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手机通常都能找到GPS北斗和俄国导航的卫星。GPS提供免费的单工 simplex 服务，但GPS一直提供付费的双工 duplex 服务，就是不仅自己得到自己的定位信息，别人/公司也可以通过GPS跟踪，这是一个卖这种收/发器的网站

w4b(w4b)

Full-duplex receiver enables simultaneous TX/RX within 144/440MHz bands as well as V/V and U/U receiver capability.

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Last Updated: 1-3
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