Which mode is normally used when sending RTTY signals via AFSK with an SSB transmitter?
使用 SSB 发射机通过 AFSK 发送 RTTY 信号时通常使用哪种模式？
What is VARA?
什么是VARA？
AA low signal-to-noise digital mode used for EME (moonbounce)
用于 EME (moonbounce) 的低信噪比数字模式
BA digital protocol used with Winlink
与 Winlink 一起使用的数字协议
CA radio direction finding system used on VHF and UHF
用于 VHF 和 UHF 的无线电测向系统
DDX spotting system using a network of software defined radios
使用软件定义无线电网络的 DX 定位系统
What symptoms may result from other signals interfering with a PACTOR or VARA transmission?
干扰 PACTOR 或 VARA 传输的其他信号可能会导致什么症状？
AFrequent retries or timeouts
频繁重试或超时
BLong pauses in message transmission
消息传输长时间停顿
CFailure to establish a connection between stations
站间建立连接失败
DAll these choices are correct
所有这些选项都是正确的
Which of the following is good practice when choosing a transmitting frequency to answer a station calling CQ using FT8?
在选择发射频率来应答使用 FT8 呼叫 CQ 的电台时，以下哪一项是好的做法？
AAlways call on the station’s frequency
始终拨打电台的频率
BCall on any frequency in the waterfall except the station’s frequency
呼叫瀑布内除电台频率外的任何频率
CFind a clear frequency during the same time slot as the calling station
在与主叫站相同的时隙内找到一个清晰的频率
DFind a clear frequency during the alternate time slot to the calling station
在备用时隙内找到主叫站的清晰频率
What is the standard sideband for JT65, JT9, FT4, or FT8 digital signal when using AFSK?
使用 AFSK 时，JT65、JT9、FT4 或 FT8 数字信号的标准边带是多少？
What is the most common frequency shift for RTTY emissions in the amateur HF bands?
业余 HF 频段 RTTY 发射最常见的频移是多少？
Which of the following is required when using FT8?
使用 FT8 时需要满足以下哪项要求？
AA special hardware modem
特殊的硬件调制解调器
BComputer time accurate to within approximately 1 second
计算机时间精确到约 1 秒以内
CReceiver attenuator set to -12 dB
接收器衰减器设置为 -12 dB
DA vertically polarized antenna
垂直极化天线
In what segment of the 20-meter band are most digital mode operations commonly found?
大多数数字模式操作最常见于 20 米频段的哪个部分？
AAt the bottom of the slow-scan TV segment, near 14.230 MHz
位于慢扫描电视部分的底部，接近 14.230 MHz
BAt the top of the SSB phone segment, near 14.325 MHz
位于 SSB 手机领域的顶部，接近 14.325 MHz
CIn the middle of the CW segment, near 14.100 MHz
位于 CW 段的中间，靠近 14.100 MHz
DBetween 14. 070 MHz and 14.100 MHz
14. 070 MHz 和 14.100 MHz 之间
How do you join a contact between two stations using the PACTOR protocol?
如何使用 PACTOR 协议加入两个站之间的联系？
ASend broadcast packets containing your call sign while in MONITOR mode
在 MONITOR 模式下发送包含您的呼号的广播数据包
BTransmit a steady carrier until the PACTOR protocol times out and disconnects
传输稳定的载波，直到 PACTOR 协议超时并断开连接
CJoining an existing contact is not possible, PACTOR connections are limited to two stations
无法加入现有联系人，PACTOR 连接仅限于两个站
Which of the following is a way to establish contact with a digital messaging system gateway station?
以下哪项是与数字消息系统网关站建立联系的方法？
ASend an email to the system control operator
发送电子邮件给系统主控操作员
BSend QRL in Morse code
以摩尔斯电码发送 QRL
CRespond when the station broadcasts its SSID
当电台广播其 SSID 时做出响应
DTransmit a connect message on the station’s published frequency
在电台发布的频率上发送连接消息
What is the primary purpose of an Amateur Radio Emergency Data Network (AREDN) mesh network?
业余无线电应急数据网络 (AREDN) 网状网络的主要用途是什么？
ATo provide FM repeater coverage in remote areas
为偏远地区提供调频中继覆盖
BTo provide real time propagation data by monitoring amateur radio transmissions worldwide
通过监测全球业余无线电传输来提供实时传播数据
CTo provide high - speed data services during an emergency or community event
在紧急情况或社区活动期间提供高速数据服务
DTo provide DX spotting reports to aid contesters and DXers
提供 DX 发现报告以帮助参赛者和 DXers
Which of the following describes Winlink?
以下哪项描述了 Winlink？
AAn amateur radio wireless network to send and receive email on the internet
用于在互联网上发送和接收电子邮件的业余无线电无线网络
BA form of Packet Radio
分组无线电的一种形式
CA wireless network capable of both VHF and HF band operation
能够进行 VHF 和 HF 频段操作的无线网络
DAll these choices are correct
所有这些选项都是正确的
What is another name for a Winlink Remote Message Server?
Winlink 远程消息服务器的另一个名称是什么？
ATerminal Node Controller
终端节点控制器
What could be wrong if you cannot decode an RTTY or other FSK signal even though it is apparently tuned in properly?
如果您无法解码 RTTY 或其他 FSK 信号，即使它显然已正确调谐，可能会出现什么问题？
AThe mark and space frequencies may be reversed
标记和空间频率可以颠倒
BYou may have selected the wrong baud rate
您可能选择了错误的波特率
CYou may be listening on the wrong sideband
您可能在错误的边带上收听
DAll these choices are correct
所有这些选项都是正确的
Which of the following is a common location for FT8?
以下哪一个是 FT8 的常见位置？
AAnywhere in the voice portion of the band
乐队声部的任何地方
BAnywhere in the CW portion of the band
频段 CW 部分的任何位置
CApproximately 14. 074 MHz to 14. 077 MHz
大约 14. 074 MHz 至 14. 077 MHz
DApproximately 14.110 MHz to 14.113 MHz
大约 14.110 MHz 至 14.113 MHz
