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DF-6
Radio Direction Finder - this page is a stub

DF-6 is a mobile radio direction finder (RDF), based on the Watson-Watt principle with Adcock antennas, introduced around 1999 by Datong in Leeds (UK). The device is based on an existing ICOM R-7000 receiver, 1 and is suitable for the reception of continuous AM, FM and SSB signals. It was used by amateurs as well as by law-enforcement agencies for finding clandestine stations.

The image on the right shows the later DF-6B variant of the receiver. It is housed in a grey metal enclosure, of which about 2/3rd of the front panel is taken by an ICOM R-8500 receiver, which has been modified for this application.

To the left of the R-8500 receiver is the bearing display (rose), some additional controls, and sockets for extenstions. The device can be fully operated from the front panel, but in a mobile environment the use of the DFC-2 controller-display is recommended. This external control unit is similar to the DFC-1 of the DF-5 receiver.
  
Image of a DF-6B inside a vehicle. Source unknown.

Unlike the Datong DF-4 and DF-5, which were based on the correlative interferometer principle, the DF-6 is not suitable for locating tracking beacons that feature pulse transmission. It is merely intended as an affordable alternative to regular direction finders that are used for locating (illegal) transmissions and other sources of radio frequency interference (RFI).

  1. Later versions, like the DF-6B, were based on the ICOM R-8500.

Documentation
  1. DF-6B User Manual
    Datong Electronics, September 2001, Issue 2.0.
Further information
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Crypto Museum. Created: Wednesday 03 February 2021. Last changed: Monday, 06 September 2021 - 12:21 CET.
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