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Doppler Systems does not make vehicle recovery systems but our designs and direction finders are used in many of them. We recommend you contact Pegasus Technologies, www.pegtech.com for information on their vehicle recovery system which uses a proprietary version of our radio direction finding system.
Doppler Systems does not make complete trailing/tracking systems and in particular, we do not sell transmitters. We recommend you contact Schell Electronics, at www.schellelectronics.net for information on their covert transmitters.
For applications where the DF antenna must be located very close to a transmitter, we recommend using the input limiter devices made by Antenna Authority, Inc. These are available in an in-line package with TNC connectors. Please see www.AntennaAuthorityInc.com for more information.