8dtek

TEST REPORT Satellite Signal Analyzer
该独家报道由技术专家所作

8dtek DSM
Desired
• includes features normally
only found in much higher
priced products
• shows constellation and
spectrum
• handles all DiSEqC variants
including motors
• thanks to a remote control
it can be used as satellite
receiver
• easy-to-read LED display
ideal for installers

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30 TELE-satellite — Global Digital TV Magazine — 08-09/201 — www.TELE-satellite.com
1 www.TELE-satellite.com — 08-09/201 —
1 TELE-satellite — Global Digital TV Magazine 31

TEST REPORT Satellite Signal Analyzer

For the Professionals
08-09/201
1
8d tek
A HDTV signa DSM Desired
l meter and rec
one with plenty eiv
of professiona er all in
l features

A HDTV signal analyzer
with 16:3 screen
In TELE-satellite 06- the antenna system while the set. Well, perhaps there that list of channels is cre-
07/2011 we presented the to the other one (the loop are situations in which you ated, out of which you then
DSM Gifted meter, a very through) you can connect would like to put the meter can choose from. Of course,
powerful satellite finder in a receiver. We intentionally on the ground or at a dis- its usability is limited and
an attractive design. But say “the antenna system” tance and operate it with a can not be compared to a
the manufacturer 8D Tech- and not just LNB because remote control. However, 8D regular satellite receiver but
nology didn’t stop there: the DSM Desired can control Technology offer you anoth- it is a nice addition.
they expanded their range not only DiSEqC switches, er solution for difficult op-
of meters with another very DiSEqC motors (1.2 and US- erating positions – you can You can fully control the
advanced meter and called ALS) but also any combina- use an included protective DSM Desired either with
it DSM Desired. It sports tion of switches and motors. meter bag and wrap its strap the remote control or di-
a 16:9 LSD screen and has around your wrist. This inno- rectly - using the front panel
many additional numeric Hidden under the flaps on vative solution seemed more membrane keyboard. Menu
buttons. There is a second- both meter sides are: DC practical to us. button is used for entering
ary 2-digit LED display lo- power socket (mains power menu items and for leav-
cated in the top right corner, unit and car charger are in- On the other hand, the ing them. SPCM stands for
wich shows the quality of a cluded), combined A/V plus remote control unit may be Spectrum and is a shortcut
signal. This is quite useful RS-232 output, USB port for useful if you would like to taking you directly to signal
in direct sunshine when it is software upgrades and data use your DSM Desired as spectral view. The big round
hard to read the main liquid storage and an Ethernet port your satellite receiver. Yes, it SAT button is another short-
crystal display. that can be used to test your can show live channel video. cut – to Local Sat menu.
Internet connection. Rather To start viewing, all you have F1-F4 function buttons have
There are two F type con- unexpectedly, there is also to do is to scan a selected varying functions depending
nectors: to one you connect a remote control included in satellite or a transponder so where you are in the menu

1

1 2 3 7 8 9

4 5 6 10 11 12

13
system. Four LED’s located the meter if this is a simple
near the bottom indicate fixed antenna for one satel-
charging status, signal lock, lite or a multifeed system
and LNB voltage as well as with DiSEqC switches, DiS-
high/low band switching sig- EqC motors or a combination
nal (22 kHz). of them. This is done in the
DiSEqC menu item. Every
The Local Sat windows satellite is set independent-
shows you graphically what ly. So, some of them may be
satellites are located in configured as received with a
which position over horizon motorized dish and the oth-
at your location. Just over- ers as fixed feeds connected
14
write the default settings to given inputs of DiSEqC
(which in our case were for switches.
the manufacturer’s home-
town Shenzhen in China) When you are ready to
with your own location and start turning your dish, we
the pre-programmed list suggest using the first menu
of satellites, wich contains item: Sat Find. Here you can
the “birds” from all over the select the satellite, your LNB
world, will show you the sat- LOF’s, the transponder you
ellites visible at your loca- want to tune to and the meter
tion. displays the signal strength
and signal quality expressed
If you already know quite in percentage, Viterbi BER, 1. Main Menu
well what satellite you want and the satellite name it rec- 2. Sat Find window
to receive, you might be in- ognized analyzing received 3. DiSEqC settings
4. Local Sat window
terested in the Angle menu signal. If you prefer, you can 5. Angle calculation screen
item. In this screen, you switch to the constellation 6. Spectrum viewer
enter your coordinates, se- graph view – either directly 7. Setting spectrum viewer parameters
8. Measuring transponder parameters in
lect the satellite and DSM from the Sat Find window or spectrum view
Desired calculates all neces- from Main menu. 9. Constellation graph window
sary angles: azimuth, eleva- 10. Detailed signal measurement results
tion and LNB tilt. 8D Technology can really 11. LNB test
12. Systems settings
be proud of the number of 13 Internet Ping window
Now, you have to inform frequencies they offer in the 14. Watching channel video

1 www.TELE-satellite.com — 08-09/201 —
1 TELE-satellite — Global Digital TV Magazine 35

Sat Find menu item. Here measurement results. From you are still in the constella- to the previously tested DSM
is the impressive list of lo- here, press F2 and you can tion window, you can change Gifted (see TELE-satellite
cal oscillator frequencies go deeper into a window we transponder or store the re- 06-07/2011). You can set
(LOFs) you can select in DSM could name “detailed signal sults to a USB stick (F1 and frequency span and you can
Desired: 5150, 5750, 5950, quality”. Here you can see all F4 buttons respectively). lock to a marked transpond-
9750, 10000, 10050, 10450, relevant signal parameters er and measure its basic pa-
10600, 10700, 10750, in large font along with bar Spectrum analyzer has rameters. However, it is still
11250, 11300, 5150-5750, graphs. Alternatively, when more possibilities compared quite slow so do not count
5750-5150, Universal (9750-
10600) and SCR (9750-
10600).

The constellation menu
not only shows you the
constellation but addition-
ally displays S/N and C/N

1

on using it for fast signal de-
tecting when initially setting
up your dish.
System menu lets you
customize meter settings as
well as initiate firmware up-
grades. We did firmware and
transponder upgrades twice
and all of them were very
fast and easy. You can also
set here the Internet con-
nection you would like to test
using the meter’s Ethernet
port. If the connection is re-
alized via a DHCP router, you
should configure it accord-
ingly in the system menu.

When we started taking
actual measurements we re-
alized that the DSM Desired
has similar limitations as its
simpler brother. The quality
readings were changing not
with 1% step but with 6-7%.
So in the ascending order
the signal quality may take
only one the following val-
Another feature typical for
more advanced meters is
Expert Opinion
ues: 46%, 53%, 60%, 66%, an A/V output, but available Measures DVB-S, DVB-S2 and analog signals.
73%, 80%, 86%, 93% and in the DSM Desired. All the Support for DiSEqC 1.0/1.1 and SCR.
99%. 46% is already be- screenshots accompany- Suitable for turning motorized dishes (DiSEqC
1.2 and USALS).
low reception threshold, so ing this report were taken
practically we are left with from this output. If you use + Quality readings duplicated on an easy to read
LED display. Jacek Pawlowski
8 discreet values. The other the meter on the desk, you TELE-satellite
Big enough and well readable 16:9 LCD. Test Center
signal quality measures: S/N should connect it to a suit- Looped through signal output to connect a Poland

and C/N have equally fixed able screen with a CVBS receiver.
discreet values. For example video input. The graphics is
for Quality=93%, S/N is al- very nice indeed. No MER measurement
ways 14 dB and C/N 14.35. – Signal quality, S/N and C/N readings in only 8 steps
For Q=80, S/N=12 and C/ Along with its accessories No MPEG-4 decoder
N=12.35dB, for Q=73%, S/ DESM Desired is very prac-
N=11 and C/N=11.35dB. tical. Its battery has a high
Since the measurement re- capacity and the meter can
TECHNICAL
DATA
sults are only in fixed steps, be used to turn DiSEqC mo- Manufacturer 8D Technology Ltd., Hong Kong
you should treat them as in- torized dishes without a fear
Webpage www.8dtek.com
dications rather than precise that it will die in a minute or
Email 8dtek@8dtek.com
results. two. It can drive even more
Fax +852 3965 3222
complex DiSEqC switch/mo-
Model DSM Desired
As a result, DSM Desired tor antenna systems. So
has a measurement perfor- except for antenna align- Description Satellite meter for antenna alignment

mance similar to its brother ment, you may also use it for C/Ku Band Yes
DSM Gifted. But its full color checking signal distribution. Unicable Yes
display, possibility to watch DiSEqC 1.0 – 1.2 and USALS
MPEG-2 channel video and Although its precision and Quantities measured Signal level [%], signal quality [%], BER
audio and interesting menu accuracy does not match
Inputs L-Band (950-2150 MHz),
functions look like something that of high class profes- DVB-S/S2 and analog signal
taken from a much more ex- sional meters, DSM Desired Video Decoder MPEG-2
pensive and powerful meter, should perform quite sat-
Outputs L-Band (looped through), A/V (composite + mono)
like the showing of constel- isfactory in aligning fixed
Data ports USB, RS-232
lation and spectrum views, a dishes for strong European
PSU 100-240 V 50/60Hz
feature only found in much satellites like ASTRA 1 or
more expensive products. Dimensions 140 x 100 x 40 mm (ca. 5.5 x 4 x 1.5”)
HOTBIRD.

1

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