In Broadcast - August 2020 - 46

46

www.inbroadcast.com | Vol: 10 - Issue 8 | August 2020

InAudio

R&S Solid-State Satellite
Amplifiers - Powerful and
Sophisticated
Rohde & Schwarz (R&S) underscore that its solid-state
amplifiers outperform competing technologies...

R

ohde & Schwarz is a company
that has pioneering research
& development running throughout
its DNA. In days where companies
increasingly think short-term - how
are we going to get through the
next quarter, for example - Rohde &
Schwarz bucks that trend. If the goal
is worthwhile, Rohde & Schwarz will
invest significantly over the long term
in the development and realisation of
new concepts.
So it is with the company's recently
introduced
family
of
satellite
amplifiers. The R&S PKU amplifier
family represents a new and radically
different approach to satellite
amplifiers through their use of solidstate enabling technology in place
of traditional tube-based amplifier
systems.
"Developing
the
PKU
family
represented a Herculean challenge for
us, not only in terms of the R&D effort,
but also in manufacturing, so we were
confident that every amplifier will
operate in exactly the same fashion,"
comments Dr Wolfram Titze, Director
of Product Management and Business
Unit Amplifier Systems. "It took longer
than expected, but we achieved our
goals and introduced a range of
amplifiers that are totally efficient
and reliable across the spectrum of
applications."
Robust Functionality
Rohde & Schwarz has developed a
product that is easy to integrate within
existing satellite systems, is compact,
lightweight and efficient in its use
of power. Using the latest transistor

technology, it has introduced a new
family of solid-state amplifiers which
combine the best of both worlds
and offer users new and radically
different functionality. Importantly,
if transistors fail during operation,
the amplifier continues to operate
with reduced output power. With no
high voltages used within the product
it is easy to maintain and it offers a
significantly longer operating lifetime
than its tube-based counterpart.
Moreover, it is possible to equip
the R&S amplifiers with redundant
power supplies, both for AC and DC
operation, so that a power supply
failure does not stop the operation of
the amplifier.
Introducing the amplifiers to
customers that have for many years
used tube-based amplifier products
was always going to be a challenge.
"When an organisation has become
used to one way of working it can
be a challenge to persuade them to
adopt new ways," explains Christian
Baier, Product Manager, Satellite
Amplifiers at Rohde & Schwarz. "If
a tube-based amplifier fails, it fails
completely. Whereas as one of our
customers commented, the PKU solid
state amplifiers never die - even if a
transistor fails, the unit continues to
operate effectively at a slightly lower
power level."
Rohde & Schwarz has developed
two power classes for its uplink
amplifiers: 400W and 750W models
are available as indoor and outdoor
units and for the two frequency bands
12.75 GHz to 13.25 GHz and 13.75 GHz
to 14.5 GHz. The amplifiers can be

R&S PKU100 amplifier

used in large scale fixed satellite
installations
serving
customer
applications such as broadcasters,
telecom & internet service providers,
financial institutions, government and
non-government organisations. At
the same time, the smaller amplifier
can also be used for mobile, vehiclemounted satellite applications.
Adaptive Linearization Option
The PKU-100 amplifiers come
with optional adaptive linearization.
Within satellite uplink amplifiers
signal linearization is critical since it
produces a significantly cleaner signal
from the amplifier. Signal linearization
has been a feature found in several
tube-based amplifiers but until now it
has not been possible to integrate it
within solid-state amplifiers.
The linearization has two effects:
first it improves the inband signal
quality which means better MER
(Modulation Error Rate) respectively
better EVM (Error Vector Magnitude)
or NPR (Noise Power Ratio), which
makes the signal easier to receive.
Secondly, linearization yields much
better out of band performance,
i.e. significantly better shoulder
attenuation which translates into
lower adjacent channel power
and therefore less influence on
neighbouring channels on the satellite.
Revolutionary Technology
The team at Rohde & Schwarz is
busy engaging with satellite operators,
spreading the message about this
revolutionary new amplifier system.
"Maybe the best case so far is a
Scandinavian broadcaster that was
refurbishing its satellite
uplink
networks
and
initially specified tubebased amplifiers," explains
Baier. "But when they first
saw our PKU amplifiers
they changed their minds
and radically changed their

"The PKU solid state
amplifiers never die - even
if a transistor fails, the
unit continues to operate
effectively at a slightly
lower power level"
Christian Baier

system configuration, putting channels
together and specified linearization
within a new tender document that
was built around our technology.
"There is a need to get out and
get our message across about this
terrific new technology. Normally,
the major tradeshows would provide
an ideal opportunity for us to meet
with prospective customers and
demonstrate the systems, but this year
Coronavirus has changed everything
which makes it more challenging,"
explains Dr Titze. "Without NAB and
IBC - and with severely restricted
capabilities to travel and meet
customers at their premises we need
to think and act differently.
"Already, we have developed
an intuitive series of online
demonstrations
that
graphically
illustrate the power and sophistication
of the PKU amplifier family. And
we have created a large stock of
demonstration units which we
can ship to potential customers to
provide a proof of concept," Dr Titze
explains. "In many applications, the
PKU satellite amplifier family offers
users with a unique proposition.
Even despite the social distancing
restrictions imposed by this global
pandemic, we are determined to
communicate this fantastic news."

For more information on the R&S
PKU amplifier family, and to request
an online demonstration, please
contact Christian Baier at Christian.
baier@rohde-schwarz.com


http://www.inbroadcast.com https://www.rohde-schwarz.com/uk/products/broadcast-and-media/solid-state-power-amplifiers/solid-state-power-amplifiers-sspas-_232414.html https://www.rohde-schwarz.com/uk/products/broadcast-and-media/solid-state-power-amplifiers/solid-state-power-amplifiers-sspas-_232414.html https://www.rohde-schwarz.com/uk/products/broadcast-and-media/solid-state-power-amplifiers/solid-state-power-amplifiers-sspas-_232414.html

In Broadcast - August 2020

Table of Contents for the Digital Edition of In Broadcast - August 2020

Contents
In Broadcast - August 2020 - Intro
In Broadcast - August 2020 - Cover1
In Broadcast - August 2020 - Cover2
In Broadcast - August 2020 - Contents
In Broadcast - August 2020 - 4
In Broadcast - August 2020 - 5
In Broadcast - August 2020 - 6
In Broadcast - August 2020 - 7
In Broadcast - August 2020 - 8
In Broadcast - August 2020 - 9
In Broadcast - August 2020 - 10
In Broadcast - August 2020 - 11
In Broadcast - August 2020 - 12
In Broadcast - August 2020 - 13
In Broadcast - August 2020 - 14
In Broadcast - August 2020 - 15
In Broadcast - August 2020 - 16
In Broadcast - August 2020 - 17
In Broadcast - August 2020 - 18
In Broadcast - August 2020 - 19
In Broadcast - August 2020 - 20
In Broadcast - August 2020 - 21
In Broadcast - August 2020 - 22
In Broadcast - August 2020 - 23
In Broadcast - August 2020 - 24
In Broadcast - August 2020 - 25
In Broadcast - August 2020 - 26
In Broadcast - August 2020 - 27
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In Broadcast - August 2020 - 46
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In Broadcast - August 2020 - 57
In Broadcast - August 2020 - 58
In Broadcast - August 2020 - 59
In Broadcast - August 2020 - 60
In Broadcast - August 2020 - Cover3
In Broadcast - August 2020 - Cover4
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