anodes of diodes 11 and 13 at points b and d and a center tap 18 adapted for receiving video pulse inputs from a bi polar pulse source 20 pulses from source 20 are coupled through the winding of t2 the diode bridge the winding of t1 and back to source 20 through center tap 16 to ground the other winding of t2 is coupled on one side to circuit common and on the other side to provide an output signal the output is developed across the resistive load 22 to ground or common the rf pulse input to the double balanced mixer normally consists of a narrow burst of rf energy the carrier frequency being in the order of 60 mhz present for a duration as short as 50 nanoseconds a bi polar video pulse that swings above and below ground is applied to the video input and is termed a 34 split pulse 34 the center of the split pulse is referenced to the center of the rf input pulse as shown in fig3 during the first half of the split pulse a positive voltage e is applied to the center tap of transformer t2 causing diodes 11 and 13 to be turned on forward biased and diodes 12 and 14 to be cut off reversed biased as a result the transformers t1 and t2 become connected as shown in fig4 without the dashed lines dashed lines bc and ad are effectively open circuited by the reverse biased diodes 12 and 14 while solid lines ab and cd are effectively short circuits created by.