Howard Fuhs
Howard Fuhs
Howard Fuhs

Vintage Gallery

Spectrum-Analyzer FSC3000

This system was in production until 2003

The Spectrum-Analyzer FSC3000 finds and analyses unknown and undesired signals. Its job is to avert bugging operations by tracking down "mini-spy" transmitters (bugs) successfully, reliably and quickly.

A bugging device in the same room is automatically discovered and can be pinpointed with the aid of a handprobe.
The case offers the possibility of also receiving, viewing, analyzing and classifying extremely weak signals.
With the help of optional additional equipment, the case can be used to track down VLF carrier frequency systems, infra-red transmitters and tape recording equipment.
The equipment can be operated with just a few buttons and is menu-driven. That way the case can be used successfully in practice by lesser-qualified technical staff.

Technical Specification

The equipment is controlled by a micro-processor and contains search receiver, code sound receiver, sound correlator, monitor, receiving aerial, handprobes, printer interface as well as an expansion port.

Description of the spectrum

The equipment has a LCD monitor with white background illumination, which allows the whole frequency spectrum of the freely-selected partial areas to be observed. The current, constantly changing frequency spectrum is displayed.


The content of the carrier can be acoustically controlled through the built-in loudspeaker or via headphones, allowing the possibility of listening in more quickly on a freshly-discovered signal.
During the acoustic carrier check, changes in the spectrum continue to be displayed in quasi-real time.

Automatic recognition

The case has a comprehensive measuring technique for automatically detecting a bugging device in the same room.

Sonic Labeling

Controlled by a micro-processor, the receiver is fully automatically tuned through the whole frequency range and/or a freely-selectable starting frequency. The built-in sound generator radiates a beat-note and loads the microphone of any mini-transmitter which is in the room. The receiver checks all incoming carrier signals for the presence of the beat-note. If the beat-note has been received, the search is stopped and a selective succession of sounds are emitted. If this is also recognised, it is certain that a bug is in hearing range of the sound generator and was modulated by the selective succession of sounds. An optical and acoustic alarm is triggered.

You can follow the course of the search process on the digital frequency display and read the transmission frequency of the detected mini-transmitter.

Fast Detect:

The "Fast Detect" function enables fast detection, i.e. approx. 10 sec/1000 MHz, of FM or AM-modulated monitoring transmitters. Every carrier capable of reception is subjected to a selective sound analysis. If a bug is detected in this way, the equipment searches for the spectral components of the carrier which supply the best demodulation.

Deep Detect:

This method of detection searches the whole frequency range for monitoring transmitters of diverse modulation, also taking weak signals in particular into consideration. Each carrier is subject to several methods of detection, thus minimizing the probability of not being detected.

zoom inclick here for a larger image

zoom inclick here for a larger image


  Sweep function

Sweep + Scope
  Sweep funktion with Scope

Sweep + FFT
  Sweep funktion with FFT

Sweep + Waterfall
  Sweep function with Waterfall diagram


The search for the "mini-spy" starts with the external connectable Audio Handprobe handprobe, which only records the stored frequency from now on. The handprobe gives out acoustic impulses and with the aid of the signal phase delay time, the distance from the hidden microphone is calculated and shown on the display.

The optical bar display of the handprobe represents a relative scale for the distance to the bug and enables quick and specific location.

Future safety through software-update

Factory-provided improvements and additions to the system software, which are necessary in the course of technical progress, can be performed through the tube ferrule without dismantling the equipment.

Expansion possibilities

The equipment has an expansion slot. Additional external equipment such as VLF converters, IR detectors, tape detectors, aerial differential adapters or EEPROM storage bases can be connected to this to add to the system. The expansion slot continues to serve as an interface for a factory-provided software-update.

Power supply

The equipment is powered by 6 NiCd mono batteries and can therefore be used portably. The search equipment can be operated by means of a power supply unit /battery charger during longer checks or stationary operation.

Technical Data FSC3000 "Intelligencer" version 3.0
Receiver: Superhet with 5 special PLL synthesizers
Frequency range: 1 MHz to 6000 MHz
Sensitivity: typ. 0.8 uV / 12 dB SINAD to 1 Ghz;
> 10 µV in range 1 - 6 GHz
Dynamic range: 80 dB
Definition: 1000 Hz
ZF band width: 180 kHz / 18 kHz
Input impedance: 50 Ohm
Types of demodulation: WFM/NFM, WAM/NAM
Reducer: 0-32 dB system-driven
System control
CPU: 16 Bit high-speed microcontroller
System memory: 256 K bytes RAM, 256 K bytes ROM
Monitor: 320 x 240 pixels LC-Display
Keyboard: 4x4 number panel, 5 menu buttons, 2 search buttons
Duration of
automatic search:
approx. 8 sec/1000 MHz (Fast Detect),
dependent on carrier occupancy
Audio system
Frequency range: 50 Hz to 15 kHz
AGC-control range: 60 dB
Power output: 0.8 W / 8 Ohm
Audio processor: digitally-controlled high/low-pass filter (18 dB/oct.)
Selective sound Processor: 300 Hz to 6000 Hz, digitally-controlled
Sound correlator: 50 Hz to 15 KHz
ANTENNA: BNC socket, 50 Ohm
HANDPROBE: connection for the handprobe
PHONES: headphone output
MIC: socket for external reference microphone
socket for combined power supply unit/battery charger 110/220V
for loading or operation with mains current
PRINTER: Printer Port RS 232 C / V.24
EXPANSION: connection for addditional equipment
for additions to system, software update
Power supply: 6 NiCd-Mono batteries, exchangeable, or via
power supply unit 110/220 V, 50/60 Hz
(combined power supply unit / battery charger)
Operating time: approx. 2 hours continuous operation
with charged set of batteries, dependent on
the volume of the receiver signal.
Charge time: approx. 8 hours with switched-off equipment,
approx. 14 hours if in operation.
Size: 47 x 36 x 12 cm
Weight: 10 kg
Included accessories: Set of NiCd batteries
power supply unit / battery charger 110/220V
Various aerials
audio handprobe (6m cable)
HF-probe (5m cable)
Optional accessories Aerial differential converter
2 omni-directional aerials with tripod
Graphic printer


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