手机信号放大器简介

手机信号放大器简介 蓝光科技通信 一:手机信号放大器简介 信号放大器从其名称我们就知道其功能是放大信号。信号放大器的种类很多，比如电视信号放大器，收音机放大器等，所有的接收机里面都有信号放大器。专门放大手机信号的放大器叫手机信号放大器。 为什么需要手机信号放大器呢,原因主要有以下四点: 第一，我国移动通信事业的飞速发展，移动通信用户也随之不断增加，以至蜂窝越来越小，基站位置越来越低，信号覆盖范围越来越小; 第二，随着城市建设的发展，高层建筑不断涌现，基于无线传播的阴影效应，在这些高层建筑的背后或中间层会形成移动通信的信号盲区; 第三，蜂窝移动通信基站在建造过程中，因为要避免邻近小区的干扰，其天线辐射场方向图主瓣有较大下倾角，以至高层建筑中上部一般不能有效接收信号; 第四:由于建筑物等对电磁波的屏蔽效应，使得隧道、地铁、地下商城、娱乐城、停车场以及酒店、写字楼等一些封闭的大型建筑物内也无法正常接收移动通信信号。 手机信号放大器就是为了解决上述四点问而产生的。只要在特定的地方安装一套手机信号放大器系统，整个范围内的手机信号都可以很好地使用，给里面的工作人员或客人带来很大的方便。手机信号放大器可以有效解决高大建筑物里边、地下室等地方一些商场、餐厅、卡拉OK桑拿按摩等娱乐场所、地下人防工程、地铁站等许多场所信号差的问题。 二:手机信号放大器的基本常识 说到手机信号放大器，大家都知道它的作用是放大手机信号，但是对于其它的就不了解了。比如我们手机信号不好，是不是我们都可以安装手机信号放大器,答案显然是否定的。下面我们就介绍手机信号放大器的基本常识。 第一 干扰性 Therefore, physicians were practising this profession requires not only medical expertise as a basis, but also to learn to apply for emergency medical techniques and methods to save a patient's life. These rules apply to the emergency department medical specialist the first 3 years of training. (For example, master, doctoral graduates, and residency can be reduced to 2 years), training goals through 3 years of basic training, the trainees master the basic theory, basic knowledge and basic skills, ability to achieve independent diagnosis and treatment of common acute and severe. To master common symptoms differential diagnosis of acute; master classification of emergency patient's condition; be familiar with first aid techniques and methods commonly used; the basic right and an independent common emergency first-aid treatment. Read books about emergency medicine; knowledge of clinical research methods, seamless integration of clinical practice, writes with a certain level of reports and reviews of medical records. Second, standardized training methods trainees to take part in specialist training standard set theory course, Rotary range should focus on emergency medicine, high risk should appear in the acute and severe Department Web-oriented, taking into account their relevant specialties. Wheel arrangement in clinical departments: emergency medicine (including emergency ICU) 15 months, related disciplines of emergency medicine rotation for 21 months. Detailed 手机信号放大器要发射无线电波，对基站产生干扰。一般100mW内质量好的主机干扰几乎可以忽略。功率较大且距离较近干扰也就越大。 第二 辐射性 任何通信设备都有一定辐射。如果大功率的设备，如5W(37dBm)以上的主机也可能有较大的辐射。 一般手机信号增强器输出功率都在200mW(23dBm)以内。到达天线后的一般为5mW(7dBm)以内。经过其它损耗安装手机信号增强器后室内的信号一般在-50dBm到-75dBm左右。室外好的信号一般在-40dBm到-75dBm左右。 手机通话的时候，GSM手机在信号弱的环境中通话，辐射功率最坏可以达到1W(30dBm)。安装放大器信号变好后手机通话的辐射功率大约为10mW(10dBm)左右。也可以说在差信号环境中安装放大器后，手机在通话的时候是减少了辐射。 三:手机信号放大器工作原理: 下行:室外八木接收可通话的有用信号(一般手机显示4格作用)，输入到主机，主机通过放大后送往室内吸顶天线，然后再通过天线辐射，到用户的手机，此为下行。 上行:用户手机发射信号 ，被吸顶天线吸收输入到主机，然后通过主机放大，再送往室外八木或板状天线发射到基站，此为上行。 手机信号放大器安装注意事项: 1、室外天线的安装位置必须能清晰的打电话，八木的安装一般为水平安装。 2、八木和吸顶天线的距离要尽可能拉开，大于8米,不能在同一个视线范围内，以免引起自激，典型的一般利用墙壁做隔离，效果好。 3、50-5同轴线一般是F头转接到主机，应绝对保证F头紧固，并充分接地，这样效果会比较明显。 4、F头一定为50-5英制 线也应该配套50-5同轴线，否则会出现不能安装的问题。 四:手机信号放大器的主要性能指标 手机信号放大器用来放大手机信号，其性能的优良通过其技术指标来衡量。手机信号放大器的技术指标很多，主要的性能指标五个。 输出功率、增益、自动增益控制 Therefore, physicians were practising this profession requires not only medical expertise as a basis, but also to learn to apply for emergency medical techniques and methods to save a patient's life. These rules apply to the emergency department medical specialist the first 3 years of training. (For example, master, doctoral graduates, and residency can be reduced to 2 years), training goals through 3 years of basic training, the trainees master the basic theory, basic knowledge and basic skills, ability to achieve independent diagnosis and treatment of common acute and severe. To master common symptoms differential diagnosis of acute; master classification of emergency patient's condition; be familiar with first aid techniques and methods commonly used; the basic right and an independent common emergency first-aid treatment. Read books about emergency medicine; knowledge of clinical research methods, seamless integration of clinical practice, writes with a certain level of reports and reviews of medical records. Second, standardized training methods trainees to take part in specialist training standard set theory course, Rotary range should focus on emergency medicine, high risk should appear in the acute and severe Department Web-oriented, taking into account their relevant specialties. Wheel arrangement in clinical departments: emergency medicine (including emergency ICU) 15 months, related disciplines of emergency medicine rotation for 21 months. Detailed 额定(最大)输出功率、额定(最大)增益(及增益调节范围、自动增益控制范围)及输入电平。这是一组互相关联的指标，应综合考虑。通常最大输出功率在不超过信息产业部无线电管理局规定的最大限值的情况下，应分成若干等级供用户选用，下行主要考虑覆盖，上行保证基站满意接收。因此，下行一般大于上行。增益是将接收到的信号放大到额定输出功率。考虑到直放站安装地点信号强度的差异，增益应是可调的。最大增益可以考虑将直放站接收到的信号电平放大到最大输出功率来计算。为了保证输出功率稳定和避免输出非线性，带有?20dB的自动增益控制(AGC)看来是必要的。关于容差、额定输出功率和额定增益，只要规定一个就可以了。一般规定增益容差比较合适。因为测试时是将增益调到最大，改变输入电平使输出达到额定值。既然是这样，额定功率当然就不必规定容差了，而这时，输入电平也因增益不同而不同。 工作频带 不同的系统手机信号放大器的工作频段也不一样，比如联通、电信、移动的工作频段都是独立的。具体频段可以查阅相关资料。 带宽，带内波动 这是一组互相有关系的指标，尤其是带宽和带内波动。通常，带宽是指-3dB带宽，而带内波动是指带内的不平坦度。如果要求带内波动比3dB小，则-3dB带宽必然要比分配给它的带宽要宽，这样，势必侵占别的信道。因此，带内波动最大只能是3dBp-p。 带外抑制 带外抑制主要是对滤波器形状的要求。为了不对别人形成干扰，希望滤波器形状尽量接近矩形。通常以-60(或-40)dB带宽对-3dB带宽的比(有人称之为滤波器的形状系数)来衡量。 交调和杂散发射 谐波、交调和杂散都是不希望有的无用信号，可以提出一样的要求。 对GSM手机信号增强器，按YD/T 883-1999和ETS 300 609要求是合适的，对CDMA手机信号增强器，只有按YD/T 1047-2000来要求了。 五:手机信号放大器的安装使用 Therefore, physicians were practising this profession requires not only medical expertise as a basis, but also to learn to apply for emergency medical techniques and methods to save a patient's life. These rules apply to the emergency department medical specialist the first 3 years of training. (For example, master, doctoral graduates, and residency can be reduced to 2 years), training goals through 3 years of basic training, the trainees master the basic theory, basic knowledge and basic skills, ability to achieve independent diagnosis and treatment of common acute and severe. To master common symptoms differential diagnosis of acute; master classification of emergency patient's condition; be familiar with first aid techniques and methods commonly used; the basic right and an independent common emergency first-aid treatment. Read books about emergency medicine; knowledge of clinical research methods, seamless integration of clinical practice, writes with a certain level of reports and reviews of medical records. Second, standardized training methods trainees to take part in specialist training standard set theory course, Rotary range should focus on emergency medicine, high risk should appear in the acute and severe Department Web-oriented, taking into account their relevant specialties. Wheel arrangement in clinical departments: emergency medicine (including emergency ICU) 15 months, related disciplines of emergency medicine rotation for 21 months. Detailed 手机信号放大器用于放大手机信号，主要用于解决室内手机信号盲区问题。手机信号放大器的安装使用要注意以下几个问题: 第一，选择型号。手机信号放大器主要根据信号覆盖面积和建筑物的结构选择型号。信号太弱，覆盖不全，信号太强，对室外信号有干扰。 第二，布置天线。室外采用定向八木天线，天线的方向尽量可以指向移动公司的发射基站，以达到最佳的接收效果，室内可采用全向天线，安装高度为2-3米，天线的安装数量和位置与室内面积和室内的结构有关，一室内无阻挡范围300平米以下只需安装1个天线，范围300-500平米需装2个天线，范围500-800平米需装3个天线。此外，安装时室内天线发出的信号不能让室外天线接收到，不然会产生自激。 第三，手机信号放大器的安装。一般安装在离地2米以上，设备安装的位置和室内外天线的距离要采用最短距离的走线方式(线路越长信号衰减就越大)以达到最佳的效果。 第四，馈线的选择。信号增强器的馈线广电(即有线电视)的标准为75Ω，但手机信号放大器是通信行业，50Ω才是标准，且阻抗不对会让系统指标恶化。线材的粗细按现场实际情况来决定，线路越长线材就要采用越粗以减少信号的衰减。另外，如果采用75Ω的线材线让主机与线材不匹配会让驻波增加产生更多干扰问题，因此线材的选用要根据行业有所区分。 六:什么是辐射,通讯基站的辐射对人有影响吗, 辐射定义 自然界中的一切物体,只要温度在绝对温度零度以上,都以电磁波的形式时刻不停地向外传送热量,这种传送能量的方式称为辐射。物体通过辐射所放出的能量，称为辐射能，简称辐射。 辐射有一个重要的特点，就是它是“对等的”。不论物体(气体)温度高低都向外辐射，甲物体可以向乙物体辐射，同时乙也可向甲辐射。这一点不同于传导，传导是单向进行的。 辐射能被物体吸收时发生热的效应，物体吸收的辐射能不同，所产生的温度也不同。因此，辐射是能量转换为热量的重要方式。 辐射是以电磁波的形式向外放散的。是以波动的形式传播能量。无线电波和光波都是电磁波。它们的传播速度很快，在真空中的传播速度与光波(3×1010厘米/秒)相同，在空气中稍慢一些。 电磁波是由不同波长的波组成的合成波。它的波长范围从10E-10微米(1微米=10E-4厘米)的宇宙线到波长达几公里的无线电波。Υ射线、X 射线、紫外线、可见光、红外线，超短波和长波无线电波都属于电磁波的范围。肉眼看得见的是电磁波中很短的一段，从0.4-0.76微米这部分称为可见光。可见光经三棱镜分Therefore, physicians were practising this profession requires not only medical expertise as a basis, but also to learn to apply for emergency medical techniques and methods to save a patient's life. These rules apply to the emergency department medical specialist the first 3 years of training. (For example, master, doctoral graduates, and residency can be reduced to 2 years), training goals through 3 years of basic training, the trainees master the basic theory, basic knowledge and basic skills, ability to achieve independent diagnosis and treatment of common acute and severe. To master common symptoms differential diagnosis of acute; master classification of emergency patient's condition; be familiar with first aid techniques and methods commonly used; the basic right and an independent common emergency first-aid treatment. Read books about emergency medicine; knowledge of clinical research methods, seamless integration of clinical practice, writes with a certain level of reports and reviews of medical records. Second, standardized training methods trainees to take part in specialist training standard set theory course, Rotary range should focus on emergency medicine, high risk should appear in the acute and severe Department Web-oriented, taking into account their relevant specialties. Wheel arrangement in clinical departments: emergency medicine (including emergency ICU) 15 months, related disciplines of emergency medicine rotation for 21 months. Detailed 光后，成为一条由红、橙、黄、绿、青、蓝、紫七种颜色组成的光带，这光带称为光谱。其中红光波长最长，紫光波长最短，其它各色光的波长则依次介于其间。波长长于红光的(>0.76微米)有红外线有无线电波;波长短于紫色光的(<0.4微米)有紫外线，Υ射线、X射线等。这些辐射虽然肉眼看不见，但可用仪器测出。 太阳辐射波长主要为0.15-4微米，其中最大辐射波长平均为0.5微米;地面和大气辐射波长主要为3-120微米，其中最大辐射波长平均为10微米。习惯上称前者为短波辐射，后者为长波辐射。 在辐射源集中的环境中工作、学习、生活的人，容易失眠多梦、记忆力减退、体虚乏力、免疫力低下等，其癌细胞的生长速度比正常人快二十四倍。 辐射离我们有多远 在我们的生活环境中，辐射无处不在～ 家用电器:电视、电冰箱、空调、微波炉、吸尘器等 办公设备:手机、电脑、复印机、电子仪器、医疗设备等 家庭装饰:大理石、复合地板、墙壁纸、涂料等 周边环境:高压线、变电站、电视(广播)信号发射塔等 自然环境:太阳黑子等 如何避免受到电磁辐射污染的侵害 随着科技的高速发展，各种各样的科技产品、家用电器走入人们的生活，这一切都大大地提高了人们的工作效率、改善了人们的生活，不敢想象，如果没有了这些带电设备人们的生活将会怎样,可是随着城市周围的高压电、发射塔越来越高，家中的电器设备越来越多，人们感到便利的同时，也在受着伤害。目前电磁辐射污染已成为继水、空气、噪声之后的第四大环境污染。如果有一天，您所住的房屋突然被告知处在比较严重的电磁辐射当中，您会怎么样呢,这些众多的家用电器中您能找出辐射量比较高的电器都是哪些吗,什么是电磁辐射,专业的角度来讲，电磁辐射就是能量以电磁波的形式通过空间传播的现象。在我们家中几乎任何的电器都会产生电磁辐射。比如微波炉、电视机、电脑、手机等～ 电磁辐射和电磁辐射污染的区别, 其实电磁辐射和电磁辐射污染是两个概念，任何带电体都有电磁辐射，当电磁辐射强度超过国家标准，就会产生负面效应，引起人体的不同病变和危害，这部分超过标准的电磁场强度的辐射叫电磁辐射污染。 手机基站辐射对人的身体有什么影响, 这是一种比较普遍的现象，在市区内的许多居民楼上都安装有手机基站。部分市民担心这样的装置所产生的电磁辐射是否会对人体产生危害。其实，这个问题，大家没必要担心。手机辐射与手机基站辐射的不同。一般一部手机的电磁辐射值在0.03-0.7之间，而一个手机基站的辐射值在10微瓦。一个手机基站所产生的辐射值比一部手机的值高不出多少～说到这里，更值得一提的是，当手机信号教差时，手机会不断的搜索信号，这时产生的辐射将大大增加，长时间处于这样的环境，对人体是有危害的。 另外，电磁辐射是距离越近、受辐射时间越长，所受到的伤害越深～而我们一般的居民家楼屋顶上安装的手机基站离我们的距离为安全距离，所以大家完全可以放心～ 电磁辐射会对人体产生哪些危害, 因为每个人的身体抵抗能力不同，每个人会出现不同程度的症状。一般受到电磁辐射污染会引起头疼、失眠、心率不齐等中枢神经的问题。同时，对于有些人的Therefore, physicians were practising this profession requires not only medical expertise as a basis, but also to learn to apply for emergency medical techniques and methods to save a patient's life. These rules apply to the emergency department medical specialist the first 3 years of training. (For example, master, doctoral graduates, and residency can be reduced to 2 years), training goals through 3 years of basic training, the trainees master the basic theory, basic knowledge and basic skills, ability to achieve independent diagnosis and treatment of common acute and severe. To master common symptoms differential diagnosis of acute; master classification of emergency patient's condition; be familiar with first aid techniques and methods commonly used; the basic right and an independent common emergency first-aid treatment. Read books about emergency medicine; knowledge of clinical research methods, seamless integration of clinical practice, writes with a certain level of reports and reviews of medical records. Second, standardized training methods trainees to take part in specialist training standard set theory course, Rotary range should focus on emergency medicine, high risk should appear in the acute and severe Department Web-oriented, taking into account their relevant specialties. Wheel arrangement in clinical departments: emergency medicine (including emergency ICU) 15 months, related disciplines of emergency medicine rotation for 21 months. Detailed 眼睛可能产生影响，出现视力下降、皮肤病等现象，重的还有可能致癌。对于孕 妇可能导致流产，安装了心脏起博器的老人尤其要注意。同时，不同的人或同一 人在不同年龄段对电磁辐射的承受能力也是不一样的 Therefore, physicians were practising this profession requires not only medical expertise as a basis, but also to learn to apply for emergency medical techniques and methods to save a patient's life. These rules apply to the emergency department medical specialist the first 3 years of training. (For example, master, doctoral graduates, and residency can be reduced to 2 years), training goals through 3 years of basic training, the trainees master the basic theory, basic knowledge and basic skills, ability to achieve independent diagnosis and treatment of common acute and severe. To master common symptoms differential diagnosis of acute; master classification of emergency patient's condition; be familiar with first aid techniques and methods commonly used; the basic right and an independent common emergency first-aid treatment. Read books about emergency medicine; knowledge of clinical research methods, seamless integration of clinical practice, writes with a certain level of reports and reviews of medical records. Second, standardized training methods trainees to take part in specialist training standard set theory course, Rotary range should focus on emergency medicine, high risk should appear in the acute and severe Department Web-oriented, taking into account their relevant specialties. Wheel arrangement in clinical departments: emergency medicine (including emergency ICU) 15 months, related disciplines of emergency medicine rotation for 21 months. Detailed