In general it is not good practice to locate a transmitter close to a direction finding antenna. But how close is too close? We’ve updated our application note on this subject. In the application note we calculate the separation required to insure that there is no damage to the direction Read more…
Doppler Systems recently completed a build of 15 fixed site systems and 7 mobile systems for one of our customers. We thought you’d like to see some photos we took during the manufacturing and test of these system. All of the final assembly and test is performed in our Carefree, Read more…
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. Read more…
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 Read more…
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 Read more…
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 Read more…
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 Read more…
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 Read more…
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 Read more…
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 Read more…