Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Patent
1989-06-14
1992-04-28
Kuntz, Curtis
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
455115, 455226, 455314, 455 675, 4552261, H04B 1700
Patent
active
051095351
ABSTRACT:
An apparatus for a transmission-reception simulation test between a transmitter and a receiver located in the same station includes a testing device coupled to the transmitter and the receiver. The testing device includes, a first frequency converter for microwave frequency to microwave frequency conversion for producing a mixed signal of the output signal of a transmitter having a frequency f.sub.rf1 and a second local oscillator signal having a frequency f.sub.l2, a low-pass filter, and a second frequency converter for intermediate frequency to microwave frequency conversion for producing a mixed signal of the output signal of the low-pass filter and a first local oscillator signal having a frequency f.sub.l1, the output signal of the second frequency converter having a frequency f.sub.rf2 being supplied to a receiver.
REFERENCES:
patent: 4048564 (1977-09-01), Gleeson, Jr.
patent: 4361904 (1982-11-01), Matsumura
patent: 4443661 (1984-04-01), Kubo
patent: 4580274 (1986-04-01), Debany, Jr. et al.
patent: 4972275 (1990-11-01), Spitz et al.
Gotou Haruhiko
Kume Tomiyuki
Fujitsu Limited
Kuntz Curtis
Pham Chi H.
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