CC1101 RSSI and LQI Test

This test is based on our basic CC1101 board, it is the basic version, not the highest signal strength, nor using the on-board MCU to simply the communication to serial port. So this board works at SPI originally. First what is LQI and RSSI, we copied an answer from this link to here briefly: LQI

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Cheap Dual-Band SIM900A GSM Module

As you may know, SIM900 is a quad band modem being able to operate in 850,900,1800,1900 MHz bands, while SIM900A is a dual band GSM modem being able to operate only in 900,1800 MHz bands. You can see the supported countries in the list below, however, the fastest way is to check the actual frequency

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Unfinished Quick PCB Service Intro

DIfferences with a normal finished PCB: This is a rough introduction about the “unfinished” quick PCB service (Let’s call it UQ-PCB in the following text), what it is? From the meaning of the name, it is not-yet finished, the board have these following differences with normal “finished” board: No solder mask and silk print on

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