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A Miniature Radio Receiver for Police Use by Lawrence H. Smith, Radio Technician, Police Department, Atlantic City, N. J. FBI LAW ENFORCEMENT BULLETIN Date? probably 40s or
50s
The Atlantic City Police Department now has in successful use a tiny radio receiving set concealed in a patrolman's cap over which he receives all calls emanating from the headquarters transmitter. The receiver weighs less than 2 ounces. Together with the batteries, antenna, and earpiece, the weight is 6 Ounces. Including the cap and badge, the entire ensemble weighs 15 ounces. By using a special lightweight cap, with an aluminum or plastic badge, together with a few contemplated changes in the design of the receiver, we hope to soon cut this weight by approximately 3 ounces. The receiver is in an aluminum case, 1 'V7/8 inches square and 1 inch thick. It is concealed in the peak of the cap behind the badge. Operation is from hearing-aid batteries located in the brim to give equal weight distribution. The sound is carried to the ear by a small Telex earpiece concealed in the brim to which is connected a short piece of sound tubing which carries the voice outside the cap and into the ear. Volume control is obtained by adjusting the tubing closer to the ear or farther away.Batteries and Tubes The "A" battery used will give continuous operation for 7 hours, the "B" battery lasts from 7 to 10 8-hour days. Four Raytheon subminiature tubes are utilized READ THE PAGES BELOW FOR THE REST!
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