Loop testable radio transmitters/receivers

Details Loop testable radio transmitters/receivers Loop testable radio transmitters/receivers

1993-07-30

1995-08-15

Urban, Edward F.

Telecommunications

Transmitter and receiver at separate stations

Having measuring, testing, or monitoring of system or part

455115, 455 84, H04B 1700

Patent

active

054428114

ABSTRACT:
A loop testable radio transmitter/receiver includes a transmission system which includes a transmission frequency converting unit and a transmission signal filter unit. A receiving system is provided, including a receiving signal filter and a receiving frequency converter. The transmitter/receiver further includes a transmitter/receive sharing unit, a transmission signal looping unit for attenuating the transmission signal of the transmission system and for looping back it to the receiving system, and a shifter arranged to the output side of the receiving frequency converting unit in the receiving system for converting an intermediate frequency of a signal converted by the receiving frequency converting unit into the receiving input frequency of a modulator/demodulator.

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