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The World’s Largest Digital TV Trade Magazine
The World’s Largest Digital TV Trade Magazine
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Transponder Standard & SR<br />
10762 HL 27500<br />
10845 HL 27500<br />
10928 HL 30000<br />
10972 VL 27500<br />
11010 VL 27500<br />
11045 HL 10555<br />
11054 HL 2894<br />
11131 VL 14815<br />
11177 VL 27500<br />
11220 HL 30000<br />
11231 VL 30000<br />
11283 VL 27500<br />
11324 VL 30000<br />
11345 HL 27500<br />
11366 VL 30000<br />
11386 HL 30000<br />
11470 HL 30000<br />
11470 VL 29950<br />
11512 HL 30000<br />
11553 HL 30000<br />
11595 HL 30000<br />
11678 HL 30000<br />
12508 VH 2532<br />
12593 VH 2500<br />
12596 VH 2848<br />
12600 VH 2500<br />
12605 HH 27500<br />
12633 VH 4883<br />
12656 VH 4883<br />
12676 HH 2800<br />
12736 VH 3703<br />
covers to protect the cableto-LNB<br />
connection against<br />
rainand moisture. The bottom<br />
part of the quad version<br />
is protractile to ensure a similar<br />
level of rain protection for<br />
all four outputs. Finally, there<br />
are small scales on the top<br />
surface of the LNBs what help<br />
the installer in setting up the<br />
proper LNB tilt.<br />
Before starting the measurements<br />
we had to choose<br />
to which satellite turn our 85<br />
cm offset dish. We thought<br />
we make it really hard for<br />
these LNBs to see what happens<br />
when we go to the limit.<br />
For our test we selected the<br />
EUTELSAT16A on 16° East.<br />
80 <strong>TELE</strong>-<strong>audiovision</strong> International — The World‘s Largest Digital TV Trade Magazine — 07-08/2013 — www.<strong>TELE</strong>-<strong>audiovision</strong>.com<br />
Why? Because this satellite<br />
has very strong neighbors:<br />
ASTRA on 19.2° East and<br />
HOTBIRD on 13° East. Moreover,<br />
EUTELSAT16A has not<br />
only high symbol rate transponders<br />
but also weaker<br />
transponders with low symbol<br />
rates. The lowest SR was<br />
2500 ks/sec. The table lists<br />
all the transponders we used<br />
for testing the single and<br />
quad LNBs.<br />
As a reference LNB we<br />
decided for a very good low<br />
noise LNB of another manufacturer.<br />
Only the best products<br />
on the market can match<br />
its performance and now we<br />
were curious if HUMAX really<br />
was able to get close to it.<br />
We started our test with<br />
the single and quad LNBs of<br />
HUMAX: model numbers LNB<br />
113 and LNB 142. We came<br />
to our first surprise: all HU-<br />
MAX LNBs beat our reference<br />
in signal str<strong>eng</strong>th. The quad<br />
version model LNB 142 even<br />
stood out by l<strong>eng</strong>th: it performed<br />
even 5 dB better than<br />
our reference unit! That‘s<br />
something important to consider,<br />
especially when you<br />
use long cables or antenna<br />
switches that attenuate the<br />
signal.<br />
We proceeded to measure<br />
signal quality. As usually, for<br />
this we used the Modulation<br />
Error Ratio (MER) parameter<br />
as our metrics.<br />
The results here were not<br />
so obvious. Using sports terminology,<br />
we would say that<br />
the HUMAX LNBs tied with<br />
our reference. For some transponders<br />
our reference LNB<br />
was slightly better, for some<br />
other transponders models<br />
LNB 113 or LNB 142 were<br />
the winners. One sample of<br />
the LNB 142 (marked brown<br />
in our table) performed not<br />
so well for 12596VH and<br />
12600VH low symbol rate<br />
transponders (2848 and<br />
2500 ks/sec respectively).<br />
However, another sample of<br />
the same LNB 142 model was<br />
better than our reference for
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