R&S®DDF®195 Digital Direction Finder

0.5 MHz to 3 GHz

This is a discontinued product
Please note the following successor product(s):

Key Facts

  • Direction finding of signals with almost any modulation
  • Wide-aperture behaviour above 300 MHz
  • Very short signals of 10 ms detectable

Brief Description

The R&S®DDF®195 Digital Direction Finder can be operated in accordance with two DF methods using digital signal processing: the tried and tested Watson-Wattmethod (HF band) and the advanced correlative interferometer method (VHF/ UHF band).

Features

  • Direction finding of signals with any modulation
  • Wide-aperture behaviour above 300 MHz
  • Very short signals of 10 ms detectable

Key Facts

  • Direction finding of signals with almost any modulation
  • Wide-aperture behaviour above 300 MHz
  • Very short signals of 10 ms detectable
  • High accuracy and sensitivity
  • Bandwidth setting independent of receiver
  • AC supply or battery operation
  • Simultaneous operation of all DF antennas (HF and VHF/UHF) without replacing antennas

Brief Description

The R&S®DDF®195 Digital Direction Finder can be operated in accordance with two DF methods using digital signal processing: the tried and tested Watson-Wattmethod (HF band) and the advanced correlative interferometer method (VHF/ UHF band). In the latter case, the complex antenna voltages of the signal receivedare compared with stored reference values and then checked for maximum correlation. This DF method enables the implementation of wide-aperture DFantennas comprising only a few antenna elements and covering wide frequency ranges without division into subranges. The system allows direction finding of signals with any modulation. Three operating modes can be selected on the DF processor:

NORMAL

In this mode, which is preferably used for monitoring radio networks, the DF process is started and stopped by the squelch of the DF processor. The bearing display follows the various directions of incidence of the signals without any delay.

GATE

This mode is used for direction finding of transmitters whose emissions are interrupted briefly by modulation (e.g. keyed transmitters) if the transmitter on-the-airtime is too short for the NORMAL operating mode.

CONT

In this mode, direction finding is performed continuously so that a bearing may be obtained even for specially modulated or very weak signals for which the DF processis not triggered by the squelch. In each of these modes, bearings can also be displayed in a histogram, which is of advantage in the analysis of communication networks.

Histograms display the current (three-digit number), and all values obtained since the activation of this display mode are shown as radial beams indicating the direction of incidence. The lengths of the beams are a measure of frequency occurrence of the bearings. Results can be output as lists.

The display mode can also be switched to QDM (heading with reference to magnetic north).

In the NORMAL mode, the indication disappears as soon as reception of the DF’d transmitter is over. In the other operating modes, the DF process is terminated bythe user. The bearing determined last is stored and can be recalled at a keystroke. It is, however, overwritten by the next bearing value.

Evaluation according to the correlative interferometer principle plus the DF quality factor Q provide reliable information about interference in the incoming wavefield. The built-in quality filter ensures that all bearings with a quality value below a settable quality threshold are suppressed. Reliable DF results can thus be obtained even in mobile operation in built-up areas.

Upon system initialization, the DF antenna system can be electronically oriented to north, so that there are no restrictionsto beobservedformechanical setup of the antenna. The scanning noise caused by the DF process in single-receiver direction finders can be switched off for monitoring purposes by interrupting the DF process(DF/AF switchover).

Several test routines are integrated in the direction finder, which can be powered either from the AC supply or a battery.

Features & Benefits

  • Direction finding of signals with any modulation
  • Wide-aperture behaviour above 300 MHz
  • Very short signals of 10 ms detectable
  • High accuracy and sensitivity
  • Bandwidth setting independent of receiver
  • AC supply or battery operation
  • Simultaneous operation of all DF antennas (HF and VHF/UHF) without replacing antennas
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