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SPAUN electronic GmbH & Co. KG, Germany
+49 (0)7731 - 8673-0
+49 (0)7731 - 8673-17
SUS 5581/33 NF
SCR Multiswitch compatible with EN50494
4 satellite (LNB Quattro or Quad)+ 1 terrestrial
Tap outputs
1 or 3 (switchable: 1x8 or 3x3)
Trunk outputs
Through loss
1~2.5 dB for IF and <4 dB for terrestrial signal
Terrestrial tap loss
13~15 dB
SAT input signal
65~90 dBµV
SAT tap output
90 dBµV for 1 x 8 output
82 dBµV for 3 x 3 outputs
LNB remote current
500 mA
Power consumption
< 7 W
Ambient temperature
-20~+50° C
Jacek Pawlowski
Test Center
TELE-satellite International — The World‘s Largest Digital TV Trade Magazine
— 12-01/2012
signal strength was at 90%
and signal quality at 80%.
Not bad, not bad at all, if
you take into account that
the signal was attenuated by
a long cable and the sockets.
However, in real life, you
do not always have the most
modern receivers well pre-
pared for the SCR system.
Therefore, we decided to
check how an old receiver
would perform. We took a 5
years old receiver with SCR
feature. At that time it was
quite a novelty. We were full
of doubts if it will be able to
lock to the signal when con-
nected to the last socket
but to our surprise, it had
no problem at all, neither at
the lowest frequency (1068
MHz) nor at the highest
(1980 MHz).
But what you should do
if your cable installation is
longer than that in our test
setup (about 55 meters)?
The solution is quite simple.
Use an inline satellite signal
amplifier. When we connect-
ed the SPAUN SVN 231 F am-
plifier, it boosted the signal
by 30 dB. Signal level meas-
ured at the last G10 socket
at 1980 MHz rose from 50.2
dBµV to 80.6 dBµV. With
such amplifier you can add
another 100 meters of co-
axial cable and have in total
over 150 meters! And mind
that with a single amplifier
you boost the signal for all
eight receivers!
When we switched the SUS
5581/33 NF to 3x3 mode, its
output signal is regulated to
about 80 dBµV. We checked
output no. 3 in the similar
setup. This output generates
the highest frequencies and
thus is most sensitive to ca-
ble losses. Total cable length
was about 45 meters and we
used G18, G14 and G10. Sig-
nal level measured at their
outputs was respectively:
52.7, 54.2 and 56.5 dBµV
and of course our receivers
had absolutely no problem in
locking to the signal.
But this was not the end
of our test. SPAUN claims
in their user guide that ”By
internal electronics of the
device, the use of special
protection sockets (with
shut-down on reception of
non-standard DiSEqC com-
mands to EN 50494) is not
necessary.” Such statement
is nothing but a challenge for
a dedicated tester.
So, apart from the EN
50494 compatible receiv-
ers, we connected a classi-
Very good workmanship of the SUS 5581/33
NF and the UNiSockets.
Simple installation and trouble free operation.
SCR switch cascadable not only with identi-
cal products but also with classical multi-
Possibility to power the switch via the terres-
trial trunkline.
Low insertion loss of the UNiSockets
Expert Opinion
cal receiver to the single ca-
ble system built with SPAUN
components and operated
it in such a way to make it
send various DiSEqC com-
mands (1.0, 1.1 and 1.2).
We were changing reception
system configuration in the
receiver menu and then zap-
ping channels.
And indeed, in line with
SPAUN’s promise, nothing
could disturb the operation
of UniSEqC compatible re-
ceivers. They continued to
deliver undistorted video
and audio. We know, how-
ever, that not every SCR
system offered on the mar-
ket has so advanced rout-
ers as SPAUN. So the SPAUN
UNiSEqC offers the addi-
tional advantage of being
foolproof against users con-
necting regular receivers or
badly configured receivers
- SPAUN’s system simply ig-
nores these commands and
keeps working perfectly.
The UNiSEqC system, once
configured, works reliably
without any maintenance.
After a power shortage, the
receivers boot and send
commands to the SCR multi-
switch to activate “their” fre-
quencies. Everything starts
to work again.
We are sure that this is
the simplest and cheapest
solution to make an existing
installation suitable for twin
tuner receivers with only one
cable entering every room.
The system is also attractive
for new installation as the
complexity of cabling is sig-
nificantly reduced. You can
easily combine classical mul-
tiswitches and the UNiSEqC
system. Several wiring ex-
amples are provided in the
user guide. The only precon-
dition is: you must use SCR
compatible receivers. Fortu-
nately, more and more new
receivers are equipped with
this feature.