搜索优化
English
搜索
Copilot
图片
视频
地图
资讯
购物
更多
航班
旅游
酒店
房地产
笔记本
Top stories
Sports
U.S.
Local
World
Science
Technology
Entertainment
Business
More
Politics
时间不限
过去 1 小时
过去 24 小时
过去 7 天
过去 30 天
按相关度排序
按时间排序
电子工程专辑
2 年
VHF和UHF信号视距传播距离计算器
特高频(UHF,也称分米波)在我国的频率范围是470MHz~806MHz 30MHZ以下的短波段(HF段)无线电信号是依靠电离层的反射进行远距离的传播,传播的距离可以由数百公里至上万公里,由于电离层本身的特殊性,正常情况下电离层对高于40MHZ的无线电信号的反射是很 ...
腾讯网
10 天
自媒体必备!领夹麦克风到底怎么选?
UHF无线领夹麦克风 ...
来自MSN
4 个月
夜鹰号发射成功!镭洋与太空中心合作首颗3U通信立方卫星升空
并有海内外多位UHF无线电用户成功接收到夜鹰号卫星发出的beacon信号。 夜鹰号为镭洋科技参与国家太空中心创业公司追星计划任务,以创建台湾卫星 ...
当前正在显示可能无法访问的结果。
隐藏无法访问的结果
今日热点
LA wildfires death toll rises
California fires: How to help
Smith resigns from DOJ
'Struggling to make a living'
Tulsa race massacre report
Tops Box Office opening
6.2 quake strikes Mexico
USDA report on outbreak
Cases in China declining?
Chicken broth recalled
Biden honors Pope Francis
Pleads guilty in Adams’ case
1st World Cup skiing victory
‘The Waltons' director dies
Southern US winter storm
Wild-card playoff win
1962 Mets member dies
Set for Senate hearings
DC sues federal government
Held in contempt of court
Prosecutors seek 15 years
Sworn in for third term
Williams to join Paul Weiss
NYC to spend $650 million
Tax season begins Jan 27
End plans for Venu Sports
Meets with Trump envoy
To be released after 7 years
UKR captured NK soldiers?
Sentenced to time served
反馈