大家可能已经知道在射频传输中,TOA(Time on Air)是指本包传输所需时间。本章主要来讨论如何理解这段时间,并从发送端和接收端一起来理解。本章是基于LoRa所做的测试,但我认为所有射频都是一样的。 2 解释说明 TOA,正常来讲是指radio从本包编码到发出的时间加上空中传输时间。但射频在空中传输是光速,对LoRa小无...
Packet Configuration:数据包配置 Payload length:有效载荷长度 Programmed Preamble:程序前导码 Total Preamble Length:前导码总长度 RF Settings:射频设置 Centre Frequency:中心频率 Transmit Power:发送功率 Timing Performance:时廷特性 Equivalent Bitrate:等效比特率 Prreamble Duration:前导码持续时间 Time on Air:空...
Programmed Preamble:程序前导码 Total Preamble Length:前导码总长度 RF Settings:射频设置 Centre Frequency:中心频率 Transmit Power:发送功率 Timing Performance:时廷特性 Equivalent Bitrate:等效比特率 Prreamble Duration:前导码持续时间 Time on Air:空中时间 Symbol Time:符号时间 RF Performance:射频特性 Link ...
The image below shows the main display of the LoRa calculator. Here we see that all of the design variables of this guide can be modified and the resultant RF and time on air performances are calculated without the need to manually calculate the qu ties of the design equations of both ...
Interval: ~<sleep_interval> / <sleep_interval_long> (depending on battery voltage); see Default Parameter Values LoRaWAN Node Status Message Payload: SignaldescriptionUnitTypeBytes ubatt_mv Battery Voltage mv uint16 2 long_sleep Flag: Long sleep time (energy saving) — uint8 1 PowerFeather sp...
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Arduino working voltage is 5v, so we need to add a voltage divider on RX pin M0 and M1 of LoRa module to prevent damage, you can get more information hereVoltage divider: calculator and application. You can use a 2Kohm resistor to GND and 1Kohm from signal than put together on RX. ...
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After one minute, they both go back to calling mode (which is not configured) and, this time, they correctly tune to 434.200, starting normal reception. Maybe the calling packet is also sent on the “standard” frequency? Tracker = ‘NASD086C1’ Channel 0 frequency set to 434.200MHz LoRa...
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