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11-12/2014

TELE-audiovision.com/14/11/m

axing

52

TELE-audiovision International — The World‘s Leading Digital TV Industry Publication

— 1 -12/2014

TELE-audiovision.com

TEST REPORT

One Cable LNB

MAXING MX-OCS12

Perfect for using with existing tv cabling

What Is a One Cable LNB?

The universal LNB for Ku-

Band has become something

so standard that many of us

think that nothing else is of-

fered on the market. That

is not true. There are oth-

er products available. And

one of such non-standard

LNB for Ku-Band is the MX-

OCS12 of Maxing. The man-

ufacturer calls it “one cable

LNB” and this needs some

explanation.

The MX-OCS12 converts

two specific sub bands of the

lower part of the Ku-Band

to the L-Band. These sub

bands are: 10.7~11.2 GHz

at vertical polarization and

11.45~11.7 GHz at horizon-

tal polarization. Because its

local oscillator works at the

typical frequency of 9.75

GHz, the two sub bands are

shifted into the following

frequency ranges in L-Band:

0.95~1.45 GHz and 1.7~1.95

GHz. Now, the trick is that

you can connect more than

one satellite receiver to the

output: if only one of the

receivers supplies the MX-

OCS12 LNB with d.c. volt-

age (in the range of 11.5~19

volts) all the other receiv-

ers in the chain may have

their LNB power switched

off. Now the question is:how

many receivers can then

be connected to that one

LNB? Well, this depends on

the sockets you will use.

The sockets have splitters

that may differ in insertion

and tap losses. With typical

sockets, you should be able

to connect 8~10 receivers to

the output of the MX-OCS12

LNB and all of them wil be

able to tune into the above

mentioned two sub bands.

From the outset the MX-

that the MX-OCS12 LNB per-

formed very well in its ver-

tical sub band (10.7~11.2

GHz). It generated stronger

signals than the reference

LNB without compromis-

ing signal quality. MER was

practically identical with the

reference LNB. Moreover,

it was able to work even at

11.279 GHz so the vertical

sub band was slightly wider

than promised.

Output signal for the hori-

zontal sub band was a little

bit weaker than our refer-

ence. Also signal quality was

somewhat poorer. MER was

by 0.5~1.5 dB lower than

our reference. However,

MER=12 dB still guarantees

very solid reception even in

terrible weather conditions.

So, if the MX-OCS12 LNB is

used for a similarly strong

satellite as HOTBIRD then its

slightly weaker performance

in horizontal sub band will be

unnoticeable.

The MX-OCS12 LNB by

Maxing is a unique solution

to some special situations,

mainly when only the tran-

sponders on the two sub

bands, which the MX-OCS12

LNB supports, need to be

received. In such a case

the MX-OCS12 LNB allows

for a very simple chain in-

stallation, as normally used

in regular terrestrial tv dis-

OCS12 LNB looks as a typical

product for Ku-Band. Quality

of workmanship is excellent

but as we have noted before,

Maxing uses lables printed

on paper. Whilst this would

not concern us much with

any regular LNB in this case

with such a special LNB it

might be good to be able to

read the specifications also

after the LNB is exposed

to the outdoor world being

mounted on a dish.

Of course, the type of lable

on a LNB is not at all criti-

cal. What really counts is the

product performance. For

our TELE-audiovision test

we selected the HOTBIRD on

13° East as our source of sig-

nal and a modern universal

LNB as our reference LNB.

Our measurements revealed