TELE-audiovision - Weltweit größte Digital TV Fachzeitschrift - page 56

TELE-audiovision International — The World‘s Leading Digital TV Industry Publication
— 09-10/2014
Ku band LNBs
Excellent workmanship give excellent
reception results
Good For Strong
and Weak Satellites
We have already pre-
sented one LNB of Maxing
Electronic Technology – the
MB04 universal LNB for Ku
Band with an integrated DiS-
EqC switch (see TELE-au-
diovision 07-08/2014). This
time we picked some other
LNBs of their huge collection
of models, namely the more
commonly used versions of
Single, Twin and Quad LNBs
for Ku Band. Maxing gave
them these model names:
MX-16, MX-KT22C and MX-
KQ24C respectively.
The LNBs we put to our
test bench this time looked
from the outset typical for
Ku Band LNBs. They were
finished off very well. The
only small drawback we no-
ticed was that their labels
were made of paper. So,
you can not expect them to
survive long when installed
outside on a dish. How-
ever, do you really care?
Once installed, you usually
do not pay any more atten-
tion to the LNB on your dish.
Even if the label is eventu-
ally peeled off by rain and
wind this will not trigger any
problem or esthetic discom-
fort. That’s why we do not
should know that it was a
low noise (NF=0.2 dB) con-
temporary LNB of very good
quality. We decided to use
the LNB poiting to the AS-
TRA satellite on 19.2 East.
Although this satellite was
very strong in our location,
it did not necessarily mean
that the test was easier to
In such environment
(Toroidal dish and strong sig-
nals) you may expect quite
some interference from
neighboring satellites so ad-
ditional to the low noise fig-
ure the LNB under test must
also offer a low phase noise,
high cross polarization isola-
regard this as a serious im-
What really counts is the
performance. We decided
to use our Toroidal multi-
feed dish with 8 LNBs. For
the purpose of this test we
replaced one of its LNBs
with one by one the Max-
ing LNBs. The original LNB
served as the reference to
which the Maxing MX LNBs
were to be compared to. You
tion and high resistance to
intermodulation. The most
practical way to evaluate all
those parameters at once
is to compare the LNB un-
der test to another one of a
different brand. And that’s
what we did.
As usually, we compared
the LNB power output which
is directly related to signal
strength and Modulation
Error Ratio (MER) which in
turn is related to the signal
quality. The first two graphs
present the signal strength.
Evidently, the MX-16 was
weaker than our reference,
the MX-KT22C was visibly
stronger and the MX-KQ24C
was more or less equal.
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