Thesis Archive
A Data Transmission System Using the Subsidiary Communications Authorization for an LED Visual Matrix Display (2007)
Hendrick T. Chua, Alvin G. Esguerra, Wilbert Y. Lao and Theodore Wise T. Tepeng, advised by Roberto T. Caguingin
Abstract:
-Over the years, the possible benefits of using excess bands in the FM spectrum remains untapped, thus limiting the amount of information being conveyed. This thesis utilizes an alternative medium to convey information in the cheapest and most convenient way possible. It makes use of the Subsidiary Communications Authorization (SCA), an excess band in the FM spectrum with a bandwidth of 15 KHz. With a specialized graphical user interface, it enables the user to remotely control the sending of messages from radio stations capable of superimposing an SCA subcarrier signal. Data is received through an FM receiver with an SCA decoder. A microcontroller processes the data. The system employs FSK modulation to convert digital signals into their corresponding form then conditioned by signal conditioning circuits. The decoded message is displayed through an LED visual matrix panel, which could be placed in a location where people can read the message.
Correspondence:
Roberto Caguingin
[email protected]