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Portable surveillance receiver
The EB-100 is a small portable surveillance receiver build in the 1980s by
Rohde & Schwarz in Munich (Germany).
It was intended for a variety of jobs, including frequency monitoring,
radio surveillance, radio intercept, EMC measurements, direction finding
and bug tracing.
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The EB-100 covers al frequencies between 20 MHz and 1000 MHz (1 GHz) with
a bandwidth selectable between 7.5, 15 and 150 kHz.
The receiver can store approx. 30 frequencies in its built-in memory
(also used for scanning).
All controls, with the exception of the frequency adjustment, are on the
front panel. Frequencies can be entered directly on the 20-button key pad
at the right, and are visible on the small LCD display at the center.
An old-fashined analog meter, mounted to the left of the display, is used as
signal strength indicator.
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The receiver has a carrying strap and a built-in rechargeable battery,
allowing portable use (i.e. carried around the neck),
and is usually stored in a briefcase together with the battery charger,
headphones and other accessories.
It can by used for monitoring the programmed memory channels by using the
(rather slow) scanning feature.
The EB-100 was introduced by Rohde & Schwarz in the 1980s and was the
de-facto standard for many years, until it was replaced in the late 1990s
by the more advanced EB-200.
Even today, the EB-100 is a highly wanted EMC test receiver.
R&S currently promote the feature-packed EB-500 receiver.
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The EB-100 can also be used in combination with the complementary EBZ-100
panorama display to allow part of the frequency spectrum to be monitored in
real-time (around a given center frequency).
The EBZ-100 is fed by the 10.7 MHz IF-signal from the EB-100 receiver and
displays a frequency span of 200 kHz (i.e. the center frequency ± 100 kHz)
on its small built-in green Cathod Ray Tube (CRT).
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HE-100 Directional Antenna
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For finding illegal transmitters and bugs, the EB-100 can be equipped with
the purpose-built direction-sensitive EH-100 antenna.
It uses the terminated loop principle invented by Harold H. Beverage (USA)
in 1938
[2]
[3]
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The EH-100 consists of a suitcase with
three different loop antennas; one for each frequency range (HF, VHF and UHF).
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The EH-100 antenna is sometimes also used in combination with an R&S
portable spectrum analyzer such as the FSH-3 shown here.
The advantage of using an external spectrum analyzer is that it shows
a wider part of the frequency spectrum that the EBZ-100 panorama display.
Once a signal is discovered, the EB-100 is used for demodulation.
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© Copyright 2009-2011, Paul Reuvers & Marc Simons. Last changed: Thu,22 Mar 2012.15:25:46
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