A MULTIPLE UNIT STEERABLE ANTENNA 



367 



Fig. 21 — This retouched plate shows pulses received with MUSA. On each 

 frame time advances from left to right and is measured by the thousand-cycle 

 timing wave. The center trace shows the output of one MUSA branch steered at 

 25 degrees. The bottom trace shows the output of the second MUSA branch 

 steered at 32 degrees. Wide band amplifiers for pulse reception are bridged in 

 parallel with the speech band intermediate-frequency amplifiers. The transmitted 

 pulses are about 200 microseconds long. GCS (9020 kilocycles) Rugby, February 25, 

 1936, at 4:11 P.M., E.S.T. 



