D-STAR and DMR HotSpot

DV4mini news (D-STAR and DMR HotSpot):

Advance Notice

NEW! Production has started, price and lead time will be announced after


One of the first (or even the first?) D-Star and DMR Hotspots worldwide!

Reservations: If you want to be part of the first production run you can reserve a DV4mini (not binding).
Just send us a note using the contact form of the shop.
We will then reserve the quantity and you will be notified at your email address as soon as an official order can be made. 

DV4mini is a tiny but powerful USB stick that can change any PC into a HOTSPOT for the modes D-Star and DMR (C4FM Fusion is being prepared).
It contains a powerful 32-bit micro controller as well as a complete 70cm transceiver and modulator/demodulator for GMSK and 4FSK (including raised cosine) as well as a USB interface.
It does not require its own power supply as it is powered through the USB interface.
Thanks to a power saving voltage transformer even older USB interfaces will suffice.
It will be shipped with a comprehensive but simple to use software package which allows for the linking with DCS reflectors for both D-Star and DMR reflectors.

For Digital Voice enthusiasts: your handheld radio is no longer gathering dust.
This hotspot brings the D-Star or DMR reflector directly into your shack.

For DV Power Users: It is possible to plug several of these sticks into a PC, thus allowing simultaneous operation with several reflectors (even D-Star and DMR mixed).
Well if you so desire you can fully use all your USB sockets with DV4minis and create a DV Center that way.

For home brewers: the DV4mini runs well on single board computers e.g. Raspberry, BananaPi, Odroid etc.
The minimum requirement is a Dual-Core. Such a hotspot would only need a few Watts and be useable in continuous service.

For developers: The interface between the PC and the DV4mini is disclosed.
With the DV4mini one can transmit and receive digital data in the 70cm band, without regard to the mode, as long as the mode is coded for GMSK or 4FSK.
That means one cannot only transfer digital voice but also data. Your phantasy is the limit.

For vacationers: due to the tiny size it can be brought with you on your vacation and thus create a hotspot in your hotel.

Technical specs:

Output Power: approx. 10mW
Modulation types: GMSK, 4FSK
Operating modes: D-Star, DMR, (C4FM Fusion in process)
Harmonics: better then -60dB

Sensitivity: -120dBm
Modulation types: GMSK, 4FSK
Operating modes: D-Star, DMR, (C4FM Fusion in process)

Digital specs:
Data rates: 9600 or 4800 Baud, depending on the operating mode
Bit rate HF: 4800 bit/s or 4800 dibits/s
TCXO: long term stability: better than 2.5 ppm
TCXO: short term stability: better than 1 ppm

USB plug type A to connect direct, no cable needed
Power supplied via USB
Antenna SMA-socket, 50 Ohm (you will need an external antenna which is available in the shop)

DV4mini and dv4mini.exe: Software to create a D-Star and/or DMR Hotspot. Input options for the call sign and the DMR ID number and functions to link to reflectors.
Runs on Windows and Linux
Driver: The driver for Windows is included, Linux does not require one.

Developer Software:
DV4mini Library (in C) licensed under GPL 3.0, open source, includes all functions required to run the DV4mini hardware allowing you to create your own projects.

The DV4mini is a cooperation by:

This Product was added to our catalogue on Thursday 18 June, 2015.

DV4mini USB Stick für D-Star und DMR - HELITRON Online Shop

DV4mini USB Stick für D-Star und DMR: VORANKÜNDIGUNG ! NEU ! DV4mini: Die Produktion ist angelaufen... 

Some of the functionality of MotoTRBO radios utilizes the ISPC extensions, but the core DMR network protocol is the same no matter what brand of radio or repeater is used. But it's my understanding that the item in question is not geared toward use in a "commercial" network environment like DMR-MARC, but rather for use in an amateur network using amateur developed technology, which is common on the Hytera Worldwide DMR network.

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