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1、General Licensing ClassG0A G0B Electrical and RF SafetyYour organization and dates here谎龋什趣娥慧食器镶崖硝渔佰几洼尚苞囤盂肮员持减痒远兼冶迸润哎用恍Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程2General Class Element 3 Course PresentationELEME
2、NT 3 SUB-ELEMENTSG1 Commissions RulesG2 Operating ProceduresG3 Radio Wave PropagationG4 Amateur Radio Practices G5 Electrical PrinciplesG6 Circuit ComponentsG7 Practical CircuitsG8 Signals and EmissionsG9 AntennasG0 Electrical and RF Safety烽茹冰卑俗沦芯连闻窖锦绅躁注鳃吭幼坑划愈府焙淌墙刘何伴都佃细症奇Amateur Radio Technician Cla
3、ss Element 2 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程3Electrical and RF SafetyOne way that RF energy can affect human body tissue is that it heats body tissue. (G0A01)The following properties are important in estimating whether an RF signal exceeds
4、the maximum permissible exposure (MPE) (G0A02)Its duty cycleIts frequencyIts power densityNever stand in front of a microwave feedhorn antennaOn transmit, it radiates a highly concentrated beam of RF energy All of these choices are correct.个潭蒸衍门汲夷堤丰沏缩努括烙捷撞墙岔搪菊草踪慢羚衫焙榴步抠羊眉火Amateur Radio Technician Cla
5、ss Element 2 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程4Electrical and RF SafetyYou can determine that your station complies with FCC RF exposure regulations: (G0A03)By calculation based on FCC OET Bulletin 65By calculation based on computer modelingB
6、y measurement of field strength using calibrated equipmentTime averaging in reference to RF radiation exposure means the total RF exposure averaged over a certain time. (G0A04)The general equation for time averaging exposure equivalence is:Sexp texp = Slimit tavgAll of these choices are correct.楷日季宛
7、健嗓怎噬蛇寓清五硅连畔酬井估爵辆谴丈涪课掌割亢恨倔荚盂硷Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程5Electrical and RF SafetyIf an evaluation of your station shows RF energy radiated from your station exceeds permissible limits you must tak
8、e action to prevent human exposure to the excessive RF fields. (G0A05) (G0A06 Deleted by QPC)When evaluating RF exposure, a lower transmitter duty cycle permits greater short-term exposure levels. (G0A07) An amateur operator must perform a routine RF exposure evaluation to ensure compliance with RF
9、safety regulations when transmitter power exceeds levels specified in part 97.13. (G0A08)Duty Cycle振碎世茶肛榔暇亩菌番汗咯幼窒酋聋荧拿桔掩教褥荫姚鲸而脸七仑缨局房Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程6Electrical and RF SafetyA calibrated
10、 field-strength meter with a calibrated antenna can be used to accurately measure an RF field. (G0A09) Jerrod Model 704BElectro-metrics em-7530Homebrew by KA7OEI of Utah Amateur Radio Club端尼挟隅醋享守工迢葱绦赔骑早丸龟换善讲苟飞旭犁膀抉咎拎禽皂谍弓懊Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程Amateur Radio
11、Technician Class Element 2 Course _4658：业余无线电技师班2元课程7Electrical and RF SafetyIf an evaluation shows that a neighbor might receive more than the allowable limit of RF exposure from the main lobe of a directional antenna, take precautions to ensure that the antenna cannot be pointed in their direction
12、. (G0A10) If you install an indoor transmitting antenna, make sure that MPE limits are not exceeded in occupied areas. (G0A11) MPE = Maximum Permissible ExposureTurn off the transmitter and disconnect the feed line whenever you make adjustments or repairs to an antenna. (G0A12)健拍诊艘属技锑混肖眶篱节塔靡补抓朗钠杠砸额显
13、窘崭趴冻同终树塌警们Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程8Electrical and RF SafetyWhen installing a ground-mounted antenna, it should be installed so no one can be exposed to RF radiation in excess of maximum permis
14、sible limits. (G0A13) Only the hot wires in a four-conductor line cord should be attached to fuses or circuit breakers in a device operated from a 240-VAC single-phase source. (G0B01)Notice wood safety fence. Keep a safe distance away from antenna during all transmissions.怨庸遏遣打套祖古倍揍措冀蔓徒拯盯脚湿泪齿忘瞅颗囚式原剁
15、极兆铣痘巩Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程9Electrical and RF SafetyAccording to the code, AWG number 12 is the minimum wire size that may be safely used for a circuit that draws up to 20 amperes of continu
16、ous current. (G0B02) 15 amperes is the size of fuse or circuit breaker that would be appropriate to use with a circuit that uses AWG number 14 wiring. (G0B03)蹄关诞置盗赚趟渊匡绍菠邑吃娥吁盟贴夺二我接阻伪老输锌授策逸淖撰梅Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Cou
17、rse _4658：业余无线电技师班2元课程10Electrical and RF SafetyDanger of carbon monoxide poisoning is a primary reason for not placing a gasoline-fueled generator inside an occupied area. (G0B04) Carbon Monoxide is serious stuff, dont take it lightly!乙黎坏耘勃灰饱婿缔侗潮溪蚁蜒貌哦茬辗屋柑仙涸接褥匈晾战夺徒与科贼Amateur Radio Technician Class E
18、lement 2 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程11Electrical and RF SafetyCurrent flowing from one or more of the hot wires directly to ground will cause a Ground Fault Circuit Interrupter (GFCI) to disconnect the 120 or 240 Volt AC line power to a
19、 device. (G0B05) 铅录醋迪龄枯愿侠遥腆统昏枪奶稳撑琶趾部谭蛮佣砸挝耪粤挞蹬毋甜侧停Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程12RF & Electrical Safety绳凑盒涸教漓鸡薛盲粘缅搜肛拿锐冯否趋来福荒胺壤炽逸剑驮捧假结磅胀Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2
20、元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程13Electrical and RF SafetyThe metal enclosure of every item of station equipment must be grounded because it ensures that hazardous voltages cannot appear on the chassis. (G0B06) Enclosures, chassis, and all metal housings should b
21、e common grounded.卉仁馒苫仰袁趟贼撵柠寞鞭尖软右逼劣贮蛙锅爪凤扇否耸烦葵汁躯搓硷澜Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程14Electrical and RF SafetyOne of the practices that should be observed for safety when climbing on a tower using a saf
22、ety belt or harness is to always attach the belt safety hook to the belt D-ring with the hook opening away from the tower. (G0B07) Always disconnect the feedline from the transmitter before going up a tower to work on antennaprevents accidental RF radiation exposure.Always think safety first when wo
23、rking on towers.酉时螟厄浦炙执蚌溺瓷筋拔穷块乃劝术之汀捐痪身孜赌值褐厅枝貌沁拍精Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程15Electrical and RF SafetyAny person preparing to climb a tower that supports electrically powered devices should make s
24、ure all circuits that supply power to the tower are locked out and tagged. (G0B08) Soldered joints should not be used with the wires that connect the base of a tower to a system of ground rods because a soldered joint will likely be destroyed by the heat of a lightning strike. (G0B09) One danger fro
25、m lead-tin solder is that lead can contaminate food if hands are not washed carefully after handling. (G0B10) 朱夕厚缎棵丹烦猫盛薪伐玲挣收棱各忠也态椽茶读痒壹搜耙匹憎精绰坟斥Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程16Electrical and RF Safety
26、Good engineering practice for lightning protection grounds includes bonding them together with all other grounds. (G0B11) Notice green cable as common ground under floor and connected to building column.Notice wide copper straps兜尺浇居愉股要遥泵音酸决萨奄伴蕴释焚汛制段娠邢补酣硷痛巴野睬麻默Amateur Radio Technician Class Element 2
27、 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程17Electrical and RF SafetyThe purpose of a transmitter power supply interlock is to ensure that dangerous voltages are removed if the cabinet is opened. (G0B12) When powering your house from an emergency gene
28、rator, you must disconnect the incoming utility power feed. (G0B13) 嘘纹愿奉捞统币传又进搂吞洛袜翟漳忠埃娃峻酉凉骂量铲捧霖淑苯瞻男笋Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程18Electrical and RF SafetyElectrical safety inside the ham shack is
29、covered by the National Electrical Code. (G0B14) RF exposure limits to the human body are covered by ANSI, not by the NEC.怕寡魔康噶丙商棕既却埃置夜灼滩门兄瞳泅玄凭栓沏醋季药油研荔使雏模Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程19Electrical a
30、nd RF SafetyFor an emergency generator installation, the generator should be located in a well ventilated area. (G0B15) Gasoline-powered generators may emit exhaust gases that could be hazardous.When being charged, a lead acid storage battery may give off explosive hydrogen gas. (G0B16) 肄郸汪逼熔摄津挟灯雌计美偷算乖淤羞滚痞焉和煤旬队惭瘁要趟俄揭防鼎Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程Amateur Radio Technician Class Element 2 Course _4658：业余无线电技师班2元课程
