Svec

TEST REPORT VSAT Dish

SVEC 1.2 m VSAT Dish 12-01/201

internet via Satellite -
1
SVEC 1.2 m VSAT DiS
Per fectly made dish eas h
y to point to the
desired satellite

it's Easier Than You Think

Once you are accustomed
to the Internet, you can hardly
think of not having access to it for
a longer period. However, there are
still locations, even in most developed
countries where there is no telephone line
available. Are the GSM operators the only
possibility then? Not exactly - we can think of two-
way satellite connection instead. Receiving IP data via
satellite is not that different from receiving A/V transport
stream. Bits are bits and bytes are bytes.

54 TELE-satellite — Global Digital TV Magazine — 12-01/201 — www.TELE-satellite.com
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Available online starting from 3 December 2010

More on This Manufacturer
Read TELE-satellite’s Company Report:

SVEC
am.com Professional Dish Manufacturer, China www.svec.com.cn
heavy. BUC consumes about But do not forget that from
30 W of electric power and the professional perspective,
must be equipped with a big “very small aperture” means
and heavy heat sink. smaller than 3 meters.

Moreover, the dish must installation
guarantee the proper geom- The parcels containing the
etry and stability of alignment components of the SVEC
because if not, it will be trans- dish were big and heavy. No
mitting interfering signal to wonder, everything is made
the neighboring satellites. No of steel. After unpacking and
wonder that such dishes are examining the components,
bigger and more solid than we concluded with satisfac-
the ones satellite enthusiasts tion that the assembly should
are familiar with. Those dishes be quite easy. And indeed,
www.TELE-satellite.com/TELE-satellite-1003/eng/svec.pdf are often called VSAT dishes. it was. Even without any
VSAT stands for Very Small assembly instructions, it was
Aperture Terminal and means not difficult to figure out what
SKYWORTHa DOCSIS
Except for having a suitable dish. Such a dish a two-way satellite ground should be connected with
he.com modem, Manufacturer, China
Receiver an LNB, a BUC should be much stronger than
www.skyworthdigital.com station. This may sound what. Everything fitted very
(Block Up-Converter) and a the one dedicated for recep- rather funny as the dishes are well, except from one small
subscription from a service tion only. That’s because bigger than the regular 60 or detail. We could not figure
provider, you need to have the LNB/BUC unit is big and 90 cm reception antennas. out how to fit the two BUC/
LNB side supports. After a
Standard 1 m dish SVEC 1.2 dish
while, we realized that the
Channel Power 73.6 dBµV 74.2 dBµV
brackets attached to the dish
C/N 13.3 dB 13.5 dB edges that were supposed to
MER 12.4 dB 12.8 dB be connected with the LNB
Link Margin 5.2 dB 5.6 dB supports are mounted upside
CBER 9 x 10-5 5 x 10-5
down. When we re-assembled
■ Table 1. Comparison of SVEC dish with the regular dish used for the service in Poland.
EUROBiRD 3 on 33º E, 12522V, 27500, 5/6. them in the correct way, eve-

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rything was OK and no fur- screw with two fixing nuts. the spectrum view. We ran thing was wrong with the
ther problems popped up. We can assure you that this satellite identification func- uplink and they would inves-
adjustment is also very pre- tion and, to our surprise, it tigate the problem abroad.
Due to the size and weight cise and you can tip-toe the was EUROBIRD 3. Then we After half an hour or so, they
of the hardware, you need a elevation as well as the azi- checked the parameters of called back again saying that
helping hand in some opera- muth. the transponder and it so their modem had locked.
tions – for example when happened that our spectrum Quick check revealed that
mounting the reflector on the LNB/BUC holder with a view was exactly centered on our modem had locked too.
pole. Speaking of the pole, it feedhorn and waveguides the right transponder. Unbe- Finally, we had access to the
has a very practical three-leg accepts standard recep- lievable! The only thing left Internet via satellite.
base. Even if the surface is tion and transmission units. was fine-tuning of azimuth,
not quite flat and horizontal, It separates the polariza- elevation and tilt. Performance
you are able to adjust every tions - in our case vertical We checked what the down-
leg independently and ensure polarization was used for When everything starts load and upload speeds were
that the pole is perfectly the reception and horizontal much better than you and we got: 2849 kb/s and
upright. for transmitting the signal. expected, better be cautious. 160 kb/s. The figures were
It also allows you to adjust Murphy Law is waiting to hit in line with the connection
We loved the azimuth the tilt of a BUC/LNB set. We you even more severely. And specification we had from
adjustment mechanism. needed to set 10º tilt and it indeed, our DOCSIS modem our provider. A small delay
It is really a dream when was no problem. could not lock to the service. before the start of the down-
compared with the regular The receiving LED indicator load was noticeable but this
reception dishes. You set the After installing BUC and was blinking, the transmit- is normal in satellite commu-
antenna roughly in the proper LNB, we turned the antenna ting LED indicator was blink- nication. After all, the satel-
direction and then you rotate roughly in the direction of ing and we could not connect lite is 36000 km up there and
the lever what makes the EUROBIRD 3 on 33º E which to the Internet. After double some data buffering must
dish turn East or West. In this was the satellite our Inter- checking everything we also take place when error
way, you can adjust the azi- net provider was using for phoned the operator. After correction schemes are used.
muth with absolute precision. their service. After connect- a while they called back with
ing a satellite signal ana- the message they could not But how to asses the quality
Elevation adjustment is lyzer to the LNB output, we lock to the signal either. They of the connection? We decided
more classical – a long thick immediately saw a signal in said that evidently some- to compare the incoming

www.TELE-satellite.com — 12-01/201 —
1 TELE-satellite — Global Digital TV Magazine 57

the reference. For the read- the same ratio. That’s phys-
ers not familiar with the ics. We can say so because
term: the lower the CBER, both LNB and BUC use the
the fewer erroneous bits that same feedhorn located in the
need to be corrected by the same position with respect to
modem. the reflector.

Also the link margin Our test revealed that
increased from 5.2 dB to 5.6 SVEC 1.2 m antenna is very
dB and you should know that good (if not too good) for
5 dB is already considered as the casual Internet access in
very good. We can be sure Poland. In the other regions
that with the SVEC dish our of the world where the signal
Internet connection will be is not that strong, using 1.2 m
almost completely insensi- dish instead of 1 m can make
tive to whether conditions. a difference. Our measure-
signal when received with As you can see in the table, ments proved that the gain of
SVEC 1.2 m dish and when SVEC dish delivered stronger We had no possibility to the dish is big. It means that
received with the regular 1 m signal of better quality. It measure the transmitted its geometry leaves noth-
dish you get when you sub- is especially visible in the signal but the performance ing to be desired. The SVEC
scribe to this service at our Channel Bit Error Rate. It of the SVEC model must be 1.2m dish is a perfect choice
location in Poland. was almost twice as good as better than the reference in for using it with VSAT.

Expert Opinion
+
Very solid, excellent azimuth adjustment
mechanism, very good adjustable three-leg pole
base.

- Jacek Pawlowski
It might be too heavy for some applications. TELE-satellite
Test Center
Poland

TEChNiCAL
DATA
manufacturer Sichuan Video Electronic Co., Ltd.

Web page www.svec.com.cn
Email svec@china.com

Fax +86-028-87838898

model VS-1.2KU

Description VSAT Dish for Ku-Band

Dish Size 120 cm (49 Inch)

Frequency Range Receiving: 10.95 – 12.75 GHz
Transmitting: 13.75 – 14.50 GHz

mid Band Gain Receiving: 41.5 dBi
Transmitting: 43.1 dBi

VSWR Receiving: 1.5 : 1
Transmitting: 1.3 : 1

Cross Polarization -20 dB off axis, -30 dB on axis

Sidelobe Envelope 2° < 0 < 20° : 29 -25 log 0 dBi
20° < 0 < 26.3° : -3.5 dBi
26.3° < 0 < 48° : 32 -25 log 0 dBi
48° < 0 : -10° dBi on average

Noise Temperature <55K at 20° elevation

Dish type Prime Focus and Offset Feed

Waveguide Flange WR75

Reflector Material 2.0mm Aluminium Plate

Mount Type Elevation over Azimuth

mast Size 3.5 Inch outer diameter
Azimuth/Elevation Adjustment Azimuth: 0° - 360°
Elevation: 5° - 90°

Weight 27 kg (60 lb)

Wind Load Operational: 80 km/h (50 mph/h)
Maximum: 200 km/h /125 mp/h)

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