Engineering introduces the PowerClamp series of
Transient Voltage Surge Suppression (TVSS) units
by Sine Control Technology, Inc. Thousands of these
highly effective TVSS units have been in use since
the early 1980's in the defense*, medical, petroleum,
and manufacturing industries. Their superb performance
and reliability is now available to the broadcasting
industry. (*Sine Control has been selected as
a Justified Sole Source supplier of TVSS units
to the United State Department of Defense.)
broadcast equipment demands clean power. Power
line spikes, surges, and waveform distortions
will produce system reliability problems, data
errors, intermittent or unexplainable operation,
computer lockups and failures. PowerClamp TVSS
units virtually eliminate the power line spikes
and surges that cause these malfunctions and failures.
PowerClamp TVSS units are the most advanced TVSS
units in the industry. Their unique design utilizes
multi-stage hybrid circuitry to yield clamping
levels as low as 2 volts above the AC waveform.
Where other units won't clamp a surge until it's
500-800 volts above normal voltage, PowerClamp
TVSS units instantly attenuate surges within a
few volts of the AC waveform. Their highly
effective surge suppression and waveform tracking
results in superior AC waveform integrity, i.e.,
"clean power" without spikes, surges, noise, harmonics,
PowerClamp TVSS units are designed specifically
for broadcast applications. They are ideal for
installation at transmitter sites where massive
power surges and lightning-induced transients
are a major cause of transmitter unreliability
and damage. PowerClamp units will drastically
reduce tripped breakers, transmitter shutdowns,
and prevent or minimize damage to transmitting
equipment caused by such power surges.
TVSS units should also be installed at studio
locations to prevent power line problems from
causing malfunctions and damage to audio/video
equipment and computers. PowerClamp units will
eliminate power line spikes from entering a facility
from the main AC feed line. Their bi-directional
design will also prevent power line noise, spikes,
and disturbances generated within the facility
from being distributed to other equipment.
TVSS units are always installed IN PARALLEL with
AC feed lines. They suppress power line spikes
and surges by shunting them to ground. PowerClamp
units do not need to be "matched" to the equipment
they are protecting, nor do they introduce any
loss in the line.
TVSS units are available in 4 series to accommodate
on blue area or photo to view specifications)
||For transmitter sites with extreme lightning risk. 200,000 surge amps per phase.
transmitter sites where lightning is frequent.
150,000 surge amps per phase
transmitter sites where lightning is occasional.
100,000 surge amps per phase
studios, sub panels, in non-lightning areas.
60,000 surge amps per phase
units for studios, computers.
20,000 surge amps per phase
About a year ago I installed a Power Clamp TVSS unit at our KCKM-AM transmitter sight. We were upgrading from 5kW to 12kW and I wanted to protect the new transmitter from "dirty power". We’re located in the middle of an oil field about 8 miles out of town, and I used to replace about 30 MOSFETs each year in our 5kW solid state transmitter. Now, with 13 months since PowerClamp’s installation, I have not had to replace one.
Bob Souza, Managing Partner, KCKM Monahans, TX
"At KPWR (Los Angeles), our CCA transmitter would
occasionally trip breakers and go off the air
without any obvious cause. I had installed a PowerClamp
unit at KWVE a few years earlier when they had
a similar problem, so I installed one at KPWR.
The PowerClamp unit solved the KPWR problem
immediately. Since then, I have installed
PowerClamp TVSS units at KSCA (Los Angeles) and
will soon install one for KLVE (Los Angeles).
I've made it my 'standard operating procedure'
to install a PowerClamp unit at any transmitter
site I'm responsible for. They're not 'snake oil'...they
Koza, Chief Engineer, HBC/UniVision Inc.
KLVE/KSCA, Los Angeles
"At KBIG (Los Angeles) we had continuing problems
of our transmitters throwing breakers, unexplainable
input power glitches, and a host of other power
line-related problems. Ever since we installed
the PowerClamp TVSS unit, our problems pretty
much just went away. You can't beat it. You
just install it and forget about it. They work
Greiger, Chief Engineer KBIG, Los Angeles
"We use a pair of Continental 816 transmitters,
which use internal SCR regulators to control the
screen and plate voltages. We had a continuing
problem that was caused by the 3rd and 5th AC
power line harmonics generated by these SCR regulators.
When the voltage of one AC phase was high, the
SCR regulators would kick in, generate lots of
3rd and 5th harmonics on the AC power line, which
would cause the other transmitter to go off the
air. The two 816s would fight each other, knocking
each other off the air. When we installed a
PowerClamp TVSS unit, it totally solved the problem.
The PowerClamp unit attenuated the power line
harmonics by about 50db, which we verified on
a Fluke network analyzer. We haven't had this
problem since, and IÕll be ordering another PowerClamp
when we install a new BE transmitter very soon."
Chuck Ide, Chief Engineer KYSR, Los
"For about 18 months we had a situation in which
our FM transmitter would go off the air from an
unexplained tripping of the main power breaker.
This would happen once or twice each month. The
power company could find no reason for the problem."
"Last December, we installed a PowerClamp TVSS
on the power lines at the breaker box. It is
now June, and we have had no reoccurrence of the
Pemberton, Chief Engineer KSKW Radio, Los
have two PowerClamp units installed at our Burbank
studio complex, mostly as a preventative measure.
You can never be too sure about what comes thru
the AC lines in a very large office building,
but we haven't had any problems. PowerClamp
is a good, practical, down-to-earth product."
Martin, Chief Engineer KZLA, Los Angeles
we moved our transmitter to Mt. Wilson (Los Angeles)
in 1994, we installed a PowerClamp unit as a preventative
measure. I've never had any power problems.
It really does the job. They work great."
Pallock, Chief Engineer KKLA, Los Angeles
"Several months ago our Harris FM 20K transmitter
began a long series of off-the-air problems. Two
sets of brand new circuit breakers at the transmitter
building would be tripped. With no power to the
transmitter or STL, someone had to drive up to
the transmitter site, reset both breakers and
put the transmitter back on the air. This kept
happening for nine months, sometimes 3 or 4 times
a week. San Diego Gas & Electric... provided a
23-page report explaining how it was not the fault
of anything the power company was or was not doing."
"After exhausting every other possibility we could
think of, we turned to your PowerClamp line conditioner.
Since the new line conditioner was installed
August 29th, KWVE's transmitter has remained on
the air without incident. Many thanks on behalf
of KWVE radio and its listeners."
Bryon Peters, Manager KWVE-FM, San Clemente,
consider this to be a testimonial letter regarding
our use of your TVSS over the last year. Based
on quality and performance, your units have
done more than we expected and we would not hesitate
to recommend its use to anyone."
Fred Dumpel, Plant Engineer NBC, Burbank,
"The variable quality of the 120-volt AC power
supplied to the TeleSat Centre has caused considerable
degradation to the quality of video and audio
recordings. Recently, we installed a PowerClamp
unit for evaluation. This unit appears to work
very well. There has been noticeable reduction
in audio hum and noise, and elimination of video
noise. It appears to eliminate noise created
by our projector motors, dimmers, and florescent
lighting, and also reduces noise generated by
other hydro customers."
Darwin Veroba TeleSat Canada
"Several PowerClamp TVSS units were installed
on a test basis at (six airports in Southern California).
Prior to the installation of the units, each of
the facilities had experienced equipment problems
due to power fluctuations. There have been
no power related problems since their installation
Muckle, Manager Los Angeles AFS, US Dept.
of Transportation/Federal Aviation Administration
"The San Diego sector has installed three of your
devices at different desert navigational facilities
(VORTAC). These desert facilities were selected
because they had a history of intermittent alarm
which the technicians were unable to isolate.
After installing your devices, our intermittent
alarms dropped drastically."
John Svoboda, Asst. Manager, Tech Support
Dept. of Transportation, Federal Aviation Administration
"Lightning Diverter Systems Inc. installed a PowerClamp
TVSS in April 1991 to protect the input power
of a 50 KW UPS power system. The 1989 lightning
caused damages estimates exceed $120,000. Our
customer reports a significant improvement in
equipment reliability and availability since completion
of lightning protection measures that included
installation of the PowerClamp suppressor."
Donald Covington, President Lightning
Diverter Systems, Inc
"As you are probably aware, we've been experience
problems in our electrical systems. When the emergency
generators were being tested, the computer located
in the Clinical Lab would lose its memory and
the Farrington Addressograph would run constantly.
Since the installation of the wire-in TVSS
device six weeks ago, we have had no problems."
"We are very please with this device and highly
recommend it to others who are experiencing transient
Brown, Supervisor, Biomedical Dept. Los
Robles Regional Medical Center
"As you well know, our ICU equipment was persistently
being "Knocked Out" by a heavy voltage surge,
generated by the weekly "Switchover" to emergency
power. With the installation of your two suppressors,
one at the main entry panel and the other at the
distribution panel feeding the ICU equipment,
the problem has been eliminated." "We are
extremely satisfied with our investment and would
not hesitate to recommend your product to others
with similar voltage problems."
Yap, Director of Nursing Long Beach Hospital
TVSS units improve system reliability and prevent
equipment damage caused by power line disturbances!
pricing, please see the product spec sheets.
To order, contact any Henry Engineering Dealer.
To find a dealer near you.
free technical assistance about PowerClamp, please
contact Jim Loupas Associates: Tel: 972-304-0455
E-mail: firstname.lastname@example.org or visit www.jimloupas.com