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Showing posts with label Communication. Show all posts
Showing posts with label Communication. Show all posts

Critical Importance and Application of a Modern SATCOM Antenna

If you’ve been following along with major technological advances in the global communication industry, then you’ll probably more than a little bit familiar with the concept of SATCOM communications provided by elite level devices and SATCOM antenna systems.

image by Wikipedia 

Philosophically similar to modern cell phones and wireless networks for voice and data communication, proper equipment that have been outfitted with the right SATCOM antennas can give you a distinct edge and advantage over the mobile applications in ways that you may not have imagined before. Literally connecting you to a global communication network – without any of the headaches and hassles of traditional mobile and wireless communications (or even legacy technologies like hardline communications).

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dsPIC 33F128MC706 NUE-PSK Digital Modem

dsPIC NUE-PSK Digital Modem

PSK31 is one of the latest communications modes to capture the interest of hams worldwide. Its inherent ability to dig out low, near-inaudible signals is ideally suited for low power QRP enthusiasts. The PSK31 digital modem engine, however, requires intense DSP processing that is only commonly available in PC sound card. Thus the PSK operator desiring portability for field operation is locked into using a laptop computer as a controller, which results in a cumbersome station.

This project shows you design and construction of a standalone, battery-operated digital modem using a Microchip dsPIC microcontroller. The project includes a character display for transmit and receive text data, and a graphic display showing band spectrum and tuning indicator. Using GPL open source software, the modem can be homebrewed for less than $50 parts cost. When coupled with an SSB-capable transceiver or with a popular PSK-xx transceiver board from Small Wonder Labs, you too can have an effective portable PSK31 station.

© George Heron and Milton Cram

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Project documentation


tag : Digital Modem, PSK, DSP, MCU dsPIC33F128MC706, Communication


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