Switched diversity method and apparatus for FM receivers
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United States of America Patent
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-
Jan 21, 1986
Issued Date -
N/A
app pub date -
Feb 13, 1984
filing date -
Dec 27, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An FM diversity receiver system and method are disclosed which include two antennas and a switch for switching the receiver from one antenna to the other. A fade control signal is produced which is related to the received FM signal, in which fade control signal both multipath and non-multipath disturbances are manifested. Disturbances in the fade control signal are compared with a threshold voltage and, when the disturbance exceeds the threshold voltage, antenna switching is momentarily prevented to prevent antenna switching in response to electrical noise impulses, such as ignition noise, which are shorter than the period during which antenna switching is momentarily prevented. If the fade control signal disturbance continues to exceed the threshold voltage after the momentary period of disablement, the threshold voltage is reset to a level related to the maximum level of the fade control signal disturbance, after which antenna switching takes place. Antenna switching then is again momentarily prevented; this time to prevent antenna switching in response to switching transients produced during the antenna switching operation.
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