![Receivers](button275.jpg)
Arinst Dreamkit V2D
In
the fall of 2021, I discovered an interesting receiver on the online
store AliExpress. The Arinst SDR Dreamkit V1D. At first I thought it
was another one of the many Chinese radios. But after some research
it turned out that "Arinst" is a Russian manufacturer of portable
spectrum analyzers. The variety of functions and especially the
display stood out from the crowd. So I bought this radio. After
about three weeks the V1D arrived at my place. The package was not
shipped from China, but from Kazakhstan. The V1D made a solid and
noble impression. Especially the scalable and configurable display
was the fantastic. The receiver covered a large frequency range, but
unfortunately without any preselection. On shortwave, a lot of FM
stations could be heard. Even on higher frequencies, undefinable
stations were received that clearly did not belong there. Apart from
that, the reception was good and clean. For my requirements this
radio was then nevertheless not the correct one. In addition, there
was a display defect that caused me to contact the manufacturer
directly. I immediately told them about my experience with the V1D.
I was surprised how fast the answer came.
After a short mail exchange, Arinst offered to send me the new "V2D"
in exchange for paying the difference in price. After about 3 months,
the V2D arrived.
![](Arinst_V2D-(20).jpg)
Unpacking
and inspection
Now the V2D has arrived and I am curious what to expect. The
first thing that caught my eye was the enclosed quick start
guide. Unfortunately, it is only in Russian. Who does not know
this language, will have problems to read the manual. A white,
very small and unwieldy touch pen was also included, and I
wasn't convinced of its quality. There was also an SMA extension
piece in the cardboard box. This is there to protect the SMA
connector of the device after a request to Arinst. Not to forget
the important USB-C cable, for software updates, control and to
be able to charge the battery.
Charge battery? There was something...! There is no battery
installed at all! Supposedly, devices are no longer allowed to have
lithium batteries installed if they are shipped by airmail. That was
the info from Arinst. So I had to get a suitable battery before the
V2D arrived. On the online store AliExpress I found it quickly. This
battery came already with matching plug. But attention! Install,
connect and put into operation is not advisable! Otherwise the
device will be destroyed. First you have to change the polarity of
the plug. For untrained hands this is not easy to do. You have to
loosen the locking of the plug sleeves of the small plug with a
sewing needle or suitable tool, pull it out and then swap the slot.
Simply put, you have to reverse the polarity of the plug! After
that, the device is disassembled and the battery is installed under
the display. It is fixed with double-sided adhesive tape, which was
already pre-mounted.
See red circle. The plus (+) cable must be on the left side of the
plug.
![](Arinst_V2D-(19).jpg)
The exterior of the Arinst V2D makes a solid impression. It has a
powder-coated aluminum casing and the inscriptions were burned in
with a laser. The resistive touchscreen is easy to read, bright and
sensitive to touch. The case has an overall high-quality feel. The
end covers on the left and right sides are made of PCB material,
which are coated with tin on the inner surface. This is to prevent
interference radiation from escaping. On the right side is the
tuning button, the USB-C port, and a status LED that indicates
charging. When this goes out, the battery is charged. The left side
of the V2D houses the SMA antenna connector, the power button, and
the 3.5mm stereo jack. A status LED indicates when the display is
off. A small 2W speaker is built into the back.
The main
technical data of the V2D
Firmware V2.12
-- Frequency range: 100 kHz - 2800 MHz
-- Bandwidth spectrum baseband: 1 - 2 -
3 - 5.3MHz
-- Bandwidth IF spectrum: 25 - 50 - 100
- 250 - 450KHz
-- Frequency resolution: 1Hz
-- ADC bit depth: 16bit
-- Sensitivity: 0.25 uV
-- Control range of low noise amplifier:
0-30dB
-- Control range of attenuator: 0-30dB
-- Input impedance 50 Ohm switchable to
HI-Z
-- Reference oscillator TCXO: ±0.5 ppm
-- Operating modes: CW, AM, AMS, LSB,
USB, DSB, NFM, WFM/STEREO/RDS
-- Fixed filter bandwidths for WFM: 100,
200, 300, 400 kHz
-- Adjustable filter bandwidths for WFM:
50 kHz - 450 kHz
-- Fixed filter bandwidths for AM,AMS,
NFM: 4, 6, 8, 10, 20 kHz
-- Adjustable filter bandwidths for
AM,AMS, NFM: 2 - 25 kHz
-- Fixed filter bandwidths for LSB, USB,
DSB: 1.8 - 2.0 - 2.4 - 2.7 - 3.3 kHz
-- Adjustable filter bandwidths for LSB,
USB, DSB: 1 - 5kHz
-- Fixed filter bandwidths for CW: 0.25
- 0.3 - 0.5 - 1.0 - 1.5 kHz
-- Adjustable filter bandwidths for CW:
0.1 - 2 kHz
-- Display graphics scalable: Baseband -
IF1 - IF2 (MPX) - Waterfall - Audio -
RDS - S-Meter
-- Additional functions: AGC, noise
reduction, squelch, notch filter, 5 band
equalizer with presets.
-- Fixed step sizes: Off, 100Hz, 1KHz,
5KHz, 6.25KHz, 9KHz, 10KHz, 12.5KHz,
25KHz & User (freely adjustable).
-- Alphanumeric frequency memory: 125
-- Tuning wheel with push function
-- Antenna connector: SMA
-- Built-in 2W speaker & headphone
output in stereo
-- Screen size: 4"
-- Touch display
-- Screen resolution: 800×480 pixels
-- Computer mouse connection via USB-C
-- Battery capacity: 5000mAh
-- Battery life according to
manufacturer: approx. 4h
-- PC connection interface: USB 2.0 type
C for updates & control via various SDR
programs
-- Aluminum housing powder coated
-- Dimensions: (L×H×D) 150 x 81 x 27 mm
-- Weight 0.4 kg
Scope of delivery:
-- Dreamkit V2D
-- Touch input pen
-- USB C charging/PC cable
-- SMA extension cable
-- Instruction manual in Russian
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Block diagram of the
Arinst V2D
The
V2D is a tuner based SDR. It works with the powerful digital tuner
chip "R820T2". This chip is used in many black box SDR's. To my
knowledge, the V2D is the first portable SDR receiver to use this
chip. Actually the chip R820T2 was designed for the frequency range
40MHz - 1000MHz. But by a special circuit the frequency range can be
extended significantly.
Roughly speaking: By upconverting and downconverting the large
frequency range 100Khz - 2800MHz is generated.
![](V2D-Block.jpg)
A look under the hood
If you loosen the eight small screws on the side of the case, you
are granted a view into the interior of the device. Actually, no big
surprise, the V2D is neatly built. The display is attached to the
motherboard with two screws. If you remove these two screws, the
display can be removed very easily. In doing so, I made a positive
observation. The display is a 4" IPS LCD module, which can be bought
in many online stores, should this ever break, it is cheap to get.
The battery is located under the display. For the top view, I
removed the covers of both shielding boxes.
Functions of the V2D
The V2D has a large number of functions that need to be mastered and
also understood. The pictures below show most of them. If you press
the on/off button twice in succession or pull up the main screen
with the stylus, the menu with the settings appears. The currently
opened page is highlighted in blue.
Image origin: Arinst
On
the "Band" page, the receive frequency, operating mode,
bandwidth, NB, antenna impedance and tuning steps are set by
tapping the frequency display. |
Under "RF path control" from the Band page, the simple
(Basic) gain control can be called up. |
![](Arinst_V2D%20(5).jpg) |
![](Arinst_V2D%20(23).jpg) |
Under
"RF path control" from the Band page, you can access the
advanced gain control. |
On the
"Display" page, the width of the baseband and the width of
the IF1 spectrum are entered. The spectrum settings (Chart
Settings) are also located there. |
![](Arinst_V2D%20(17).jpg) |
![](Arinst_V2D%20(18).jpg) |
Under
Display at "Chart Settings" the spectrum and waterfall
settings of Baseband, IF1, IF2/MPX and Audio can be made.
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The
Device page houses the settings for display brightness,
display off time, power on mute, center tuning mode, change
of tuning knob direction, language switching, dark/light
theme, mouse port activation, switching to PC mode and
display of firmware, serial number, etc. |
![](Arinst_V2D%20(27).jpg) |
![](Arinst_V2D%20(21).jpg) |
On
the "Sound" page the NR, AGC, Notch Filter, Squelch and the
Equalizer are operated with presets. |
The setting
options of the Noise Reduction. (NR) |
![](Arinst_V2D%20(20).jpg) |
![](Arinst_V2D%20(25).jpg) |
The notch filters are freely
configurable. |
An important
filter is the noise blanker. |
![](Arinst_V2D%20(26).jpg) |
![](Arinst_V2D%20(24).jpg) |
The
"Presets" page houses the 125 (5x25) alphanumeric memories.
All parameters are stored. |
Main
display menu. Here you can compose the main display. The
display is scalable. |
![](Arinst_V2D%20(22).jpg) |
![](Arinst_V2D%20(1).jpg) |
The operation of the Arinst V2D
At the time of testing, there was no user manual for the V2D.
Therefore, I have listed a few basic functions and procedures here.
-- Most settings are made via the touch display. To do this, use the
included touch stylus.
If you tap and hold the stylus on the three small dots at the
bottom of the display and pull it up a bit, the mode menu appears.
Here
the operating mode, bandwidth, AGC, NR, NF (notch filter) and
for WFM the RDS decoding are displayed. For the main menu the three
small
points are pulled up further. Pressing the on/off key once
also opens the operating mode menu. Pressing it a second time opens
the main menu.
![](Arinst_V2D-small-menu.jpg)
-- On the right
side of the V2D there is a rotary knob with a push function. If
you press the rotary knob, a small menu appears on the right
edge of the screen.
The following settings can be made via this:
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-- Attenuator (Att)
-- amplification (Gain)
-- Tuning steps (Step)
-- Frequency (Freq)
-- Bandwidth (BW)
-- Squelch (Squelch)
-- Volume (Vol) |
|
![](Arinst_V2D-(28).jpg) |
--
To quickly go to direct frequency entry, press and hold the
frequency display for one second.
-- If you want to set the squelch level, press/hold the S-meter and
move the red line to the appropriate position below the noise
threshold. Squelch
off: Press/hold on the S-meter.
-- The same (press/hold) applies to most other settings such as AGC,
NR, etc.
-- On the main display between the spectra there is a small square
with a gray background. Pressing/holding this will take you to the
main display menu.
Here the arrangement and the function of the different
spectra can be defined. Moving the square also scales the display.
-- If you press the on/off button twice in quick succession on the
left side of the device, the display is switched off. Pressing it
once switches it on again.
The V2D also offers a feature that no other portable receiver
offers! The operation with a computer mouse. The mouse is connected
to the USB-C socket. If you don't have a mouse with a USB-C
connector, you should get an adapter.
Wired mouse work without problems. But wireless mouse with a 2.4Ghz
USB dongle also work! However, not every wireless mouse works. Until
now, only a Russian product that the manufacturer sent me for
testing purposes worked. The wireless mouse "OKLICK 525MW". If you
are lucky, you can find these OKLICK mouse at AliExpress. The best
will be, one works with a wired mouse. All settings as well as
frequency tuning can be done with the mouse. Pressing the mouse
wheel opens the small menu as seen above.
But normally the V2D is operated with the combination of touch input
pen and rotary knob.
![](Arinst_V2D-(30).jpg)
Firmware
Update
To add new features and to correct software bugs, the firmware
of the V2D can be easily updated. For this purpose, Arinst offers
the free software "Arinst Virtual Lab", which can be used to perform
the updates. After installing and starting the software, the V2D is
detected, its data is read and compared with the database at Arinst.
It is automatically detected whether the firmware on the V2D is
outdated. If this is the case, the update procedure starts.
Afterwards the device is restarted automatically. The update takes
less than two minutes.
![](Firmware.jpg)
Basic Experiences & Findings
Because the V2D has an elaborate
gain control, I first had to figure out how to deal with it.
There is a "Basic & Advanced" setting option. The "Basic" mode
offers only the attenuator setting and a simple 15 step low
noise amplifier setting. The "Advanced" mode offers the
additional setting option for the mixer.
After some tests in different frequency ranges it was clear that
the "Basic" mode was sufficient to be able to go on reception at
the existing stationary antennas. The V2D has a manual as well
as an automatic gain control. The automatic control (AGC) in the
"RF path control" section was not used because of the too high
gain on long, medium and short wave because it brings too much
level. The receiver then noises too much, quickly reaches its
limits and produces intermodulations.
Five configurable notch filters are available to suppress
whistling tones. The user must estimate the pitch himself and
enter the value in Hertz (Hz). There is no visual representation
of the notch filters on the spectrum. This is cumbersome and
takes time to adjust. Here an auto notch would be the better
variant. Often the annoying whistling tone was gone while still
searching for the right setting.
The noise reduction (NR) offers five sliders. It works decently
after careful adjustment. Reducing it to a single slider would
simplify the adjustment procedure considerably.
The noise blanker works quite well and can largely suppress
grazing fence impulses. With three controls, it can be adjusted
relatively quickly.
The 125 memory locations are very useful. In addition to the
frequency, operating mode and bandwidth, all settings that the
receiver currently has, are stored. This means that before
saving a frequency, you scale the spectrum/waterfall, set the
mode, bandwidth, tuning steps, gain, AGC, etc. as you like.
Everything is then stored in the memory and can be labeled
alphanumerically. If you recall the memory, everything is
restored as it was stored. Unfortunately, it was not possible to
save the memory contents on the PC at the time of testing,
should they ever be lost due to a firmware update.
The V2D has some audible interference on long, medium and short
wave. These interferences come mainly from the display or its
control.
When a weakly incident station sits between strong stations, it
is often masked with a noise bell. This indicates "reciprocal
mixing". The cause is the sideband noise of the receiver
oscillator. The sideband noise of the receiver oscillator mixes
with the strong signals. This effect often occurs on medium and
short wave.
The V2D in receive mode at stationary antennas
After several weeks of familiarization and some bug feedback to
the manufacturer Arinst, a serious test could be performed.
Because I had no suitable comparison receiver in the same class
at hand, I took the premium SDR Elad FDM-S3, because it has a
similarly large frequency range. Admittedly, a tough competition
for the V2D.
The hardware and specs of the V2D leave a largely good
impression. Now it will turn out how it will behave on powerful
antennas. In the test phase, the following antennas were in use:
- Reuter RLA4E/Fenu cross loop
- Datong AD370 active dipole horizontal
- NTi Megadipol MD300DX Vertical
- ARA 2000 clone from Heinz Stampfl for the range up to 2GHz
Below are audio comparisons between the Arinst V2D and the Elad
S3.
Second 0 - 10: Arinst V2D
Second 10 - 20: Elad S3
One exception: When comparing Italy
Cable Timesignal:
Second 0 - 34: Arinst V2D
second 34 - 68: Elad S3
To hear the subtleties I recommend to use a good headphone.
Long wave
We start at 171KHz. Here Medi-1 from Morocco is a good choice.
On 171KHz the station comes in very strong at the NTi MegaDipol
MD300 in the evening hours. The MegaDipol brings the V2D to its
limits. The gain has to be adjusted back a bit. In AM
synchronous (AMS) mode, the audio is free of the typical AM
crackle. On the Elad S3, the station comes in clearer and
with a little less noise. With BBC-4 on 198KHz the case is the
same.
Medi 1-171khz-V2D-S3-SAM-8khz |
BBC 4-198khz-V2D-S3-SAM-8khz |
Medium wave
In AM mode, the typical fast fading of the station can often
be heard. If you switch to AMS and set the audio AGC correctly, the
fading and crackling is almost gone. The clarity of the signal
delivered by the V2D is practically as good as that of the Elad S3.
With the quasi-stepless bandwidth adjustment, one always has the
appropriate bandwidth available. With increasing signal strength in
the evening hours, a special effect becomes noticeable. If you hear
a weak station between two strong stations, the weak station is
covered with noise. This is "reciprocal mixing". This effect can be
mitigated somewhat by turning down the gain. If there are no strong
stations near the receive frequency, the V2D behaves perfectly. The
bandwidth filters are steep enough to listen with 6-8KHz bandwidth
in the evening hours. The built-in equalizer with its presets can be
manually adjusted to suit listening habits. Especially with strong
stations like Radio Romania on 1152KHz with 20KHz bandwidth, it
invites you to linger there. The sonority that the V2D delivers here
is already great. On a good active speaker or headphones well
understood. The Datong AD370 delivered the best results here.
RNE Radio Nacional-738khz-V2D-S3-SAM-8khz |
Radio
Romania-1152khz-V2D-S3-SAM-20khz |
Lyca Radio-1458khz-V2D-S3-SAM-10khz |
Above medium wave
In this
frequency range, Dutch, Greek and Serbian radio pirates can be
received very often in the evening and night hours. These stations
usually come with unstable transmission frequency and have
suboptimal modulation. The V2D masters the prevailing reception
situations without major problems. With AMS one or the other station
can be made more audible. A bit further up, coastal radio stations
send their weather messages in USB. These could also be recorded
well. In this area the V2D got along best with the Datong AD370. It
has a moderate receive level and less noise because it is
horizontally oriented. So far, no large signal interference could be
detected.
Dutch Pirat-1620khz-V2D-S3-SAM-6khz |
Greek Pirat-1700khz-V2D-S3-SAM-6khz |
Lampedusa Radio-1876khz-V2D-S3-USB-2.7khz |
Shortwave
In the 80m band we meet radio amateurs. The V2D brings in
the sideband operation consistently very good results. Even with air
weather station Shannon Volmet on 3413KHz in USB, hardly any
differences to the S3 are audible. The audio reproduction, the
flexible bandwidth selection and the frequency accuracy, leave
nothing to be desired here. The difference to the Elad S3 which is
frequency calibrated via GPS is hardly noticeable. Arriving on
shortwave, we linger a bit in the 60m tropical band. Radio Rebelde
on 5025Khz is very good to receive around 2am. Only that the signal
in the lower sideband is disturbed by the well known RTTY signal.
Switched to USB and with 4KHz bandwidth, the station can be enjoyed
quite pleasantly on the V2D. On the Elad S3, the station is
equally good to record. Here you can see how important and useful
the manual gain control is. If I had left this situation to the
automatic gain control, the station would have been completely
noisy and there would be intermodulation products. A little later on
the same frequency and in AM sync, the V2D brings the station flawlessly. The synchronous demodulator is very stable and never
lost sync at any time. It also has a wide capture range. A few
kilohertz further down at 4885KHz, Radio Clube do Para from Brazil
slowly makes itself heard. Here hardcore DX reception is the order
of the day. On the Elad S3 the station is just at the turf. A few
Portuguese words are already to be understood. In this difficult
situation the V2D has to pass. The station can be heard but not
understood. A bit above the 41m band Voice of Korea is broadcasting.
The station comes well with the V2D. Unfortunately the station is a
bit noisy compared to the S3. In the vicinity of strong signals you
often have to reduce the gain so that the V2D does not overload. A
rare guest on the frequency 8879KHZ is Mumbai Radio, an airband
radio station from India. No differences to the S3 can be heard. On
exactly 10MHz, among others, Italy Cable broadcasts the time signal.
Because of the beautiful classical music, always nice to linger.
Large differences are to be noticed also here none. At Radio France
a small surprise. In this comparison, the V2D noise a trace less
than the S3. Then further into the 17m amateur radio band. In this
comparison, the reproduction quality is again equal. And already the
end of the classic shortwave is reached. The beacon DK0TEN on
28257KHz is always good to test the selectivity of the filters. Here
the V2D can't quite keep up. The steepness of the filters does not
come up to that of the S3. But this is not a big surprise. The
digital bandwidth filters of the V2D have only 500taps. Those of the
S3 at least 1500taps. So significantly steeper-edged or sharper. The
sharper the bandwidth filters are, the higher the processor load.
Reciprocal mixing" was also noticeable on shortwave as soon as
strong signal levels were near the receive frequency.
Shannon
Volmet-3413khz-V2D-S3-USB-2.7khz |
Amateurfunk-3785khz-V2D-S3-LSB-2.7khz |
Radio
Rebelde-5025khz-V2D-S3-USB-4khz |
Voice of Korea-7570khz-V2D-S3-SAM-8khz |
Mumbai Aero-8879khz-V2D-S3-USB-2.7khz |
Italy Cable Timesignal-10000khz-V2D-S3-USB-2.7khz |
Radio_France_Int.-15300khz-V2D-S3-SAM-8khz |
Amateurfunk-18161khz-V2D-S3-USB-2.7khz |
Amateurfunk Bake-28257khz-V2D-S3-CW-0.1khz |
The upper frequency ranges
The upper frequency range of the V2D goes up to 2800MHz.
Therefore, this range was only "tested", because it would go far
beyond the scope of a test report.
In the FM broadcast band, the V2D brings good to very good reception
performance. It is also Dx-suitable by the selection of the
bandwidth filters. Unfortunately, RDS doesn't work that well. The
decoding works well with strong incoming stations, as soon as the
signal strength decreases, it doesn't work so well anymore. The
audio playback via the built-in speaker is more for when you don't
have an active speaker or headphones at hand. It doesn't sound
convincing, which of course also has to do with the V2D's small case
size. Overloads I could not determine during the operation at the
active antenna fortunately none. In the vicinity of FM stations ,
i.e. in urban areas, the situation might look different. In the
civil aviation band, the V2D surprised with good reception. Here,
the gain had to be raised to have enough level. The same in the
250MHz range. In this range transmit Satcom military satellites,
which are often used by Brazilian and Russian radio pirates for
their private purposes. The V2D received surprisingly well in this
range. I was able to follow some conversations without understanding
a word of them. To be able to test the frequencies above, there was
partly a lack of usable signals and partly a lack of special
equipment.
The Arinst V2D controlled via PC
Thanks to the driver that Arinst provides for free, it is
possible to control the V2D via a Windows computer. Unfortunately, I
found that only HDSDR worked properly with the V2D. The SDRUnoEXTIO
version 1.22 also worked, but crashed often for reasons unknown to
me. Probably because the program is outdated and no longer 100%
compatible with Windows 10. SDRSharper, a clone of SDR#, is quite
nice, but also had its problems and froze now and then.
The Arinst V2D in outdoor use
The V2D is a portable receiver because of the built-in
battery. So I started to hunt for waves outside the domestic fog.
Equipped with the V2D, telescopic antenna and earphones I went out
into the open. The used telescopic antenna Diamond SRH789 is from
the length, perfectly designed for the V2D. To use the full receiver
sensitivity, the antenna input must be switched to "HI-Z" (high
impedance) in the settings of the V2D.
The V2D is sensitive enough to receive BBC4 on 198KHz at the
telescopic antenna during the day. On the medium wave around 15:00
stations were also receivable. Among them RAI on 900KHz and Radio
Gold on 1548KHz. Of course, you have to experiment a bit with the
gain control to get the best results. One thing I have noticed after
a short time: The automatic gain is set much too high, even for
outdoor use on the telescopic antenna. As a result, the receiver
noises much too much. With the manual gain setting I drove much
better. This optimized the reception wonderfully. There are a total
of 15 levels to choose from. One of them is the automatic. The
reception on shortwave was even better because of the stronger
signals. Just listening to strong incoming stations is really fun
with the V2D. Especially when you look at the wonderful, scalable
display. The reception of SSB stations, whether amateur or utility,
was excellent. The V2D sits very accurately on the frequency. Even
ECSS reception, listening to AM broadcast stations in SSB, was no
problem at all. There were no differences in audio when switching
sidebands.
After lingering on shortwave for a while and under a critical
tester's eye, I noticed that something was not quite clean. In
almost regular intervals were partly strong interferences to hear
and on the spectrum/waterfall to see. Unfortunately, the V2D does
not differ in this matter from other portable receivers with large
display with spectrum display. The interference found is generated
by the display! Now I also realized why you can turn off the display
by pressing the on/off button twice. To get rid of the
interferences. Means, if one wants to receive interference-free, the
display must be switched off. That clouded the joy.
Back at home, I unscrewed the device to see if I could somehow
dampen the interference. At first glance it seemed hopeless. But at
second glance, I noticed that the edges of the case were painted
over. The places, where the tinned side parts come on it. Because of
the overpainted edges, there could not be good RF shielding. So I
removed the paint from the edges and screwed the unit together.
A second test showed that the interference was about 10dB less. They
were still audible, but significantly less. Unfortunately, my little
intervention was not a cure-all. There were areas where the
interference was still equally strong.
Conclusion:
The Arinst V2D is almost a "dream kit." It offers amazingly good
reception on long, medium and short wave without immediately
overload. And that at domestic active antennas. When working with
the manual gain control, one largely saves intermodulation products
and noise. The function variety is enormous and qualitatively on a
high level. At that point you notice how Arinst has made an effort.
Above shortwave, the V2D can also convince. What it lacks here is a
search function (scanner).
The case is robust and of good quality. But unfortunately there is
criticism here. The housing shells were painted in places that
should not be painted! The painted flanks of the housing worsen the
shielding effect significantly, which is noticeable with strong
interference in reception, one operates the V2D with telescopic
antenna. Especially in the FM range, the interference is very
strong. Not only that. In the development of the V2D was much too
little attention to decouple the display to prevent interference
radiation in the receiving branch. The approx. 4h battery life was
unfortunately never reached. After just under 3 hours of operation
was the end.
Otherwise, the V2D is great fun. Especially with a external antenna.
Arinst proved to be a very committed manufacturer when it came to
correcting bugs in the software and implementing suggestions.
postet:
22.01.2023
![Receivers](button275.jpg)
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