DV-Mega GMSK modem and UHF transceiver, DVSTICK-30 USB Codec

DVmega DVSTICK-30 New

Participate on the D-Star or DMR network with a radio, only with a USB Vocoder!

DVmega DVstick-30

All digital modes in ham radio require a voice codec (coder/decoder aka vocoder (voice codec)). The purpose of a codec is the transformation of voice into a digital data stream and vice versa, from digital information to analogue voice. During this transformation much happens inside the codec than just an analog/digital conversion. The goal is to reduce the data rate as muich as possible, because this will require less bandwidth in the limited radio spectrum. This is achieved by reducing and compressing voice in various ways, on the analog and digital side. These procedures are quite elaborate and hard to develop and therefore protected by patents. The developer then pours her ideas in a hardware chip and sells this to manufacturers of radios and other devices.

Since the digital ham radio systems borrow technology from commercial systems, also the codec definitions have been adopted. Although there are free open source codecs out there (free as in free speech, not as in free beer), these free codecs are not compatible with commercial systems because they use others procedures. So we have to live in ham radio with these existing commercial codecs. Every digital radio for D-Star, DMR, P25, C4FM, NXDN etc contains such a codec chip, you buy it with the radio. Now, if you want to participate with using an actual radio, you still need such a codec chip to transform the digital data. This is exactly what the DVMEGA DVstick-30 does.

The DVMEGA DVstick-30 contains a codec by the manufacturer DVSI, the AMBE-3000©. This is a state-of-the-art codec chip, which supportes various encoding systems. The result is that you can use the DVstick-30 with suitable software with different systems like DMR or D-Star, in the furure maybe als owith other systems as software deveops.
A suitable software for use with the DVstick-30 is Blue DV by PA7LIM. This software is available for a lot of platforms like Windows, some IOS versions (Ipad, Iphone) and Linux, and with suitable hardware (OTG capable) even on Android and IOS. You further need a headset or microphne and speaker for your computer, or you use the built in mic/speaker of your notebook. PTT keying is done through a button of the software. Another software is OpenDV by DL5DI, but this requires more work like compiling the software yourself.

The benefit of such a 'radio less' application in ham radio is the possibility to stay in touch with the friends at home when you are traveling without a radio, or wehen no suitable digital repeaters are nearby. The requirements for the internat data rate are - thanks to the capable codec chip - quite low, usually an ISDN line with 64 kbps is absolutely sufficient.

  • DVstick-30 Features
  • USB 2.0 Full Speed Interface
  • Power supply by USB
  • UART baudrate 28k8 - 460k8
  • Data rates adjustable from 2k0 to 9k6
  • AMBE-3000 full-duplex AMBE+2™ Vocoder chip by DVSI
  • Compatible with BlueDV, AMBE-Server, Dummy Repeater(Open DV) and others
Order No.
DVMEGA-DV30 DVstick30 USB AMBE Codec 105.00 € Add to shopping cart New In stock, shipped in 1 or two days.
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DVMEGA-UHF / DVMEGA-DUAL Transceiver Board for Raspberry Pi

The boards DVMEGA-UHF and DVMEGA-DUAL are daughter cards 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.

DVMEGA-UHF

The DVMEGA 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 144 to 148 (DVMEGA-DUAL) and from 430 to 450 MHz (DVMEGA-DUAL and DVMEGA-UHF). The DVMEGA 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, that due to the flexible 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 € Add to shopping cart In stock, shipped in 1 or two days.
DVMEGA-DUAL VHF/UHF Transceiver for Raspberry-Pi 139.00 € Add to shopping cart In stock, shipped in 1 or two days.
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BlueStack-Micro Plus: Bluetooth Adaptor Board for DVMega New

BlueStack-Micro Plus

Universal adaptor for DVMega raspberry-pi boards. It connects via Bluetooth to your Android device using the free App BlueDV. It can communicate to a PC via the USB-port for use with MMDVM-host or G4KLX software (PC-dongle function). Also it features easy firmware updates of DVMEGA boards via USB.

  • Bluetooth to Android
  • USB to PC for G4KLX or MMDVM-host software
  • USB adaptor for upgrading DVMega firmware
Order No.
DVMEGA-BS.A BlueStack-Micro Plus for Android 43.00 € Add to shopping cart New In stock, shipped in 1 or two days.
DVMEGA-BS.I BlueStack-Micro Plus for IOS/Iphone 51.00 € Add to shopping cart New In stock, shipped in 1 or two days.
DVMEGA-BB01 Case for BlueStack and DVMEGA (Color: gray) 15.60 € Add to shopping cart New In stock, shipped in 1 or two days.
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Case for BlueStack (and DVMEGA)
Link: Interesting Software Project for BlueStack MicroPlus: Blue DV by PA7LIM

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.

DVMEGA-GMSK Modem Principle Principle of operation DVMEGA GMSK Modem

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.

DVMEGA GMSK Modem

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.

Order No.
DVMEGA-GMSK GMSK Modem for Arduino 63.00 € Add to shopping cart In stock, shipped in 1 or two days.
42925.6 mini DIN connector full metal 6-pin 8.90 € Add to shopping cart In stock, shipped in 1 or two days.
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