PDA,藍牙GPS接收器專用天線,具有靈敏度高的特點,使用方便,直接放置于車頂或者室外,小型MCX或者MMCX接頭輕松方便和你的PDA,藍牙連接. 一、天線特性AntennaSpecificationGAS1575R(25×25×4)中心頻率CenterFrequency1575.42MHz±3MHz電壓駐波比V.S.W.R1.5:1帶寬BandWidth±5MHz帶外衰耗Attenuationfo±100MHz＞30dB阻抗Impendence50ohm最高增益PeakGain＞3dBicBasedon7×7cmgroundplane增益范圍GainCoverage＞-4dBicat–90°＜0＜+90°(over75%Volume)天線極化PolarizationRHCP二、放大器規格LNASpecificationGAA1575A4A2放大器增益LNAGain(Withoutcable)27dBTypical噪聲系數NoiseFigure1.5dB輸出電壓駐波比V.S.W.R＜2.0直流電壓DCVoltage5V±0.5V直流電流DCcurrent15mAMax三、結構特性MechanicalSpecificationGAA1575A4A2重量Weight＜100(克)gram外型尺寸Size49×36×14mm電纜CableRG1745meterlongorother連接器型號ConnectorSMBPLUG固定方式Mounting磁性Magneticbase外殼顏色Housing黑Black四、低噪聲放大器原理LNA 兩級放大五、環境特性EnvironmentalSpecification工作溫度WorkingTemp-40℃~+85℃極限溫度StorageTemp-40℃~+100℃振動VibrationSinesweep1g(0-p)10~50~10Hzeachaxis濕度Humidity95%~100%RH防水Weatherproof100%Waterproof可靠性MTBF=1×10-6/pc.hr40℃±5℃DC=5V±0.5V數量2000pcs持續時間為480h