The transmission of analog data, from individual elements of an acoustic array for beam‐forming, places stringent requirements on the transmission system. A 40‐channel telemetry system has been developed, utilizing synchronous sideband frequency‐division multiplexing techniques. The transmitted carrier frequencies are synchronously generated with a PRN generator driven by a master clock. The master‐clock frequency and two unused carrier frequencies are transmitted with the data channels. The receiver carrier frequencies are generated with another PRN generator, driven by a signal at the recovered master‐clock frequency, and are phase‐locked with the two recovered carriers. This technique minimizes the required transmission bandwidth, and affords a dynamic range greater than 40 dB. Measurement and performance data indicate that the transmission system does not affect the generation of beam patterns. [This work was performed under contract with the U. S. Department of the Navy, Bureau of Naval Weapons.]