of less than 26dB, without additional power supply. It only needs the original GPS receiver to feed, so that the installation is convenient, that is, the transmission requirements can be achieved.

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