News

Importing Placemarks in TargetTrack

Doppler Systems Blog We just released version 3.2.11 of TargetTrack. When using the Great Maps facility in TargetTrack this version allows the user to import placemarks from a .gpx file. This is a standard export format for Garmin software.  To download the latest version of TargetTrack head on over to our downloads page.  Feel free to e-mail us or call us with any questions.

Direction Finding Simultaneously on Multiple Frequencies Using One Antenna

Doppler Systems Blog One of the often overlooked features of the Doppler DDF7000 series direction finders is the ability to direction find on several frequencies simultaneously using a single antenna.  This is most often used in a fixed site system.  All that is required is a DF processor and receiver for each frequency to be monitored and a RF splitter.  The input of RF splitter is connected to the RF output of the antenna and Read more…

Using Doppler Direction Finders with AOR DV1 Receiver

Doppler Systems Blog Recently one of our customers requested that we include the AOR DV1 as a receiver option.  We are always happy to support as many receivers as possible, so we gladly agreed.  Our customer sent us a DV1 and we proceeded to add the firmware to control the frequency, squelch, and volume.  Since each receiver requires a different set of calibration constants we performed our calibration routine and entered the constants.  All appeared Read more…

Direction Finder Sensitivity

Doppler Systems Blog In our specifications we call out a sensitivity specification of -123 dBm.  A detailed explanation of how we define sensitivity is given in our technical application note entitled RF Sensitivity of Series 7000 (MPT) DF but I thought I would hit the high points of the application note as a way of providing an overview of what we mean by sensitivity.  Our direction finding processor allows the user to set a sensitivity Read more…

Doppler Product Design and Manufacturing

Doppler Systems Blog Occasionally we are asked about how we build and test our products. So, I thought I’d share a little about our design and manufacturing process. We design all our products locally using in house engineers and some outside consultants.  This includes all the schematic design, printed wiring board design and mechanical drawings of our antennas.  Additionally we develop our own firmware and our software.  During the design process we work with our Read more…

Release of Firmare Version 2.34

Doppler Systems Blog We’ve just released version 2.34 of the firmware.  This version fixes two recently discovered bugs.  Bug 1 occasionally caused the DF processor to miss commands sent to it by the software.  This occured when the commands were sent rapidly and the underlying Windows IP socket chose to buffer the first command with the second command. Bug 2 caused the processor, under some conditions, to go offline when the number of connections exceeded Read more…

Smooth Summing Results in Excellent DF Sensitvity

Doppler Systems Blog Some people insist that radio direction finders based on the Doppler principle suffer from low sensitivity.  Recently I saw a claim from one of our competitors that their unit was 10 dB more sensistive than psuedo-Doppler based direction finders.  This is simply not true, and our data backs it up (see RF Sensitivity of Series 7000 (MPT) DF).  Although some direction finders do suffer from low sensitivity, it is not due to Read more…

Software Improvements

Doppler Systems Blog Last week I attended the NSREN conference in Orlando.  A big thanks to Paul Coburn for inviting us.  During the discussion times a number of good ideas were suggested for improving our software.  Throughout our history our customers have made suggestions for new features and new applications and our software is so much better because of those suggestions.  So please if you see something in our software you would like changed or Read more…

New Version of MPT User Interface

Doppler Systems Blog We added a feature to the MPT User Interface program to allow a user to save the direction finder settings to a file. Once you have the direction finder settings the way you like them you can save them. If someone changes the settings you can always restore them to their saved values. The new version is available for download on our downloads page.

Doppler Systems Helps Find Culprit Jamming Aircraft Transmissions

Doppler Systems Blog Recently someone made hoax calls to pilots, causing a passenger flight to abort landing as it approached Melbourne Airport in Australia. In total there were 15 unauthorized transmissions on aircraft frequencies in the Melbourne area (see article here).  The Australian Communications and Media Authority deployed a Doppler Systems radio direction finder to assist the Australian Federal Police in finding the culprit.  Thankfully he was found and has been arrested (see article here).