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Doppler Systems LLC

Radio Direction Finders and Direction Finding Systems

Packaged Direction Finding Systems

Overview Processor Suite Fixed Site Kit Mobile Kit Data Radio Antenna Kit

Processor Suite

The Processor Suite includes all the components necessary for a direction finding system mounted in a chassis and prewired. The antenna connections and external interfaces to the laptop are provided through a simple panel on the front of the chassis. The chassis in turn is mounted in a rugged modified laptop Pelican case, but it may easily be removed by pulling two spring action pull pins on the sides of the case. A cover with a bale mounts over the chassis to protect the equipment inside.  The bale provides a way to prop the Pelican case lid open allowing operation of the direction finder without removing it from the case.  The same processor suite is used for both mobile and fixed site systems.

Doppler DF Suite without Data Radio
DF Processor Suite without Data Radio
Doppler DF Suite with Data Radio
DF Processor Suite with Data Radio
Doppler DF Suite Mounted in Pelican Case
Chassis mounted in Pelican case
Doppler DF Processor Suite
Pelican case ready for transport

The figure below shows a typical arrangement of the equipment in the case.  Each component is mounted to the chassis using hook and loop (Velcro) connections.  The front panel provides

  • Connections for the direction finding antenna
  • DC power connections
  • Radio modem channel switch (optional)
  • Ethernet connection
  • Audio output
  • Auxiliary audio input
  • Laptop power (20 Vdc)
  • Data radio antenna connection
  • Power and data connections for a GPS and compass

DF Equipment Mounted in Frame
Suite Components

The configuration shown is one of several possible equipment complements.  The processor suite is available without the data radio.  A configuration is also available with two direction finding processors and two receivers allowing the user to direction find on two frequencies simultaneously using a single fixed site antenna.