by those skilled in the pertinent art the mixers 78 80 essentially function as frequency phase subtractors adders such that the frequency f dds and the phase shift values u03c6 a u03c6 b of the dds output signals u03c6 dds a and u03c6 dds b are subtracted from added to the frequency f in of the rf in signal components a and b thus the rf a out and rf b out signals output by the mixers 78 80 respectively each have a frequency f in f dds f in f dds and respective phases u03c6 out a and u03c6 out b equal to the phases u03c6 in a u03c6 in b of the rf in signal components a and b minus plus the phase shift steps increments u03c6 a u03c6 b of the respective dds output signals i e u03c6 out a u03c6 in u03c6 a and u03c6 out b u03c6 in u03c6 b in this manner the mixers 78 80 may be utilized to downconvert upconvert the incoming rf in signal accordingly if the vpsaw device 70 of the present invention were employed in a beam forming network not shown of a satellite based phased array antenna transmitting system not shown the rf out signal could be made to have the appropriate downlink frequency without the need for a downconverter anywhere in the transmitting system by merely setting the frequency f dds of the dds output signals to the appropriate values further it will be easily and readily appreciated that the vpsaw device.