Last week，we finish 20 pcs EP2 sample for RF module,
Fistly，we need to test PCBA performance test .include tranamitted power, frequency deviation，and harmonic wave，that took a long time，but not to worry，we can finish it。
Secondly ，we must complete three product test in this week，because customer need to check it and prepare the next mass production，Based oncustomerneeds,inmeeting theperformanceandreliability underthepremise ofcustomerstoselectthe mostpricecompetitiveproductsisourdefinitionofquality.
Lastly，the distance test must be completed today，and analysis the data，come up with a credible solution to slove the problem about signal attenuation。（Um，that‘s a bit difficult ）
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The record of distance test today as follow。
1 The principle of RF
Firstly, basedona lot of literature anoverview ofRFtechnology is presentedincluding fundamental wave signal，carrier signal，modulation and demodulation signals.
Theprocess ofretrievingintelligence(data)from amodulatedcarrierwave;thereverse ofmodulation.
Whenreceiving,the modemperformsthe reverseprocess, anddemodulatesthedatafrom thecarriersignal.
2 Environment disturbance
Thecommunicationsprotocolsusedbymobilephonesoftenresult inlow-frequencypulsingof thecarriersignal.
3 Characteristic
Theratioofpeak andaveragepower inmulticarriersystemis muchlarger than thatin single carrier system,and may grow unboundedlyas thenumberof subcarriersgrows toinfinity.
