FCC E2D - 电台操作实践

#E2D01🔗

Which of the following digital modes is designed for meteor scatter communications?

以下哪种数字模式是为流星散射通信而设计的？

WSPR

MSK144

✓ 正确答案

Hellschreiber

赫尔施赖伯

APRS

#E2D02🔗

What information replaces signal-to-noise ratio when using the FT8 or FT4 modes in a VHF contest?

在 VHF 比赛中使用 FT8 或 FT4 模式时，哪些信息可以替代信噪比？

RST report

快速检测报告

State abbreviation

国家缩写

Serial number

序列号

Grid square

方格

✓ 正确答案

#E2D03🔗

Which of the following digital modes is designed for EME communications?

以下哪种数字模式是专为 EME 通信而设计的？

MSK144

PACTOR III

WSPR

Q65

✓ 正确答案

#E2D04🔗

What technology is used for real-time tracking of balloons carrying amateur radio transmitters?

使用什么技术来实时跟踪携带业余无线电发射机的气球？

FT8

Bandwidth compressed LORAN

带宽压缩 LORAN

APRS

✓ 正确答案

PACTOR III

#E2D05🔗

What is the characteristic of the JT65 mode?

JT65模式有何特点？

Uses only a 65 Hz bandwidth

仅使用 65 Hz 带宽

Decodes signals with a very low signal -to- noise ratio

以非常低的信噪比解码信号

✓ 正确答案

Symbol rate is 65 baud

符号率为 65 波特

Permits fast-scan TV transmissions over narrow bandwidth

允许在窄带宽上快速扫描电视传输

#E2D06🔗

Which of the following is a method for establishing EME contacts?

以下哪项是建立 EME 联系的方法？

Time- synchronous transmissions alternating between stations

站之间交替进行时间同步传输

✓ 正确答案

Storing and forwarding digital messages

存储和转发数字消息

Judging optimum transmission times by monitoring beacons reflected from the moon

通过监测从月球反射的信标来判断最佳传输时间

High-speed CW identification to avoid fading

高速CW识别，避免衰落

#E2D07🔗

What digital protocol is used by APRS?

APRS 使用什么数字协议？

PACTOR

QAM

AX. 25

斧。 25

✓ 正确答案

AMTOR

#E2D08🔗

What type of packet frame is used to transmit APRS beacon data?

使用什么类型的数据包帧来传输 APRS 信标数据？

Acknowledgement

致谢

Burst

爆发

Unnumbered Information

未编号的信息

✓ 正确答案

Connect

连接

#E2D09🔗

What type of modulation is used by JT65?

JT65使用什么类型的调制？

Multitone AFSK

多音AFSK

✓ 正确答案

PSK

相移键控

RTTY

QAM

#E2D10🔗

What does the packet path WIDE3-1 designate?

数据包路径 WIDE3-1 指定什么？

Three stations are allowed on frequency, one transmitting at a time

频率上允许三个电台，一次发射一个电台

Three subcarriers are permitted, subcarrier one is being used

允许使用三个子载波，正在使用子载波 1

Three digipeater hops are requested with one remaining

请求 3 个数字转发器跳数，剩余 1 个

✓ 正确答案

Three internet gateway stations may receive one transmission

三个互联网网关站可以接收一次传输

#E2D11🔗

How do APRS stations relay data?

APRS站如何中继数据？

By packet ACK/NAK relay

通过数据包 ACK/NAK 中继

By C4FM repeaters

通过 C4FM 中继器

By DMR repeaters

通过 DMR 中继器

By packet digipeaters

通过分组数字中继器

✓ 正确答案

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FCC E2D - 电台操作实践

小节 E2D：电台操作实践