214
TELE-audiovision International — The World‘s Largest Digital TV Trade Magazine
03-04/2013
TELE-audiovision HISTORY
TELE-audiovision in 2003
Years Ago
36
TELE-satellite International— TheWorld‘s LargestSatelliteMagazine —
T
he Indian city of Bangalore is
an ideal location for a satellite
monitoring station. At 943meters
(3113 feet) above sea level, the anten-
nas have a clear view from HOTBIRD
at 13° East all the way to AGILA-2 at
146° East. This station is operated by
Vatsa, an experienced satellite com-
munications specialist. Every satellite
in range ismonitored 24 hours a day.
These satellites include AGILA-2, JCSAT-
3, APSTAR-1, APSTAR-1A, ASIASAT-2,
ASIASAT-3S, PALAPA-C2, ST-1, INSAT-
2E, EXPRESS-6A, THAICOM-3, INSAT-3C,
PAS-7/10, INTELSAT 704, 906, 904, 902,
NSS703, INSAT-2DT, EUROPESTAR-1 and
ARABSAT. Any channel updates that are
found are immediately forwarded to Sat-
coDX’s headquarters in Budapest,Hungary.
Here this data is synchronized with data
from other regions and then uploaded to
the SatcoDX charts on a daily basis. These
updates are then sent to subscribers via
e-mail. Out-of-Footprint tests are much
more involved. Here we try to determine
what size dish is needed to receive sig-
nals not meant for that particular region.
A typical example would be the reception
of PALAPA C2 in C-band. A small side beam
of this satellite is pointed in the direction
of India but Bangalore lies just outside of
its standard footprint.While about 32 dBW
is available on the Bengali Gulf Coast, the
EIRP falls off dramatically just a little fur-
ther west. After several attempts, partial
success was achieved with a four-meter
dish. The analog channels (TVRI, MTV, TV-
5 etc.) were receivable as were the digital
transponders.But this only seemed towork
in the evening. Unfortunately, this is typi-
cal with out-of-footprint reception. Further
tests are needed. Another project is the
reception of HOTBIRD in southern India.
Positive results have been reported from
neighboring Pakistan using a three-meter
or larger dish. In Bangalore however you
would need to do even better than that.
There’s still plenty of room up there for
another antenna.With that inmind, his 4-
Out of Footprint
TSI India
Tracking Center
meter (13-foot) diameter dish, currently
his largest antenna that he uses for the
reception of linear and circularly polarized
C-band signals, can expect to have a new
neighbor in thenear future. For theKu-band
he uses a 2.65-meter (8.7-foot) solid prime
focus antenna. By using a C-band feedhorn
togetherwith a Ku-band LNB hewas able to
improve reception by about 15%.Why? At
the moment we’re not quite sure. He dis-
covered this arrangement simply by playing
around and experimenting. Perhaps after
some extended comparisonmeasurements
an explanation for this phenomenon could
be found. Naturally we would tell you all
about it with a report in TELE-satellite. For
regional Ku-band reception he uses a 1.2-
meter (4-foot) offset dish.
The receivers currently in use are an
Echostar LT-830 (with outstanding analog
reception qualities) and an Echostar
707FTA for digital reception. The anten-
nas are driven by a Eurostar AP-2000 dual
positioner. Additional receivers are being
planned. One problem is the high import
duties levied on new receivers.So the spe-
cial receivers that arewaiting atSatcoDX’s
headquarters must wait a little longer
before they can be placed into service in
Bangalore.
Vatsa andhis antennas
Bangalore, India
Indoor:with a lotof space formore
1...,204,205,206,207,208,209,210,211,212,213 215,216,217,218,219,220,221,222,223,224,...228