<div dir="ltr"><p class="MsoNormal"><b><span style="font-size:15pt;font-family:Helvetica,sans-serif;color:rgb(69,66,69)"><span style="color:rgb(68,68,68)"><a href="http://www.cqdx.ru/ham/new-equipment/dv4minid-stardmr-hotspot-usb-stick/" title="DV4miniD-Star/DMR Hotspot USB Stick">DV4miniD-Star/DMR
Hotspot USB Stick</a></span></span></b><img src="cid:ii_14fd0fa42162267a" alt="Imagem inline 1" width="353" height="138" style="text-align: right;"> <img src="cid:ii_14fd0fb42be48aac" alt="Imagem inline 3" width="72" height="200"></p><p class="MsoNormal" align="right" style="text-align:right"><br></p>
<p style="text-align:justify"><strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">DV4mini</span></strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"></span></p>
<p style="text-align:justify"><a href="http://www.cqdx.ru/ham/wp-content/uploads/2015/08/DV4mini_USB-Stick-2.jpg"><span style="font-size:10pt;font-family:Helvetica,sans-serif"></span></a><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"></span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">DV4miniD-Star/DMR Hotspot USB Stick</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">The DV4mini is a very small but also very capable USB Stick that
can expand any PC into a Hotspot for the D-STAR and DMR modes (C4FM Fusion is
in development).</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">It consists of a powerful 32 bit micro controller, a complete 70
cm transceiver and a modulator/demodulator for GMSK and 4FSK (incl. Raised
Cosine) and also a USB interface.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">The DV4mini does not require external power as it is powered via
the USB interface. The DV4mini is supplied together with a simple to use and
comprehensive software package. This allows linking with DCS, XRF and REF
reflectors for D-STAR as well s DMR reflectors.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Many hams have a DV capable transceiver but cannot reach the
closest DV repeater. With the DV4mini it has become possible to create a
hotspot with minimal resources and thus get access to the DV network. We are
talking about a small board inside a USB stick with a SMA antenna socket.</span></p>
<p style="text-align:justify"><a href="http://www.cqdx.ru/ham/wp-content/uploads/2015/08/DV4mini_USB-Stick-1.jpg"><span style="font-size:10pt;font-family:Helvetica,sans-serif"></span></a><strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">System
requirements:</span></strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"></span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">These components are a prerequisite:</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">1. DV4mini USB stick</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">2. PC Software: DV4mini Control Panel</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">3. A DV capable radio (D-Star, DMR)</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">4. A PC with Windows XP, 7, 8.1, 10; Linux on a PC or an ARM
computer like a Raspberry, Banana Pi or Odroid.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">5. Internet access</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">The DV4mini will be connected thru the USB interface with a PC
or a single board computer and the required software will be installed. After
starting and setting up the software one now has a Hotspot for the 70 cm band
and can use it with a D-STAR or DMR transceiver.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">This picture shows a DV4mini connected to a Raspberry PI 2 Mod.
B:</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">DV4mini connected to a Raspberry PI 2 Mod. B</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">On the upper right is a WLAN stick and below it the DV4mini. In
addition there are also connections to a keyboard, a mouse and a HDMI display.
This configuration allows for a power saving continuous operation at low
expense.<br>
Reflectors:</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">A reflector is a server connected to the Internet or Ham Net and
is linked to a number of digital Ham Radio repeaters. If one of these repeaters
is active it will send the voice data stream to the reflector. The reflector
sends a copy of these voice data to all of the connected repeaters. This means
that a QSO can be heard on all connected repeaters simultaneously.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Thus the chance to find a QSO partner is considerably increased
– which is one of the reasons relectors are quite popular.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Today the following systems are in operation:</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">DCS (Digital Call Server):</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">DCS is the most modern D-STAR reflector system and in worldwide
use. Many countries use their own reflectors which differ from each other by
their 3 digit number. (DCS001, DCS002 etc).</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Each DCS reflector has 26 rooms which are allocated to various
regions of a country or continent. These rooms (A to Z) have been given names
to make their identification easier and are shown on the user surface of the
DV4mini.</span></p>
<p style="text-align:justify"><strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Xreflector:</span></strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"></span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Xreflectors are the second generation of D-STAR reflectors and
no longer widely in use. However in some countries like Italy they are still
used as the hams have not yet agreed to a uniform concept.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Also Xrelectors have less ports over which simultaneous QSOs be
run. Xrelectors are named XRF001, XRF002 etc.</span></p>
<p style="text-align:justify"><strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">D-Plus reflectors:</span></strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"></span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">They were the first generation D-STAR reflector system. Although
it is getting old it is still used intensively in a number of countries (mostly
English speaking ones like USA, UK and Canada but even in Germany are a few
operational). D-Plus relectors are named REF001, REF002 etc.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">They also use a number of ports allowing for simultaneous QSOs.</span></p>
<p style="text-align:justify"><strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">DMR reflectors:</span></strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"></span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">DMR reflectors consist of several regional servers that are
connected with each other via a superordinate network. Two nets exist. One
based on Hytera and the other based on Motorola technology. As Hytera is open
towards Ham Radio the DV4mini sticks check into the Hytera based network. In
the meantime there are also some cross connections existing that allow
communication beyond ones net limits.</span></p>
<p style="text-align:justify"><strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Net organization (CCS7):</span></strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"></span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">The many reflectors, repeaters and also Dongle users (the
DV4mini is a Dongle too) require a structured organization, so that the network
technology works properly.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">D-Star works with call signs to identify a station. DMR however
uses numbers. That is why it is necessary that an amateur radio station gets a
number assigned in addition to its call sign and that this call sign – number
combination is known to the network.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Every ham can go to the web site <a href="http://xreflector.net">xreflector.net</a> and request a 7
digit number to be assigned. This number is then entered into the specific
field on the DV4mini software. This facilitates reporting into the network and
conduct worldwide contacts in D-Star or DMR and the use of D-Star/DMR bridges.</span></p>
<p style="text-align:justify"><strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Operating modes:</span></strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"></span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Digital ham radio repeaters are connected via relectors. This
allows for worldwide connections from one repeater to another.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">With a hotspot (DV4mini) one creates ones own connection to this
relector network and gets access to all connected ham radio repeaters.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">The hotspot includes a low power 70 cm transceiver. All voice
communications on the connected reflector will be transmitted by the hotspot on
70 cm and one can listen with a digital radio and of course also transmit.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Thus a hotspot is an ideal solution in one has no good access to
a digital repeater e.g. inside buildings, due to distance or at a vacation
spot.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">For such a hotspot you use your own call sign. Reduce your
transmit power to just enough to cover your living area for reliable
communication.</span></p>
<p style="text-align:justify"><strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Hardware:</span></strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"></span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Use the Hotspot Mode to enter the frequency to be utilized for
DV operation. (check your band plan).</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Your transceiver will be set up for Simplex use – RX and TX on
the same frequency.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">The DV4mini takes the 5 Volt operating voltage from the USB
interface. On a few PCs this voltage however may be too low (we measured below
4.5 V on some). In this case you can’t operate.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">The best solution is then to use a USB adapter with its own
power supply.</span></p>
<p style="text-align:justify"><strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Technical Data:</span></strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"></span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Frequency range: 420-450 MHz<br>
Resolution: ca 250 Hz<br>
RX/TX D-Star: Duplex +/0/- any shift<br>
RX/TX DMR: Simplex (TX=RX QRG) Modulation D-Star: GMSK (Gaussian 2FSK)<br>
Modulation DMRPLUS: 4FSK Raised Cosine<br>
Antenna connector: SMA female 50 Ohm<br>
USB interface: USB type A<br>
Operating Voltage: 4.75 – 5.25 V<br>
Current max RX: 15 mA<br>
TX (with 12 mW) 188 mA<br>
S-Meter 1dBm resolution<br>
accuracy +- 1dBm (> -100 dBm and <-50dBm)</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">DV4mini output power steps: 10 steps</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">0 = 0.03 mW<br>
1 = 0.4 mW<br>
2 = 1.2 mW<br>
3 = 2.4 mW<br>
4 = 3.9 mW<br>
5 = 5.5 mW<br>
6 = 7.1 mW<br>
7 = 8.8 mW<br>
8 = 10.5 mW<br>
9 = 12 mW</span></p>
<p style="text-align:justify"><strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Antenna:</span></strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"></span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Comply with your country’s regulations regarding automatic
operation!</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">The DV4mini requires an antenna. It must not be used without an
antenna. You can use the commonly available ‘rubber ducks’ with a SMA connector
like the ones used with walkies. The DV4mini must not be connected to a high
Yagi or similar antenna.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">If you use a physically adjustable antenna, be careful that when
you adjust the position of the antenna you hold onto the base and not the
housing. Otherwise you may damage the SMA connector. The DV4mini must be used
only when you are nearby. Unmanned operation requires in almost all countries
separate licenses or permits.</span></p>
<p style="text-align:justify"><u><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">ATTENTION:</span></u><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"> Do
not overload the SMA connector when handling the antenna. Always hold on to the
base and not the stick. Damaged SMA connectors are not covered by warranty.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">In order to utilize the stick in many countries the DV4mini
covers a large range of frequencies from 420 to 450 MHz. It is the operators
responsibility to utilize only the frequencies appropriate in his country.</span></p>
<p style="text-align:justify"><strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Copyright:</span></strong><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"></span></p>
<p style="text-align:justify"><em><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">The rights for the DV4mini stick and
its software are reserved with DG8FAC (Stefan Reimann), DG1HT (Torsten
Schultze) and DJ0ABR (Kurt Moraw).</span></em><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"> </span></p></div>