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1. 外观设计

USD530317S1 Radio modem having a chamfered sheet metal shield 有权
标题翻译：无线电调制解调器具有倒角金属屏蔽
公开(公告)号：USD530317S1
公开(公告)日：2006-10-17
申请号：US29214943
申请日：2004-10-12
申请人： Martin R. Johnson , Hugh C. Nielsen , David C. Steed
设计人： Martin R. Johnson , Hugh C. Nielsen , David C. Steed

2. 发明申请

US20070037546A1 Superheterodyne receiver having at least one downconversion stage empolying a single image reject filter stage and both low-side injection and high-side injection of a local oscillator signal 有权
标题翻译：具有至少一个下变频级的超外差接收器，其具有单个图像抑制滤波器级以及本地振荡器信号的低侧注入和高侧注入
公开(公告)号：US20070037546A1
公开(公告)日：2007-02-15
申请号：US11203473
申请日：2005-08-11
申请人： David Steed , Martin Johnson
发明人： David Steed , Martin Johnson
IPC分类号： H04B1/16
CPC分类号： H04B1/28
摘要： A multi-channel superheterodyne receiver employs a low intermediate frequency (IF) and both high-side injection and low-side injection of a selected local oscillator (LO) signal into the mixer in order to position image frequencies outside the passband of a single image reject filter. Any channel that falls within a used portion of the image reject filter passband can be downconverted with image rejection if the utilized bandwidth portion is no greater than about 4 times the IF minus the bandwidth of a channel in the filter passband. Low side injection is used for channels falling within the lower half of the passband of the image reject filter, while high-side injection is used for channels falling within the upper half thereof. The image always remains outside the passband and the receiver can accommodate a greatly increased number of channels.
摘要翻译：多通道超外差接收机采用低中频（IF），并将所选择的本地振荡器（LO）信号的高侧注入和低端注入混频器，以将图像频率定位在单个图像的通带之外拒绝过滤器如果所使用的带宽部分不大于IF的大约4倍，而不是滤波器通带中的信道的带宽，则落入图像拒绝滤波器通带的使用部分内的任何信道可以被镜像抑制下变频。低边注入用于落在图像抑制滤波器通带下半部的通道，而高边注入用于落在其上半部分的通道。图像始终保持在通带外，接收器可以容纳大量增加的通道数。

3. 发明授权

US07103086B2 Frequency hopping data radio 失效
公开(公告)号：US07103086B2
公开(公告)日：2006-09-05
申请号：US09968294
申请日：2001-10-01
申请人： David Steed , Hugh Nielsen
发明人： David Steed , Hugh Nielsen
IPC分类号： H04B1/707
CPC分类号： H04B1/713
摘要： Systems and methods that utilize a received signal to provide low cost, low power, high sensitivity radio frequency hopping communication. A transmitting system prepares a data packet that is to be communicated to a receiving system. The data packet includes a header, a network identification, and transmission data. A transmission frequency is identified and a phase lock loop (“PLL”) is set to the transmission frequency. The data packet is gathered, and frequency modulation and Differential Manchester encoding is performed. The signal is sent through a power amplifier and an antenna to a receiving system, which continually scans all channels of a frequency range for a valid signal. When a pulse is received, the signal is passed through a low noise amplifier, mixed down to 10.7 MHz, passed through one or more filters and one or more high gain amplifiers, mixed down to baseband, sent through a low pass filter, and then sent through a comparator. If an appropriate pulse width, expected bit pattern and a valid header are received, it is determined that the signal is valid and the entire data packet is demodulated to receive the transmitted data.

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