Title:
RADIO EQUIPMENT
Document Type and Number:
Japanese Patent JP3667977
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To monitor faults not only for a transmission part but also for the transmission route of the transmission waves of a transmission antenna or the like.
SOLUTION: Radio waves due to the creeping of the radio waves emitted from the transmission antenna 7 are received by a reception antenna 8 for checking, the power of the reception signals is converted into a DC voltage in a diode 9, and the voltage level is monitored in a first monitoring circuit 10. By monitoring whether or not a reception signal level is within a prescribed threshold range, the normality/abnormality of the transmission level of the transmission part, the transmission antenna and the transmission line of the transmission waves, etc., can be found.
Inventors:
Masanori Yamamoto
Ujiie Ken
Koichi Kawauchi
Ujiie Ken
Koichi Kawauchi
Application Number:
JP6690898A
Publication Date:
July 06, 2005
Filing Date:
March 17, 1998
Export Citation:
Assignee:
Nippon Signal Co., Ltd.
International Classes:
H04B1/3822; H04B1/40; H04B17/00; H04B17/18; H04W88/02; (IPC1-7): H04B17/00; H04B1/40; H04Q7/34
Domestic Patent References:
| JP7236169A | ||||
| JP3289729A | ||||
| JP2143619A | ||||
| JP60121836A | ||||
| JP5244054A |
Attorney, Agent or Firm:
Tomijio Sasashima
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