Our success here at Doppler Systems requires a team effort. Our vendors routinely go above and beyond all our expectations. They are all based in the United States (most of them in the Phoenix area) and their contribution is key to us delivering high-quality radio direction finding equipment to our many customers. So, we’d like to acknowledge them (in no particular order) QuikTek Assembly For nearly 10 years QuikTek assembly has been our contract manufacturer Read more
We recently added support for the ICOM R8600 receiver to the DDF7001 processor. If you are interested in using this receiver please download the firmware upgrade (v 2.35) and the latest versions of the MPT User Interface and TargetTrack 4 software. Let us know if you have any problems with the new software. If there are any additional receivers you want us to support, please contact us.
Our founder David Cunningham has sold his share of Doppler Systems to Brenda Holmes. Dave will continue to provide technical support and consulting. Doug Havenhill will be responsible for the day-to-day operations of Doppler Systems. Brenda will be responsible for development of the next generation of Doppler Systems radio direction finders.
Doppler Systems is excited to announce that Brenda Holmes has joined our team. Brenda has a MSEE from University of Arizona specializing in RF and antenna design. She also has 14 years of electronic circuit design experience. She will be in charge of all our circuit and antenna design activities.
We sell our mobile direction finders in two different configurations: our component configuration and our packaged configuration. The direction finding performance is identical for both configurations so why do we offer two configurations? The answer boils down to customer needs and preferences. The minimal component configuration consists of a direction finding processor, an antenna summing unit, and a set of antennas. To this complement of equipment the customer adds a narrow band FM receiver and Read more
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 finder. We also calculate the level of desense caused by nearby tranmitters and the separation required to provide optimum direction finding performance. If you are 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, Arizona facility.
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.
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 the output of 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 way of providing an overview of what we mean by sensitivity. Our direction finding processor allows the user to set a sensitivity threshold. The higher Read more