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Doppler Systems LLC

Radio Direction Finders and Direction Finding Systems

Doppler Radio Direction Finders and Direction Finding Equipment

Mounting a DF Antenna to the Side of a Tower

September 06, 2016

Over the years many of our customers have asked about mounting the DF antenna on the side of a tower or mast. Will it work? The short answer is not very well. We've posted the results of some extensive modeling we've done to predict the error associated with side mounting the DF array on a tower. To achieve a less than 5 degree peak error at 150 MHz the array must be mounted over 8 feet from the tower. To achieve less than 2 degree peak error the array must be 75 feet from the tower.

The conclusion is that for best performance the DF antenna array must be top mounted on the tower or mast and away from any significant RF transmtters.  Please contact us if you have any questions.

Improved Mapping in TargetTrack

September 02, 2016

We released TargetTrack 3.2.0 last week. Several of our users had requested that we improve our bitmap based mapping functions. The previous versions of TargetTrack limited the map file size and the level of zooming. The new version allows for much larger file sizes and considerably more zoom levels. We've also added some more map like zooming and panning tools.

The bitmap mapping facility in TargetTrack allows our users to make their own custom maps using screenshots or scans of physical maps. Use our MapFix utility and you then have the map that you want.

We also have our Great Map function so that you can use online mapping data from several different mapping data providers e.g.OpenStreetMap, Google, Bing.

Download the latest version of TargetTrack from our Downloads page and let us know what you think.

Welcome to our Blog

September 01, 2016

Welcome to the Doppler Systems blog. Our blog will give us the opportunity to keep you up to date on our latest products and software releases as well as offer helpful hints to enable you to use our products more effectively.

Thank you for visiting and contact us if we can be of any assistance