The HSCA and The Acoustics
•All police radio communications that day were recorded and kept.
•Channel 1 for regular operations. Channel 2 for the motorcade.
•Low-grade voice recorders, dictabelt and audiograph. From 200–250 cps to 2400–2500 cps.
•Given to FBI right after
assassination, returned to DPD in March 1964 and placed in safe. Officer Paul McCaghren took
them home years later for safe keeping.