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1. 发明公开

EP1746685A3 Apparatus and method for local broadcasting in the twenty-six megahertz short wave band 审中-公开
标题翻译：设备和方法在26 MHz频段短波发送本地广播
公开(公告)号：EP1746685A3
公开(公告)日：2007-05-16
申请号：EP06015374.9
申请日：2006-07-24
申请人： TCI International, Inc.
发明人： Cheng, Po-Shin , Sinclair, Gordon G.
IPC分类号： H01Q19/12 , H01Q19/13 , H01Q19/28 , H01Q21/20 , H01Q21/10
CPC分类号： H01Q19/28 , H01Q1/246 , H01Q1/526 , H01Q3/2611 , H01Q15/168 , H01Q19/12 , H01Q19/13 , H01Q21/10 , H01Q21/205 , H01Q21/29
摘要： A short wave omnidirectional antenna for the 26 Megahertz band provides line-of-sight broadcasting at comparatively low power to serve local communities while suppressing sky wave propagation. Sky wave suppression is achieved by a critically configured reflector above the radiator or by a co-located second active or parasitic radiator spaced to achieve sufficient beam tilt to create a null at critical angles, generally from the horizon to thirty degrees above. This arrangement allows local broadcasts to be originated at numerous sites despite the narrow extent of the band (330 kHz) and the narrow (10 kHz) channel width. Among other possible applications, the antenna supports transmission using the Digital Radio Mondiale® (DRM®) system for COFDM. COFDM technology can suppress ghosting and most noise, while low emission angle of the antenna and low intended transmitter power largely prevent interference between broadcasts at moderate distances.

2. 发明公开

EP1746685A2 Apparatus and method for local broadcasting in the twenty-six megahertz short wave band 审中-公开
标题翻译： Gerätund Verfahren zum Senden von lokalem Rundfunk im 26 MHz Kurzwellenband
公开(公告)号：EP1746685A2
公开(公告)日：2007-01-24
申请号：EP06015374.9
申请日：2006-07-24
申请人： TCI International, Inc.
发明人： Cheng, Po-Shin , Sinclair, Gordon G.
IPC分类号： H01Q19/12 , H01Q19/13 , H01Q19/28 , H01Q21/20
CPC分类号： H01Q19/28 , H01Q1/246 , H01Q1/526 , H01Q3/2611 , H01Q15/168 , H01Q19/12 , H01Q19/13 , H01Q21/10 , H01Q21/205 , H01Q21/29
摘要： A short wave omnidirectional antenna for the 26 Megahertz band provides line-of-sight broadcasting at comparatively low power to serve local communities while suppressing sky wave propagation. Sky wave suppression is achieved by a critically configured reflector above the radiator or by a co-located second active or parasitic radiator spaced to achieve sufficient beam tilt to create a null at critical angles, generally from the horizon to thirty degrees above. This arrangement allows local broadcasts to be originated at numerous sites despite the narrow extent of the band (330 kHz) and the narrow (10 kHz) channel width. Among other possible applications, the antenna supports transmission using the Digital Radio Mondiale® (DRM®) system for COFDM. COFDM technology can suppress ghosting and most noise, while low emission angle of the antenna and low intended transmitter power largely prevent interference between broadcasts at moderate distances.
摘要翻译：用于26兆赫兹波段的短波全向天线以较低功率提供视距广播，以服务于当地社区，同时抑制天波传播。天体波抑制通过散热器上方的重要配置的反射器或通过共同定位的第二有源或寄生辐射器间隔开来实现，以实现足够的光束倾斜，从而在临界角度（通常从地平线到三十度）之间产生无效。这种布置允许本地广播来自许多站点，尽管频带（330kHz）和窄（10kHz）信道宽度的范围较窄。在其他可能的应用中，天线支持使用用于COFDM的Digital Radio Mondiale（DRM））系统的传输。 COFDM技术可以抑制重影和大多数噪声，而天线的低发射角和低预期的发射机功率可以大大地防止中距离的广播之间的干扰。

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