Method for optimizing the bandwidth of a radio receiver

• US 4,045,740 A
• Filed: 10/28/1975
• Issued: 08/30/1977
• Est. Priority Date: 10/28/1975
• Status: Expired due to Term

• Current Assignee: The United States Of America As Represented By The Secretary Of The Army
• Original Assignee: The United States Of America As Represented By The Secretary Of The Army
• Inventors: Baker, Kenneth L.
• Primary Examiner(s): Safourek, Benedict V.
• Assistant Examiner(s): Masinick, Michael A.
• Application Number:
  US05/625,807
• Time in Patent Office: 672 Days
• Field of Search: 178/DIG. 19, 333/70 R, 333/70 A, 325/477, 325/427, 325/489, 325/490
• US Class Current: 455/266
• CPC Class Codes: H03G 5/14 in frequency-selective amplifiers
• CPC Class Codes: H04B 1/163 Special arrangements for the reduction of the damping of resonant circuits of receivers amplifiers H03F; negative impedance networks for line transmission systems H04B3/16
• CPC Class Codes: H04B 1/28 the receiver comprising at least one semiconductor device having three or more electrodes

Abstract

A method is disclosed for optimizing the bandwidth of a radio receiver cale of receiving widely varying input data rates. The method may be utilized with known superheterodyne receivers having certain modifications to allow for the ability to vary the intermediate frequency and the center frequency of the associated bandpass filters over a continuous range of values. The method includes the steps of determining the optimum intermediate frequency bandwidth for a given input data rate, adjusting a tunable bandwidth filter to a center frequency which is a predetermined multiple of the desired intermediate frequency bandwidth, and producing an intermediate frequency equal to the tuned frequency of the filter.

Claims

1. A method for optimizing the bandwidth of a radio receiver over a continuous range of input bit rate values, comprising the steps of:

determining the optimum intermediate frequency bandwidth for a given input data rate,

adjusting a constant Q continuously tunable bandwidth filter to a tuned frequency which is a predetermined multiple of the desired intermediate frequency bandwidth, and

adjusting the intermediate frequency until it is equal to the tuned frequency of the filter.

2. The method of claim 1 wherein adjusting the filter includes adjusting a tunable N% bandwidth filter to a tuned frequency which is 100/N times the desired intermediate frequency bandwidth.

3. The method of claim 2 wherein determining the optimum intermediate frequency bandwidth includes determining a bandwidth which is numerically equal to twice the bit rate.