The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 09, 1996
Filed:
Mar. 18, 1994
Applicant:
Inventors:
Akiko Nonoyama, Tokyo, JP;
Yuji Goto, Tokyo, JP;
Assignee:
NEC Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
455-32 ; 455132 ; 455140 ; 455141 ; 4551821 ; 4551831 ; 4551971 ; 455289 ; 455314 ;
Abstract
In an earth-based receiving station for receiving radio signals transmitted from a satellite relay station, a common first frequency converter and at least two receivers are provided. One of the receivers is used as a control receiver to receive a CSC carrier frequency transmitted from the satellite, to generate a first local oscillator frequency phase-locked to the CSC carrier frequency, and to supply the first local oscillator frequency to the common first frequency converter. Other receivers are used as channel receivers for receiving channel frequencies. In case when the control receiver is in trouble, any other receiver can be used as a control receiver.