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| I. | Background |
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From
BMAC to MPEG-2 (via DMAC, D2MAC, PAL & SECAM) in just over a decade
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My involvement in Satellite Television reception started back in 1988 when I attended a TVRO training course for the installation and maintenance of business satellite installations using Scientific Atlanta BMAC receivers and 1,2m prime focus dishes for reception from the Intelsat bird at 27,5' W. There were very few DTH satellites around back then. SES had launched Astra 1A with it's 16 PAL channels and BSB were competing with a far superior D-MAC service from their two Marcopolo satellites at 31'W. Sadly this service was soon closed down when Sky bought it and everything was destined to join the ranks of Betamax video recorders and On Digital receivers. Fortunately, some D-MAC receivers for the BSB service were easily converted to D2MAC by changing just one EPROM. Val and I were soon using such a system comprising of a Ferguson SRB1 receiver and a couple of Squarials, (one each for RHC and LHC polarisation) enabling us to receive top quality DTH services from the French TDF and German TV-SAT birds at 19'West. This became the first of many different installations. |
| II. | Installations |
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Aquisition
of a ghastly 16 channel Amstrad SRX 200 receiver (left) designed for
the Astra service soon led us to upgrade to a Pace PRD 900 which we
set up for reception of Astra at 19'E, Eutelsat 13'E and Telecom 2B
at 5'W with a Secam to Pal trancoder for the French channels (below
left and right).
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Amstrad
SRX 200
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Secam-PAL transcoder and Pace PRD900 on top of the Ferguson SRB1 DMAC receiver. |
Shortly
after I got all this system working, we moved house and the whole lot
had to come down again!
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| Squarial, 80 and 60 cm dishes. |
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An experiment using a cheap radio aerial rotator for moving the 80cm dish in just one plane worked rather well. We acheived good results from satellites at 19, 16, 13, 10, 7'E and unexpectedly, 21'W, though the signal levels varied due to the lack of elevation control. |
| 80cm dish mounted on aerial rotator |
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This soon led to another upgrade: A fully motorised system comprising of a H-H polar mount,motor and a Pace MSS 508ip which were remarkably easy to install. This gave us access to around 250 TV channels and feeds from most of the satellites between 23,5'E and 45'W. |
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With the millenium bug well and truely behind us, 2001 saw the reluctant change-over to Digital. After much deliberation and a number of faulty Strong receivers, we now have an excellent Humax VACI-5300 receiver fed via an external DiSEqC switch and a number of new universal lnb's on dishes giving us access to FTA channels on Eurobird, Hotbird, Astra 1 and Telecom 2C. This again equates to around 250 TV channels. |
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Sky receiver (Panasonic) and VTR with Humax receiver and another VTR below.
80cm dish for Astra1 & Hotbird. 60cm dish for Telecom 2c and the 40cm dish for Eurobird. |
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Our move to Meriden enabled me to redesign the whole dish array once again! It now includes a twin output lnb on the left-hand dish, a Lenson Heath multi-lnb holder with 3 lnb's on the middle dish, and a DiSEqC switch unit behind it. The complete array enables us to watch(from left to right): Astra2/Eurobird1 ; Astra1 ; Hotbird ; Eutelsat W3r & Atlantic Bird3.
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Dual feed reception couldn't be simpler now thanks to these Monoblock lnb's which incorporate DiSEqC switching.
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A
typical installation using a Monoblock on an 80cm dish for Hotbird and
Astra reception.
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| III. | Further information and links |
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For the latest satellite transponder
news:
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...en francais
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For the best satellite transponder
tables:
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...en anglais
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| © G4KUR 2008 |