Arrangement for compensating for temperature dependent performance characteristics of surface acoustic wave filter

A double superheterodyne receiver, comprising:

• a first local oscillator for generating a first local frequency;
• a first mixer which receives an incoming radio frequency signal and said first local frequency, said first mixer generating a first IF signal;
• a first IF filter being coupled to receive said first IF signal and having a center frequency which deviates with ambient temperature;
• a second local oscillator for generating a second local frequency;
• a second mixer which receives an output of said first IF filter and said second local frequency, said second mixer generating a second IF signal having a predetermined frequency value;
• and
• a controller which detects ambient temperature and generates first and second control signals using temperature data, said first control signal being applied to said first local oscillator for controlling said first local frequency in such a manner that the frequency of said first IF signal varies and follows deviations of said center frequency, said second control signal being applied to said second local oscillator, and being effective for maintaining the frequency of said second IF signal at said predetermined frequency value irrespective of frequency variations associated with said first IF filter.