This paper presents the development and experimental results of the real-time air-gap coupled SAW convolvers

and discusses some of the problems associated with such a convolver.The main performance of our device features an external convolution efficiency of -48dBm

a dynamic range larger than 70dB and a convolution output power larger than-15dBm （load 50*）.Some signal processing experiments （including chirp signal

7 bit Barker code

uniform and non-uniform pulse sequencies

and rectangular pulse） using our convolver have been carried out

and the experimental results are in good agreement with the theories.