×

Scanning receiver with manual override of frequency scanning routine

  • US 5,189,413 A
  • Filed: 03/12/1991
  • Issued: 02/23/1993
  • Est. Priority Date: 11/27/1985
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of operating a frequency agile data receiver capable of operating over a wide frequency range, said receiver having stored therein a short list of local data channels, said method including a first mode of operation and a fast scan mode of operation,(a) said first mode of operation having awake and asleep phases, and comprising the steps of:

  • a1) periodically awakening briefly from said asleep phase and listening for data signals on a first data channel;

    a2) if no data signal is received on said first data channel, then checking among said stored short list of local data channels using a fast high energy utilizing first channel locating protocol to locate a data channel on which data can be received; and

    a3) if no data channel is found on which data can be received, switching to a slow low energy utilizing second channel locating protocol and slowly scanning through said wide frequency range at a slow rate to find a data channel on which data can be received, andb) said fast scan mode of operation comprising the steps;

    b1) providing a manually induced stimulus to said receiver which interrupts said first mode of operation; and

    b2) initiates checking among said wide frequency range using a fast relatively high energy utilizing third channel locating protocol to locate a data channel on which data can be received, whereby in response to said manual stimulus said receiver is switched to said high energy utilizing third data channel locating protocol.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×