Tunable trigger acquisition system and method for making in-serv

Details Tunable trigger acquisition system and method for making in-serv Tunable trigger acquisition system and method for making in-serv

1993-10-20

1996-02-20

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

324 7627, 348180, H04N 1700, H04N 710, H04N 704

Patent

active

054932092

ABSTRACT:
A spectrum analyzer (50) has a tunable trigger acquisition system (52) that includes a selectable trigger acquisition bandwidth. Sufficiently wide signal acquisition bandwidth is obtained by tapping into a high-frequency IF amplifier (54) signal and down-converting it to a moderate IF frequency for trigger extraction. A down-conversion local oscillator (62) is phase-lock-loop (64) tunable over a range of the high IF frequencies to allow extracting a time and frequency selectable trigger from the desired carrier signal frequency even if the spectrum analyzer is substantially offset in frequency from the desired carrier. The moderate frequency IF amplifier (66) includes a switchable bandpass filter (68) that provides adequate selectivity to detect triggers from a variety of signal types while rejecting unwanted signals such as adjacent channel CATV carriers that are often detectable when the measurement frequency is offset toward the channel edges.

REFERENCES:
patent: 3949312 (1976-04-01), Markowitz
patent: 4721997 (1988-01-01), Wittrock
patent: 5073822 (1991-12-01), Gumm
patent: 5210483 (1993-05-01), Amamoto
patent: 5233418 (1993-08-01), Gumm

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