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HP8657D Pi/4 DQPSK信号发生器可产生模拟及数字调制信号,可满足北美和日本数字蜂窝网无线设备的测试需要。这一新仪表在HP 8657 A/B信号发生器的基础上增加了测试北美双模式蜂窝网(NADC)及日本数字蜂窝网(JDC)系统时所需的各种调制。众所周知,用于NADC系统的无线设备应能在以下几种模式下工作,即:模拟先进的移动电话系统(AMPS)蜂窝网模式及数字模式。由于HP8657D可满足上述几种模式的测试需要,因而,只此一台信号发生器即可满足对移动无线电话的测试要求。在模拟模式下,HP8657D可提供高性能的AM、FM和脉冲调制信号。频率范围为0.1—1040 MHz在1GHz处剩余调频为4Hz,输出电平范围为+13
The HP8657D Pi / 4 DQPSK signal generator generates both analog and digitally modulated signals to meet the testing needs of wireless devices in digital cellular networks in North America and Japan. Based on the HP 8657 A / B signal generator, this new meter adds the various modulations required to test North American Dual Mode Cellular Network (NADC) and Japanese Digital Cellular Network (JDC) systems. It is well known that wireless devices used in NADC systems should be able to operate in the following modes: Simulated Advanced Mobile Phone System (AMPS) cellular network mode and digital mode. Because HP8657D can meet the above several kinds of mode test need, therefore, only this one signal generator can meet and test the requirement for the mobile wireless telephone. In analog mode, the HP8657D provides high-performance AM, FM, and pulse modulation signals. The frequency range is 0.1-1040 MHz The remaining FM at 1GHz is 4Hz and the output level is +13