Seite 74 - TELE-audiovision - Weltweit größte Digital TV Fachzeitschrift

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74 TELE-audiovision International — The World‘s Largest Digital TV Trade Magazine — 03-04/2013 — TELE-audiovision.com
2. KLA-110 initial web page
displayed right after ente-
ring 192.168.1.1 in the web
browser IP address field
3. After logging in, the
headend has the default
factory settings. By
pressing “Settings”, you
enter a page in which you
can configure either the
KLA-110 Launch Amplifier
or one of the KCC-110
Channel Converter
4. The default settings of a
KCC-110 Channel Con-
verter
world signal to the headend.
We first examined the sig-
nal coming from our anten-
na and decided that three
digital channels: 41, 45 and
46 will be the channels to
be processed. They were on
the following frequencies:
634 MHz, 666 MHz and 674
MHz respectively. We decid-
ed to move them all to new
frequencies. We chose the
output channels to be 50, 53
and 56. The following table
lists the basic parameters
of the input signals and the
corresponding output sig-
nals and the results of our
measurements. (Table 1.)
The combined gain of
the KCC-110 Channel Pro-
cessors and the KLA-110
Launch Amplifier gave more
than 50 dB boost to each
channel. Despite such a
great amplification, carrier-
to-noise (C/N) ratio did not
degrade but even improved.
The Modulation Error Ratio
(MER) decreased by a few
decibels but still the signal
had quite a good noise mar-
gin. You can see a meter
screenshot of the channel
56 measurement results.
We wanted to check if
the signal would be equal-
ly good if we program the
headend to use adjacent
output channels. We chose
50, 51 and 52. The signal
quality was practically the
same: MER = 24.0, 24.0 and
24.5 respectively. So noth-
ing prevents using adjacent
channels when program-
ming with the Antiference
headend. The quality of the
signals will not suffer.
It is important to note
here the consequences of
this excellent result. For
one, it shows the ultra-
steep cut-off double mode
SAW filters Antiference is
using. SAW stands for ‘Sur-
face Acoustic Wave’ and
means that SAW filters use
piezoelectric crystals or ce-
ramics instead of the classi-
cal inductors and capacitors
allocated dynamically each
time you want to access the
KLA-110 remotely, you must
first find out what address
it has at the very moment
(by using a program scan-
ning the network and tell-
ing you what devices occupy
what addresses). So, in pro-
fessional networks, you’d
rather prefer to manually
allocate the IP addresses
for all the client devices and
then you know for sure that
at, say, 192.168.1.25 there
is always your headend not
your printer or something. If
you set the network param-
eters manually, it is recom-
mended to write down the
new settings for future ref-
erence because the KLA-110
does not have any LCD to
show you what the current
settings are. Once the KLA-
110 is properly set up in the
network and you know its IP
address you can reprogram
it from anywhere else, as
long as you can log into the
network. This is a great fea-
ture of the Kingray headend
as it allows maintainance
from outside the actual in-
stallation point.
After we connected to
it with our laptop, every-
thing went very well. Login
worked with the default
user/password combination
provided in the manual (ad-
min/admin). All the screens
displayed in our web brows-
er looked exactly as in the
manual and every setting
took effect immediately af-
ter pressing the “Write” but-
ton on the web page. So, we
decided to connect a real