- 104-B 5kW Radiotelephone broadcasting equipment. Partial prints and pictures from this 1927-28 radio system. A is for water cooled B is for air cooled. Stanley B Adams
- pages 94 through 123 - 3.2M
** 310-A and B Radio Telephone Broadcasting Equipment* -100 to 250 watts- by Stanley B Adams
- 504A-1 Synchronized Frequency Modulation Radio Transmitting Equipment, 3000 Watts, 42 to 50 Megacycles. This brochure describes the 504A-1 FM transmitter that operated in the "original" FM band. Synchronized frequency modulation refers to the unique automatic frequency control.
"In synchronized frequency modulation, the total number of cycles is, in effect, counted, compared with the number of cycles generated by a precise fixed frequency standard, and the tuning of the variable oscillator adjusted mechanically to keep the two always at exactly the same value." The carrier is divided by 8,000 and compared with a 5kHz reference crystal oscillator.
- L5 Coaxial Carrier System provides 10,800 4kHz message channels per coax pair. 1974. 15.8MB
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