Circuit for controlling a radio-frequency output voltage level a

Details Circuit for controlling a radio-frequency output voltage level a Circuit for controlling a radio-frequency output voltage level a

1995-08-10

1998-03-03

Vo, Nguyen T.

Telecommunications

Wireless distribution system

455 9, 455 671, 455127, H04H 100

Patent

active

057246459

ABSTRACT:
In a circuit for controlling an RF output voltage level and identifying the continuity of an IFL cable using a low frequency signal, the low frequency signal is transmitted to an outdoor unit after being level-controlled in an indoor unit. The level of an intermediate frequency transmission (IF TX) signal input to a transmit block up-converter (TBU) is controlled using the low frequency signal so that the RF output voltage level output from a solid state power amplifier (SSPA) is finally controlled. The low frequency signal is transmitted back from the outdoor unit to the indoor unit, and the indoor equipment detects the signal, thereby identifying the presence or absence of an abnormal connection of an IFL cable. An EIRP adjustment circuit is simplified without a microcomputer and its pheripheral circuits, by using a low-frequency signal which is not damaged by a communication cable. Also, the attenuation of the IF TX signal due to the communication cable is automatically compensated. Since the presence or absence of the abnormal connection of the IFL cable can be easily identified indoors using a visual signal, it is possible to detect abnormal components quickly at the time of when the problem occurs in the system, thereby saving the time for repairing the malfunction.

REFERENCES:
patent: 5386587 (1995-01-01), Yuzawa
patent: 5432501 (1995-07-01), Yoon

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