FCC G0A - 电气与射频安全

#G0A01🔗

What is one way that RF energy can affect human body tissue?

射频能量影响人体组织的一种方式是什么？

It heats body tissue

它加热身体组织

✓ 正确答案

It causes radiation poisoning

会引起辐射中毒

It causes the blood count to reach a dangerously low level

它导致血细胞计数达到危险的低水平

It cools body tissue

它冷却身体组织

#G0A02🔗

Which of the following is used to determine RF exposure from a transmitted signal?

以下哪项用于确定传输信号的射频暴露？

Its duty cycle

其占空比

Its frequency

其频率

Its power density

其功率密度

All these choices are correct

所有这些选项都是正确的

✓ 正确答案

#G0A03🔗

How can you determine that your station complies with FCC RF exposure regulations?

如何确定您的电台符合 FCC 射频暴露规定？

By calculation based on FCC OET Bulletin 65

根据 FCC OET Bulletin 65 计算

By calculation based on computer modeling

通过基于计算机建模的计算

By measurement of field strength using calibrated equipment

使用校准设备测量场强

All these choices are correct

所有这些选项都是正确的

✓ 正确答案

#G0A04🔗

What does “time averaging” mean when evaluating RF radiation exposure?

评估射频辐射暴露时“时间平均”是什么意思？

The average amount of power developed by the transmitter over a specific 24-hour period

发射器在特定 24 小时内产生的平均电量

The average time it takes RF radiation to have any long-term effect on the body

射频辐射对身体产生长期影响所需的平均时间

The total time of the exposure

总曝光时间

The total RF exposure averaged over a certain period

一定时期内平均的总射频暴露量

✓ 正确答案

#G0A05🔗

What must you do if an evaluation of your station shows that the RF energy radiated by your station exceeds permissible limits for possible human absorption?

如果对您的电台的评估显示您的电台辐射的射频能量超出了人体可能吸收的允许限值，您必须做什么？

Take action to prevent human exposure to the excessive RF fields

采取措施防止人体暴露于过度的射频场中

✓ 正确答案

File an Environmental Impact Statement (EIS-97) with the FCC

向 FCC 提交环境影响声明 (EIS-97)

Secure written permission from your neighbors to operate above the controlled MPE limits

获得邻居的书面许可，以便在受控 MPE 限制之上进行操作

All these choices are correct

所有这些选项都是正确的

#G0A06🔗

What must you do if your station fails to meet the FCC RF exposure exemption criteria?

如果您的电台不符合 FCC 射频暴露豁免标准，您必须做什么？

Perform an RF Exposure Evaluation in accordance with FCC OET Bulletin 65

根据 FCC OET 公告 65 执行射频暴露评估

✓ 正确答案

Contact the FCC for permission to transmit

联系 FCC 以获得传输许可

Perform an RF exposure evaluation in accordance with World Meteorological Organization guidelines

根据世界气象组织指南进行射频暴露评估

Use an FCC-approved band-pass filter

使用 FCC 批准的带通滤波器

#G0A07🔗

What is the effect of modulation duty cycle on RF exposure?

调制占空比对射频暴露有何影响？

A lower duty cycle permits greater power levels to be transmitted

较低的占空比允许传输更大的功率电平

✓ 正确答案

A higher duty cycle permits greater power levels to be transmitted

更高的占空比允许传输更大的功率电平

Low duty cycle transmitters are exempt from RF exposure evaluation requirements

低占空比发射器免于射频暴露评估要求

High duty cycle transmitters are exempt from RF exposure requirements

高占空比发射器不受射频暴露要求的影响

#G0A08🔗

Which of the following steps must an amateur operator take to ensure compliance with RF safety regulations?

业余操作员必须采取以下哪些步骤来确保遵守射频安全法规？

Post a copy of FCC Part 97.13 in the station

在车站张贴 FCC 第 97.13 部分的副本

Notify neighbors within a 100-foot radius of the antenna of the existence of the station and power levels

通知天线 100 英尺半径内的邻居电台的存在和功率级别

Perform a routine RF exposure evaluation and prevent access to any identified high exposure areas

执行例行射频暴露评估并防止进入任何已识别的高暴露区域

✓ 正确答案

All these choices are correct

所有这些选项都是正确的

#G0A09🔗

What type of instrument can be used to accurately measure an RF field strength?

什么类型的仪器可用于精确测量射频场强？

A receiver with digital signal processing (DSP) noise reduction

具有数字信号处理 (DSP) 降噪功能的接收器

A calibrated field strength meter with a calibrated antenna

带有校准天线的校准场强计

✓ 正确答案

An SWR meter with a peak-reading function

具有峰值读数功能的驻波比表

An oscilloscope with a high-stability crystal marker generator

带有高稳定性晶体标记发生器的示波器

#G0A10🔗

What should be done if evaluation shows that a neighbor might experience more than the allowable limit of RF exposure from the main lobe of a directional antenna?

如果评估表明邻居可能会遭受超过定向天线主瓣射频暴露的允许限制，该怎么办？

Change to a non-polarized antenna with higher gain

更换增益更高的非极化天线

Use an antenna with a higher front-to-back ratio

使用前后比较高的天线

Take precautions to ensure that the antenna cannot be pointed in their direction when they are present

采取预防措施，确保天线在存在时不会指向其方向

✓ 正确答案

All these choices are correct

所有这些选项都是正确的

#G0A11🔗

What precaution should be taken if you install an indoor transmitting antenna?

安装室内发射天线应注意哪些事项？

Locate the antenna close to your operating position to minimize feed-line radiation

将天线放置在靠近您的操作位置的位置，以最大限度地减少馈线辐射

Position the antenna along the edge of a wall to reduce parasitic radiation

将天线放置在墙壁边缘以减少寄生辐射

Make sure that MPE limits are not exceeded in occupied areas

确保占用区域不超过 MPE 限制

✓ 正确答案

Make sure the antenna is properly shielded

确保天线已正确屏蔽

#G0A12🔗

What stations are subject to the FCC rules on RF exposure?

哪些电台需要遵守 FCC 关于射频暴露的规则？

All commercial stations; amateur radio stations are exempt

所有商业车站；业余无线电台除外

Only stations with antennas lower than one wavelength above the ground

仅天线距离地面低于一波长的电台

Only stations transmitting more than 500 watts PEP

仅发射超过 500 瓦 PEP 的电台

All stations with a time - averaged transmission of more than one milliwatt

所有时间平均传输超过一毫瓦的电台

✓ 正确答案

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FCC G0A - 电气与射频安全

小节 G0A：电气与射频安全