发明名称 |
Handheld two-way radio with digital selective calling |
摘要 |
A preferred embodiment of the present invention generally comprises a hand-held two-way radio employing digital selective calling. The hand-held two-way radio further comprises a VCO operative to modulate the radio signal frequencies of a guard channel such that the guard channel can be changed by changing the output of the VCO. In addition, the present invention comprises a hand-held two-way radio comprising circuitry operative to function according to the digital selective calling international standards, and a VCO operative to modulate the radio signal frequencies of a guard channel such that the guard channel can be changed by changing the output of the VCO. A fourth embodiment of the present invention comprises a hand-held two-way radio comprising circuitry operative to send and receive GPS data, and a VCO operative to modulate the radio signal frequencies of a guard channel such that the guard channel can be changed by changing the output of the VCO.
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申请公布号 |
US2002025791(A1) |
申请公布日期 |
2002.02.28 |
申请号 |
US20010812793 |
申请日期 |
2001.03.20 |
申请人 |
ENGLERT JOHN W.;HOFFMAN STEPHEN J. |
发明人 |
ENGLERT JOHN W.;HOFFMAN STEPHEN J. |
分类号 |
H04B1/28;(IPC1-7):H04B1/26 |
主分类号 |
H04B1/28 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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