
Newsgroups:   rec.video.satellite.dbs
Date:         Mon, 31 Mar 1997 20:19:09 GMT
Sender:       Direct Broadcast Satellite Technology <DBSSAT@LISTSERV.NODAK.EDU>
From:         Rich Peterson <rich@NCS.COM>
Organization: Avalon Networks Inc.
Subject:      US DBS Frequently Asked Questions 

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          US DBS Frequently Asked Questions

          Version 32.  April 2, 1997

----------------------------------------------------------

Richard R. Peterson, President
The DBS Connection
1480 Lark Avenue
Maplewood, MN 55109
rich@ncs.com

NOTICE: This document is Copyright (C) 1997, Richard R.
Peterson. All rights reserved.  Permission is granted to
duplicate this document if and only if the following three
conditions are met:  1. This document cannot be modified in
any way. 2. This document cannot be sold for profit nor
included as a part of any publication sold for profit.  3.
This notice must be included.  Any other use requires the
written consent of the author.

DISCLAIMER: The author makes no guarantee as to the accuracy
of any information provided in this document and is not
responsible for any consequences of its use.

-----------------------------------------------------------

What is DBS?

Several new television services have recently become
available to viewers in the United States allowing
households to receive television programming directly from
satellites on small (18 inch to 3 foot diameter) satellite
dishes which are not movable but instead are aimed at one
position in the sky.

The signals are digitally compressed, allowing several
programs to be broadcast from a single satellite transponder
thereby allowing up to 200 channels receivable with a dish
pointed at one orbital position.  Programming on the various
services includes most major cable services, sports, Pay Per
View (PPV) movies, audio services, and specialized "niche"
programming aimed at smaller audiences. These services are
often referred to as Direct To Home (DTH) services but the
term Direct Broadcast Satellite (DBS) services is more
generally used.

There are currently DBS services available from six
companies with others expected to begin in the coming
months.  Although they still have far fewer subscribers than
the Cable TV industry, DBS services are rapidly adding
subscribers and the industry has very strong growth
potential.  As a result, many companies are interested in
getting into the DBS business.


What DBS services are available today?

Six companies currently offer all-digital DBS services in
the U.S. with their services called Primestar, DIRECTV,
USSB, DISH Network, Sky Angel, and AlphaStar.

Primestar is offered by a group of Cable TV companies and
operates from conventional satellites using 27-36 inch
dishes.  Primestar has been very successful logging over
1.75 million subscribers and capturing over 30% of the DBS
market in its first two years of digital operation.

DIRECTV, Inc. which is a subsidiary of Hughes Communications
offers a service called DIRECTV which operates from
specially designed High Powered DBS satellites receivable
with 18 inch dishes.  DIRECTV is considered the premier DBS
service in the U.S. today.  They have the most channel
capacity available today and have signed up over 2.5 million
subscribers since starting in 1994 capturing over half of
the DBS market.

The United States Satellite Broadcasting Company (USSB) has
partnered with DIRECTV to deliver a complimentary 25 channel
service which use the same satellites and reception systems
and a merged program guide making their services appear as a
single service.  USSB has logged over 1.5 million
subscribers to date.

The DISH Network is provided by EchoStar Communications,
Inc.  They operate from specially designed High Power
satellites receivable with 18 inch dishes.  DISH started in
spring of 1996 so they have a relatively small market share
at this time but their service has proven to be very popular
adding subscribers at a rate comparable to the other
services.  Their success is primarily because they have
entered the market with very inexpensive hardware and
programming which has proven to be very popular with price-
sensitive subscribers and which has caused other providers
to lower hardware and programming prices.

Dominion has partnered with EchoStar to deliver a 6 to 10
channel Christian religious service called SkyAngel which
uses a merged program guide making their services appear as
a single service.  It is too early to tell how successful
Sky Angel will be but it is clearly targeted toward a niche
not served by the other services.

Tee-Comm electronics offers a service called AlphaStar which
uses a 36  dish and operates from conventional satellites.
Their service started in mid 1996 and has added subscribers
at a very slow rate giving them far less subscribers than
the other services.  They say their service is the only one
available to U.S. residents of Alaska and Hawaii and it
appears to be most popular outside the continental U.S.

Because some services share a common reception system and
operate from the same orbital location, viewers may want to
think of the four possible DBS services as 1) PrimeStar, 2)
DIRECTV/USSB, 3) EchoStar/Sky Angel, and 4) AlphaStar.


What equipment is needed?

Each service requires reception hardware that includes a
dish, a decoder, and a remote control. A single decoder can
decode a single channel which can then be routed to several
TV sets and VCRs throughout a household.  A separate decoder
is needed for each TV or VCR that subscribers want to be
able to view a different channel on simultaneously.
Therefore to watch two different satellite channels
simultaneously or to tape one channel while watching another
a household must have two decoders.

Some of the low-end DBS systems contain a dish which only
allows a single decoder to be connected to it while others
allow one or two.  More than two decoders can usually be
connected as well, but that usually requires additional
hardware.

The DIRECTV/USSB service and the EchoStar/Sky Angel service
use systems that allow subscribers to self-install their
equipment, although many choose professional installation.
PrimeStar and AlphaStar require professional installation.


Why is a decoder necessary?

DBS is now a viable alternative to cable TV for one
important reason:  recent advances in real-time digital
video compression technology allow a very large number of
channels to be carried on the same frequency range where
only a few could in the past.  Each of the DBS services uses
a recently developed real-time lossy compression system
which allows an average of about six channels to be
broadcast from a single satellite transponder where only one
channel was possible before.  This results in the DBS
services  ability to broadcast up to 200 channels from a
single orbital location in the sky.  Without digital
compression only 32 channels would be allowed making the DBS
services much less desirable.  The actual number of channels
broadcast by each service varies considerably.



What determines the number of channels on each service?

The various services use different numbers of satellite
transponders.  Further, the number of channels which can be
compressed onto a single transponder depends on a lot of
things such as desired image quality (i.e. resolution),
frame rate of the source material, amount of movement in the
source material, degree of allowable visible artifacts, and
other factors.

Programming containing frames with many fast-moving small
objects such as a basketball game can be compressed perhaps
3 or 4 to a transponder before significant digital artifacts
appear.  Programming containing mostly large still images
can be compressed at a higher rate, perhaps 5 or 6 to 1
transponder.  Movies are filmed at 24 frames per second
rather than 30 for video so they contain less source
material.  In addition, film is not interlaced and is in
general fairly constant from frame to frame.  As a result,
film can be compressed more, perhaps 7 or 8 to 1 transponder
for near laser disc quality.  Compression technology
continues to improve so these may be conservative estimates.


What compression systems do the DBS services use?

Each of the DBS services transmits a bitstream which
contains compressed audio, compressed video, authorization
information, program guide information, and other
information.  The decoders in subscriber s homes decode the
digital bitstream converting it into video and audio which
can be displayed by conventional TV sets.  Each service
requires a decoder designed to work with its system.

Primestar uses a proprietary video compression system
developed by General Instruments called DigiCipher-1.  The
format used by all the other services is based on the MPEG-2
compression standard but also uses some proprietary
components. The EchoStar/Sky Angel and AlphaStar services
use a transmission system based on the DVB standard being
pushed by some companies as a world broadcast standard.  DVB
uses the standard MPEG-2 and also attempts to standardize
more of the systems.


Does this mean the decoders are interchangeable between
services?

No. There is absolutely no decoder standardization in the
DBS world.

DIRECTV and USSB use a common decoder as do EchoStar and Sky
Angel.  Therefore there are four possible decoder types from
which potential subscribers can choose today. These four are
all different and not interchangeable.  While many parts of
the systems are common, each of the four broadcast
bitstreams contain some proprietary information which only
their decoder can understand.  In order to change to another
service subscribers must either sell or otherwise exchange
their decoders for one designed for the new service.  This
includes services which use DVB compliant decoders.

It doesn t really make much difference what transmission
system is used by the DBS providers since they all can
create similar quality audio and video and none are
interchangeable with other services.


Can you tell me more about Primestar?

A group of major Cable Multi System Operators (MSOs) have
joined together to form Primestar Partners, Limited which
offers a digital 90 channel Direct-To-Home service to North
America called Primestar.  This will soon be expanded to
about 160 channels.  They were the first DBS service and
started with 30 analog channels several years ago.  They
converted to digital in 1994 and claim to be the first
digital service beating DIRECTV and USSB by a few weeks.

Primestar is now in over 1.75 million homes the vast
majority of which are in rural areas.  They have been
successful primarily because they are the only service which
does not require customers to buy the decoder or dish.
Instead, they lease it and include the lease cost in the
monthly subscription fees.  They broadcast from a
conventional medium power satellite called GE-2 which
operates from the 85 degree west orbital position so they
use about a 27  diameter dish which must be professionally
installed.

Primestar decoders are manufactured by General Instruments.
Their reception system is called the DigiCipher 1 digital
broadcasting system.   Their decoders are hardware
upgradable meaning hardware update modules can be attached
which allow parts of the system to be updated without
replacing any components.  They have hinted at plans to
migrate to a new MPEG-2 system called DigiCipher 2, but it
is now questionable whether this conversion will ever be
made.

Primestar services can be purchased at Radio Shack stores
nationwide.


What is the DIRECTV/USSB service?

The DIRECTV/USSB service is the premier DBS service
available today offering up to 200 video channels.  This
service uses three specially designed High Power Ku-band
satellites which operate from one fixed position in the sky.
The first (DBS1) uses sixteen 120-watt transponders while
the other two (DBS2 and DBS3) are configured to each use
eight 240-watt transponders.  This results in a total of 32
broadcast transponders.

DIRECTV has sold five of the 120-watt transponders to USSB.
(Actually USSB owns 5/16 of one of the entire satellites
since federal regulations require DBS broadcasters to own
their broadcast facilities.)  The two competing companies
both offer programming receivable with a common dish and
decoder.

The hardware used by DIRECTV and USSB is called Digital
Satellite System or DSS(TM). Sony, Thomson Consumer
Electronics (owner of the Proscan, RCA, and GE names),
Hughes Network Systems, Toshiba, Matsushita (Panasonic),
Uniden and possibly others now sell the DSS receiving
equipment.  The decoders are sold through both satellite
dealers and consumer electronics retailers.

DIRECTV and USSB customers must purchase their decoders.
Prices range from about $300 to $600 depending on the
models.  Rebates and other promotions have dropped the net
price of some models to under $150 when pre-paid programming
subscriptions are purchased.

Each manufacturer of DSS equipment differentiates their
product by providing a unique user interface including their
own on-line program guide with a different look and feel and
different remote controls. The program guides contain
programming information such as descriptions of upcoming
episodes and scheduled talk-show guests.  Each manufacturer
also can choose whether or not to include certain features
such as a Favorite Channel list or a Universal remote
control.

AT&T also sells DSS hardware and DIRECTV and USSB
programming directly to their long-distance customers.  They
have invested significantly in DIRECTV.


What DIRECTV and USSB programming is available?

DIRECTV and USSB share the rights to all 32 broadcast
frequencies at the 101 degree west orbital position.  The
channels carried by each service are unique and do not
appear on each other s services. There is little or no free
programming on either service.

The combined DIRECTV/USSB programming breakdown is
approximately as follows:

70      Channels of major cable services
50      Channels of subscription sports
20      Channels of special interest/niche services
50      Channels of Pay Per View (PPV) movies
10      Promotional Channels
200     Total Channels

The FCC has issued USSB five of the frequencies so USSB
broadcasts from five transponders on one of the 120-watt
satellites giving them about 25 channels.   Their service is
made up primarily of Premium Movie channels including HBO
and Showtime.

DIRECTV has been issued 27 frequencies and programs about
175 channels of programming which can be broken down into
five areas: cable programming, subscription sports, music
services, Pay Per View (PPV) movies, and special
interest/niche services. DIRECTV s cable programming is the
basis of their service.

DIRECTV offers subscriptions to most major professional and
some college sporting events.  They use the addressable
nature of the decoders to allow reception only in certain
geographic locations such as outside the local broadcast
coverage areas. Significant local black-out rules apply
meaning many games viewers may want to watch are not
available in their area.

DIRECTV offers Pay Per View (PPV) movies time-shifted on
about 50 channels with many starting at intervals of at most
30 minutes. Prices for PPV movies are usually $3 when
ordered through the DSS remote control and $5 when ordered
over the phone. Occasionally movies and other special events
are offered at a lower or higher price.

The DSS system has built in copy protection technology which
can control whether or not a PPV movie can be recorded.  The
degree to which this is used is unclear. Some viewers say a
few things they have tried to record have been protected,
but others say nothing they have tried to record has been
protected. USSB says they have no plans to ever copy protect
any of their programming, but some of their PPV events may
have been protected.

Customers with more than one DSS decoder in a household pay
an additional fee of about $5 per decoder.


Can you tell me more about the EchoStar/Sky Angel service?

EchoStar and Sky Angel provide the second High Power DBS
service in the U.S.  EchoStar started operation in early
March 1996 and has already signed up half a million
subscribers thus far.  They are currently offering about 100
channels from their 119 degree orbital position where they
control 21 broadcast frequencies.  Their High Power
satellites are called EchoStar-1 and EchoStar-2.

EchoStar s service, called the DISH(TM) Network, uses a DVB
compliant system which sells for $200 for the basic system
and $300 for a step-up when a prepaid programming
subscription is purchased.  Their decoder has a high-speed
data port for future use. EchoStar says their system can be
self-installed so they sell an installation kit as well.

EchoStar leases a single transponder to Dominion Satellite
from which Dominion provides eight channels of religious
programming called Sky Angel.  The Sky Angel service uses
EchoStar s reception hardware and is complementary to
EchoStar s service in the same way DIRECTV and USSB s
services are today.

EchoStar programming is currently priced lower than the
other DBS services. EchoStar seems to be the only DBS
service to offer any of the Star Trek series programming.


Can you tell me more about AlphaStar?

Canadian based Tee-Comm has recently launched a medium-power
service they call AlphaStar to the U.S.  They are
broadcasting about 120 channels of video and audio services
to 24-inch dishes from AT&T s Telstar 402R satellite in the
89 degree orbital position.  They use a DVB compliant system
like EchoStar manufactured by Tee-Comm Electronics.  They
hope to have up to 200 channels by sometime in 1997.

A key feature of AlphaStar s service is its ability to serve
Alaska, Hawaii, and Puerto Rico.  They have recently
announced a lineup of Spanish-language programming which
should be available later in 1997.  Also, they say they are
the only service to carry X-rated hard core adult
programming.


Does the compression used by the DBS systems really work ?

Yes, but the resulting quality seems to be open to debate.
There are occasional digital artifacts resulting from the
heavy compression used on most of the services.  There is a
significant trade-off each service provider needs to make
regarding quality versus the number of channels available on
their systems.

Many customers report that the video and audio quality are
excellent and the systems work extremely well.   Others
report noticeable digital artifacts on at least some
channels.  The quality seems to vary significantly across
channels in part due to variances in the source material.
At times the video and audio quality on all of the services
is stunning.  Digital TV works.



What about High Definition TV?

DBS is expected to be the first means in which most
Americans have access to broadcast High Definition
Television programming.  The U.S. advanced television system
is digital rather than the current analog system and
terrestrial broadcasters are concerned over the investment
necessary to convert to digital television.  Most think DBS
will prove to be the most cost-effective means of delivering
High Definition Digital Television to homes in the U.S. for
years to come.

Most DBS decoder models contain a very high speed data port
which can be directly connected to a separately purchased
unit capable of decoding the U.S. High Definition television
encoded broadcast stream.  Whether or not the DBS companies
plan to use it remains to be seen.

High Definition channels are expected to occupy as much
bandwidth as four to six standard definition channels, so
the DBS companies will need to carefully consider the degree
to which they offer High Definition channels. Significant
High Definition broadcasts will likely be a few years away
although a few experimental broadcasts could occur late in
1997 or in 1998 on at least some of the systems.



How do I connect a DBS decoder to my home audio/video
system?

There are plenty of options for hooking the decoders into a
home A/V system. TV sets with S-video inputs can use the S-
video output jack on the decoder allowing the display of
pure component (Y/C) video as it was uplinked to the
satellite.  This appears to be most advantageous on those
channels which are broadcast using digital tape or fiber
optic cable as the source.  On those channels, use of the
Y/C port can avoid the conversion from the digital component
signal to NTSC making very high quality images possible.

Viewers who choose to use the RF output to connect their TV
sets do not get stereo or surround sound audio to their TV
speakers.  Stereo sound is available only through the direct
audio output jacks from a DBS decoder.


How is the DBS equipment installed?

The DSS and DISH hardware were both designed to be easy to
install with no professional equipment required.  The dishes
can be installed anywhere there is a direct line of sight to
the satellite with no trees or buildings in the way.  Each
service currently broadcasts all its channels from one
position in the sky so the dish does not need to move. The
dishes typically have a built-in audible signal meter or
blinking LED to indicate signal strength to help position
them during installation.

Homeowners can install the hardware, but professional
installation is recommended. Thomson says the suggested
retail price of a DSS basic installation is $200 but some
installers charge lower fees.  More complex installations
cost more.

Self-installation kits are also available for both the DSS
and DISH systems for about $70.  These typically contain
cables, a compass, a grounding block, a telephone T
connector, and all hardware necessary to mount the dish and
connect it up.  They also typically include a videotape
which demonstrates the installation process.  All the
necessary cables can be purchased at Radio Shack or other
similar retailers, but those who don t have easy access to
supplies may want to consider the self-installation kit.

PrimeStar and AlphaStar equipment must be professionally
installed.


What about watching the broadcast networks and local
channels?

Local channels are currently not carried on any DBS services
so local news and other local programming must be received
over the air (or perhaps via cable).

A network programming package is available on most if not
all services, but it can legally be received by only a
fraction of the DBS customers.  Network programming over the
satellite is available only to those outside the terrestrial
coverage areas of network affiliates as specified in the
Satellite Home Viewer Act recently renewed in 1994.  Those
who can receive network affiliates will not be able to
purchase this package and therefore must get network
programming over the air (or by some other means).

According to the SHVA, if you can receive the networks using
a roof-top antenna you are not eligible to receive them over
the satellite.  You must also not have subscribed to cable
for 90 days. Note that this is Congressional legislation,
not an FCC regulation. The full text of the law is available
on the World Wide Web at:
http://www.law.cornell.edu/uscode/17/119.html

This may change in the future, however.  EchoStar has plans
to uplink local channels from several major cities and spot-
beam them back for reception over their DISH system.  This
could make reception of local channels possible which many
consider a necessity for widespread acceptance of DBS.


I live in the city where there are tall buildings.  Can I
receive a DBS service?

You must have a direct view of the satellite to get any DBS
service with no trees or buildings in the way.


Where in the sky are the DBS satellites positioned?

The DBS satellites operate from 22,300 miles above the
equator at various positions across the U.S.  Dishes are
pointed toward the south with the angle above the horizon
dependent on the distance north of the equator.  Those in
the northern part of the U.S. (such as Minnesota) see the
satellites about 25-35 degrees above the horizon. Those in
the southern part see it higher in the sky.

The DIRECTV/USSB satellites are at the 101 degree West
orbital location which is above a North/South line running
through western Nebraska.  Viewers in the central portion of
the U.S. (such as Texas or the Dakotas) see the satellite
about straight to the south.  On the East coast it is
slightly west of south and on the West coast it is slightly
east of south.

The EchoStar/Sky Angel satellites are at the 119 degree
orbital position.  This is above a north/south line running
through western Nevada.  Those on the west coast will see
the satellite about straight to the south. All others will
see it to the southwest.


Can I connect more than one TV to a single dish?

The DBS dishes connect to the decoders with coaxial cable.
The dish electronics have either one or two coaxial
connections depending on the model so at most two decoders
can be connected to one dish.  It is important to purchase a
package which can allow more than one decoder to connect to
a dish if viewers ever want to hook up more than one decoder
in a household.

Channel Master and perhaps other companies sell a
MultiSwitch which takes both coaxial outputs from a dual
output dish and allows up to four decoders to be connected
to it.  Note that the base units from most manufacturers can
only be connected to one decoder, so the Deluxe unit is
necessary in this configuration.


How do the conditional access systems work?

On most systems, the DBS decoders accept a credit-card sized
processor board called a SmartCard which plugs into the
front and allows the decoder to receive authorized
programming. The authorization stream is sent on each
transponder along with the video and audio information.  The
SmartCard can be inexpensively and easily replaced by the
owner if necessary to help curb piracy.

Pirate DSS SmartCards have been developed and are being sold
now, mostly in Canada.  It appears the other systems have
not yet been broken.  DIRECTV has issued several Electronic
Counter Measures (ECMs) which have temporarily shut down the
pirate cards and they are also distributing smart-card
replacements which are expected to make the existing pirate
cards unusable.  They have pushed for several indictments of
pirate card manufacturers and have helped to successfully
prosecute some.  They say they will vigorously fight against
piracy to protect their programmers, but piracy still seems
to continue.


What other DBS services might be available?

The potential for data services is perhaps the most exciting
aspect of the DBS services. Because the signals are sent as
digital packets, the systems can send video, audio, and
computer data in any combination to the decoders. Most if
not all of the decoders contain a high-speed data port which
can be connected to a computer or another external decoder.
The 24 MHz bandwidth of each transponder can send an
enormous amount of information (at least 23 MBits of data
per second.

EchoStar is the first company to take advantage of data
service capabilities.  They have announced a service called
AgCast intended for the rural farm markets which is a
circularly broadcast news service allowing display of
agricultural news and information on PCs connected to a DISH
decoder through the data port.   The cost is about $70 for
software and cabling plus about $35 per month for the
service.  This is expected to be the first of several data
services offered on the various DBS systems.

DIRECTV has partnered with MicroSoft Corp. to produce a
Windows 95 based PC system which can receive DIRECTV
programming in combination with data services.  Hardware
will be manufactured by Adaptec and perhaps others.  This is
expected to be available late in 1997 or early in 1998.
DIRECTV says data services will be a very important part of
their business in the future.



What are some of the disadvantages of the DBS systems?

Network affiliates provided on the DBS services cannot be
received by the majority of U.S. households.  For those who
can receive them, it is usually not their local affiliate.

Because of the broadcast frequencies used by the DBS
providers, outages can occur as a result of severe
thunderstorms in all DBS systems. The satellites are focused
to send more power to rainier areas to help minimize this
problem, but it does exist.

There are occasional visible digital artifacts which some
viewers find objectionable.  Some claim this is very
distracting while others hardly notice it.  It appears to be
quite subjective.  Nevertheless digital artifacts are a part
of the DBS services.

Some cable TV customers with cable-ready VCRs and TVs are
used to being able to watch one channel and record another
or set their VCR to record two different cable channels
while they are out. The DBS systems, like any system which
requires a decoder, can only decode one channel at a time so
a separate decoder must be purchased for each TV or VCR
which are to be used at the same time.  Also, some models
don t have a program timer to use with a VCR s timer to
record programs on more than one channel at a time.

Many on the west coast are disappointed that programs appear
very early since the services use east coast feeds for most
of their programming.

Although most if not all decoders contain a parental lockout
feature, occasionally violent and sexually explicit programs
are broadcast with no rating so they are available to all
viewers who set the lockout limit at a typical setting.
This makes the parental lockout ineffective.


Where are the DBS uplinks located?

DIRECTV uses a state-of-the-art all digital facility in
Castle Rock, Colorado to uplink all programming to the
DIRECTV satellite.  The center includes several receiving
stations and four 13-meter uplink dishes.  Programming is
provided to the uplink facility via satellite, over fiber
optic cable, and through the use of digital tape.

Equipment in DIRECTV's broadcast center includes more than
300 Sony digital Betacam video recorders, a digital routing
system that includes more than 800 inputs and outputs, and
50 automated playback and recording systems.

USSB uses a 20,000+ square foot all-digital uplink facility
in Oakdale, Minnesota which is near Saint Paul. They are
using two 9-meter Ka-band uplink dishes which are inside a
specially constructed microwave-transparent atrium which
shields them from exposure to the weather.

EchoStar uses a $40 million all-digital uplink facility in
Cheyenne, Wyoming.

AlphaStar uses a $40 million all-digital uplink facility in
Oxford, Connecticut which they purchased from GTE Spacenet.
They use two 13-meter uplinks and one Simulsat 7-meter
downlink.


Can you tell me more about the DSS system?

The three satellites are called DBS-1, DBS-2, and DBS-3.
Each has 16 transponders powered by 120-watt traveling-wave
tube amplifiers (TWTAs) suitable for both digital and analog
transmissions.

The satellites operate in the Broadcast Satellite Services
(BSS) portion of the Ku-band spectrum (12.2-12.7 GHz) and
use circular polarization.  They can deliver 58 to 53 dBW
radiated power over the contiguous U.S. and southern Canada.

Each spacecraft weighs 3800 pounds and measures 7.1 meters
across and 26 meters long with antennas and solar panels
deployed.  The solar panels generate 4300 watts of
electrical power.

The DSS system uses Quadrature Phase Shift Key (QPSK)
modulation to encode digital data on the RF carriers.  The
audio is MPEG-1 Layer II encoded.  Surround sound can be
achieved by encoding the audio with Dolby Pro-Logic before
MPEG encoding.  The video is encoded using MPEG-2 syntax
with up to CCIR 601-1 sampling rates which is capable of up
to 720 x 480 images although lower resolutions are currently
being used.

The system uses a statistical multi-program encoder called a
StatMux that dynamically varies the bit rate according to
video content taking into consideration other programs
multiplexed on the same transponder.

Each of the DBS satellites can be configured for either
sixteen 120 Watt transmissions or eight 240 Watt.  This is
based on the DC power generating capability of their solar
panels.

The DSS architecture can broadcast 40 Mbits/sec per
transponder in either of two error control modes.  In High
mode, 30 Mbps is allocated to information and 10 Mbps to
error control.  In Low mode, 23 Mbps is allocated to
information and 17 Mbps is allocated to error control.  High
mode requires about 3dB more signal power to achieve an end-
to-end availability equivalent to Low mode.

DBS-1 is running in Low mode while DBS-2 and DBS-3 are
running in High mode. Therefore DIRECTV and USSB have 16
transponders at 240 Watts in High mode and 16 at 120 Watts
in Low mode.  A fourth satellite could be added to bring
them all to 240 Watts, but DIRECTV says there are no plans
for a fourth satellite at this time.



How many of these systems have sold and how many do they
expect to sell?

DIRECTV and USSB claim over 2.5 million authorized decoders
to date with that number climbing by thousands every day.
Primestar claims about 1.75 million subscribers to date and
they expect a comparable growth rate to DIRECTV and USSB.
EchoStar now has nearly 0.5 million subscribers and
AlphaStar has about 50,000.

DIRECTV has forecasted 10 to 12 million systems sold within
six years of the start of their operation (which started in
1994). USSB has said they expect to have 40 million
subscribers within 10 years of the start of operation.
EchoStar expects to have 3 million customers by the year
2000.  Most of these seem wildly optimistic.

Industry experts say they expect to see about 14 million DBS
subscribers by the year 2000. The DBS companies continue to
fall short of their very optimistic estimated subscriber
numbers and are selling at a slower rate than anticipated.

DIRECTV believes it will break even in late 1997 when they
expect to have 3 million subscribers.  USSB says their
break-even point is closer to 1.5 million subscribers which
they expect to hit in mid-1997.


Will DBS hardware prices drop in the near future?

DBS decoder prices have dropped drastically in the last few
months mostly in response to very low prices introduced by
competition from EchoStar.  DISH equipment is now priced at
$200 to $300 when purchased with a pre-paid programming
subscription which has severely undercut other providers
prices.  This promotion has proven to be very popular and is
rapidly expanding EchoStar s customer base.  DIRECTV and
USSB have now matched the prices using rebates and other
promotions so a $200 or less DSS hardware system is also
available with a pre-paid programming subscription.  This
represents a drastic drop from the $700 to $900 price of
first generation decoders two years ago.


Can you straighten out some of the acronyms?

The term DBS should be used when referring to all of the
available Direct To Home services so PrimeStar, DIRECTV,
AlphaStar, EchoStar, Sky Angel, and USSB are all DBS
services.  DSS refers to the equipment used only by the
DIRECTV/USSB service and should not be used to describe any
other system.  DISH refers to the equipment used only by the
EchoStar/Sky Angel service.   Sky  is a new name the
EchoStar DISH service will assume later in the year.  TVRO
usually refers to traditional large dish systems although
technically all dishes could be considered TVRO systems.


What DBS system should I get?

That depends on your desired programming, your tolerance for
dish size, what you can afford to spend, what orbital slots
you can see from your location, and several other issues.

DIRECTV and USSB have the highest channel capacity and are
probably the best for subscribers who want the most possible
choice and can afford a number of services.  NFL football
and other sports enthusiasts will also want DIRECTV as well
as those who like a lot of Premium services and Pay Per View
movies and events.

PrimeStar requires the lowest initial investment and does
not require the subscriber to be responsible for equipment
repairs.   Although they use a larger dish, they often have
the lowest cost of entry and are very popular with rural
customers.  The additional 65 channels expected to be added
in mid 1997 should make them more attractive.

EchoStar is the low-price leader with the most inexpensive
hardware and programming costs.  Although they have less
channel capacity than DIRECTV, they have more superstation
type programming and seem to be the only source for Star
Trek programming.  They currently have the most transponder
capacity and will likely have the highest number of
available channels in the next year or two.  Their Sky Angel
partner will be the first choice for those looking for
Christian religious programming as well.

AlphaStar appears to be the choice for those outside the
continental U.S. as well as those who want Spanish language
or X-Rated adult programming.

Each of the service providers are severely in debt and are
continuing to operate at a loss.  When choosing a DBS
service provider, viewers should note whether or not it has
enough cash to continue to operate so they are not left
holding unusable hardware if a service were to cease
operation.  It appears AlphaStar is having some difficulty
at this point, but the other providers seem as though they
will be around for the foreseeable future.  It is too early
to tell how well Sky Angel will do, but even if it fails the
DISH hardware will be usable to receive EchoStar
programming.


What is High Power DBS and how does it differ from DBS?

Several years ago the FCC reserved a portion of broadcast
spectrum and reserved several U.S. satellite orbital
positions for a class of television service they called
Direct Broadcast Satellite (DBS).  The satellite locations
are spaced nine degrees apart from others broadcasting in
the same frequency range (rather than two for conventional
satellites) and these satellites are allowed to broadcast at
a higher power providing interference-free reception on very
small satellite dishes.   This is the FCC s definition of
DBS and they have specifically licensed several companies to
provide DBS services including DIRECTV, USSB, and EchoStar.

It is also possible for companies who are not licensed DBS
broadcasters to offer Direct To Home services from
conventional satellites. To the consumer these Direct To
Home services look identical to licensed DBS services,
except that they generally require a somewhat larger dish
(although still much smaller than conventional dishes) and
they also require professional installation.  As a result,
the definition of DBS is now generally used for any Direct
To Home service using small satellite dishes from a fixed
satellite position but the term High Power DBS is used for
FCC defined DBS services.

The FCC has set aside eight orbital positions at the equator
for U.S.-owned High Power DBS services of which four are to
provide service over the east coast and four over the west.
At each of these slots the FCC is permitting a maximum of 32
broadcast frequencies (transponders).  The FCC assigns DBS
frequencies to applicants in a way that gives them an equal
number of orbital positions from east coast satellites and
west coast satellites.  The idea is that each company can
provide service to the entire continental U.S. by
broadcasting from both their east and west satellites.

However, with today's technology, three of the four eastern
positions (101 degrees west longitude, 110 degrees w, and
119 degrees w) are at longitudes which can actually provide
coverage to the entire continental U.S.  These are the most
desirable slots and they are in very high demand by the DBS
companies.


Are any other DBS services planned?

Communications giant MCI has partnered with Rupert Murdoch s
News Corporation and together they have purchased rights for
28 transponders at the 110 degree orbital slot.  They have
recently announced plans to merge with EchoStar to provide a
single 500 channel service called simply  Sky  which will
operate from several orbital positions including EchoStar s
current 119 degree location and 110, 61.5, and 148 degree
slots.

There are several regulatory hurdles to overcome, but if
allowed to occur the Sky service will likely become the
premier DBS service available and a very signifcant
competitor to Cable TV.   They plan to uplink local
affiliates from several major cities and spot-beam them
thereby allowing DBS viewers to receive their local
affiliates in many parts of the country.  Local affilate
broadcast is considered by many to be the most important
impediment to real competition for cable TV.  It will be
interesting to see how this plays out in the coming months.

USSB owns the rights to 3 transponders at the 110 degree
orbital slot.  It appears they are preparing to launch some
kind of service at that location as well.

Canada, Mexico and some South American countries have been
granted orbital slots which could actually service North
America.  At least some of them will be soon auctioning off
their spectrum and it is expected some U.S. companies will
be bidding on them with the intent of servicing the U.S.

Cable giant TCI was not allowed to use orbital slots
assigned to Canada and/or Mexico for their own high-power
DBS service last year, but they likely will be permitted to
participate in any planned auctions in the future.  They
currently own 11 transponders at 119 degrees but they were
trying to get more since that would likely restrict them to
a service with 100 or less channels.  They have announced
plans to launch satellites into the 119 location and offer
some kind of service from there but details are scarce at
this point.


Where can I get more information?

You can get more information using the following phone
numbers:

DIRECTV Consumer Information  1-800-DIRECTV
DIRECTV Dealer Information    1-800-323-1994
USSB Consumer Hotline         1-800-BETTERTV
USSB Dealer Hotline           1-800-898-USSB
Sony Information              1-800-838-7669
Primestar Information         1-800-PRIMESTAR
EchoStar Information          1-800-333-DISH
AlphaStar Information         1-888-ALPHASTAR

You can also get information at several internet sites.


Where can I find the latest version of this document?

This document is updated and submitted every few months to
the rec.video.satellite.dbs Internet news group.

It is also available on the World Wide Web from John
Hodgson's DBS Home Page at <URL:
http://www.dbsdish.com/index.html> and from DBS Online
<URL:http://www.dbs-online.com/DBS/>

