DVMEGA-GMSK modem for Arduino

The DVMEGA-GMSK board is a modem for GMSK modulation, which is used as a shield for select Arduino hardware. For the construction of a complete Node Adaptor an additional computer (a Raspberry Pi will do) and a radio (9k6 capable) is required.

http://www.dvmega.auria.nl/images/GMSKshield_lowres.png

The DVMEGA GMSK board utilizes the CMX589 modem chip and is used as a shield for Arduino UNO, Arduino Mega 128 or Arduino Mega 2560. The Arduino controls the modem with the help of a freely available software. Received GMSK signals are decoded by the modem and are then transferred over the USB interface to an attached computer. Transmit-wise the digital data is sent from the computer to the Arduino and the modem, which then produces a GMSK signal used to modulate the attached radio. The connection to the radio is done over a standard 6pin MiniDIN Data connector.

A computer program is available for a Windows PC and for the raspberyr Pi. Using Yahoo groups, the author G4KLX offers various programs like ircDDBGateway and the PCrepeaterController. With these programs and above mentioned hardware a local hotspot for digital modulation can be built. The benefit is, that due to the use of a software programmable modem on the Arduino, the function can be adopted to future developments. For example it would be possible to extend the function of the modem not only to Icoms D-Star mode, but also to Yaesus 'System Fusion' C4FM modulation or other digital systems (e.g. DMR).

Please consider your local regulations concerning the construction and use of such radio systems. The combined products do not have a CE mark and should only be used by licensed radio amateurs.http://www.dvmega.auria.nl/images/GMSK_set.png

 

 

    

 

 

 

 

Order No.
DVMEGA-GMSK GMSK Modem for Arduino 63.00


DVMEGA-UHF Transceiver Board for Raspberry Pi

The board DVMEGA-UHF is a daughter card for the Raspberry Pi. In combination with this single board computer it becomes very easy to construct an entire radio solution for a low power D-Star Node Adaptor.

The DVMEGA-UHF transceiver board utilizes the chip ADF7021. This IC constitutes a complete transceiver for digital data with GMSK modulation. The control of the transceiver chip is handled with a local ATMEGA 328 on the same board. The result is a flexible digital transceiver component with low power for the frequency range from 430 to 450 MHz. The DVMEGA-UHF board handles the radio side and the modulation/demodulation part, the Raspberry Pi is used for the protocol handling of D-Star (and future digital modes).

The software for the Raspberry Pi is available in a Yahoo group. here G4KLX offers programs like ircDDBGateway and the PCRepeaterController. With these programs and the above mentioned hardware it becomes very easy to construct a local low-power hotspot for digital modes. The benefit is, tha tduie to the dlexible construction and software future developments can be made available as well.

Please consider your local regulations concerning the construction and use of such radio systems. The combined products do not have a CE mark and should only be used by licensed radio amateurs.

Order No.
DVMEGA-UHF UHF Transceiver for Raspberry-Pi 94.00

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