Sub-GHz Radio Goes the Distance
随着2.4 GHz ISM频段变得更加拥挤,亚兆赫868兆赫频段已经开始得到很多关注-提供更大的范围和更少的干扰。同样的论点,适用于868兆赫,甚至更引人注目,在一半的频率。Silicon Labs ezr-ledk2w双向链接的演示套件使得它在较低的频段范围的测试设计容易。
建立在Silicon Labs的ezradio®si4455收发器,该套件包含两个电池供电的射频收发器板(rfstick)和编程的toolstick底座适配器。该试剂盒有三个版本:434 MHz的运行ezr-ledk2w-434,868 MHz和915 MHz ezr-ledk2w-868,ezr-ledk2w-915。本文包括对434 MHz工具包的一次实际检查,并进行范围测试,以检查不同距离的分组错误率。
Silicon Labs si4455 ezradio双向链接的演示工具(参见图1)包含两个完整的收发器电路板印制的定向天线,编程板两toolstick底座适配器,两USB扩展器电缆,四节AAA电池。该板预编程的范围测试演示,让你很快看到多远,你可以传输数据在亚GHz频率相比,Wi - Fi的或蓝牙在2.4千兆赫的销售。使用该套件的434 GHz版本的差异-甚至允许内置的定向天线-是戏剧性的。
The transceiver boards are divided into two sections that can be easily split apart. Silicon Labs even encourages you to split them apart and use the transceiver module directly in your own designs. To do so, you need to remove a “zero-ohm resistor” that then bypasses the PCB antenna and routes the output of the PA to an F-connector for use with an external antenna.
The transceiver portion of the board is built around Silicon Labs’ “next-generation EZRadio” chip, the Si4455 (see Figure 2)。 The chip is a complete sub-GHz RF transceiver including a PA and SPI MCU interface. The Si4455 covers all the major sub-GHz bands from 283 to 960 MHz. In TX mode, the chip draws 18 mA from a 1.8 to 3.6 V supply at +10 dBm output (+13 dBm max)。 It can transmit using FSK, GFSK, and OOK modulation with a maximum data rate of 500 kbps.
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