Multibrand radar detector having plural local oscillators
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United States of America Patent
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Aug 28, 1990
Grant Date -
N/A
app pub date -
Sep 12, 1988
filing date -
Dec 23, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention concerns radar detection devices sensitive to signals from various different frequency bands. A broad band antenna is provided, together with a mixer and a plurality of local oscillators. Signals from the local oscillators are mixed one at a time with signals from the antenna, there being one local oscillator signal for each radar frequency or pair of frequencies of interest which may be received by the antenna. Each local oscillator signal is chosen so that when it is mixed with the respective radar frequency signal, an intermediate signal is produced which is the same for all mixtures. This intermediate signal is further down converted and fed to signal processing circuitry to produce an alarm when radar frequencies of interest are detected.
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