News

Doppler Systems Delivers Radio Direction Finders to Port Victoria

Ports Victoria selected Doppler Systems to provide radio direction finders to track vessel traffic in Port Phillip Bay, Melbourne Australia. We provided three fixed site direction finders and one mobile. Additionally, we provided a modified version of our TargetTrack software to interface with their AIS receivers. This version of TargetTrack will display the position of vessels in the harbor based on the AIS messages received as well as the bearing lines and position estimates based Read more…

Interference Effects from Nearby Transmitters

A question frequently asked by our customers is “How close can I mount a transmit antenna to the direction finding antenna.”  Typically we respond by telling the customer to keep the DF antenna well separated from the transmit antenna.  However, practically all our customers have limited options on siting the direction finder.  With this in mind, we have written a new application note to help our customers determine the effect of a nearby transmitter on Read more…

FCC Selects Doppler Systems to Provide Radio Direction Finders

The Federal Communications Commission (FCC) has elected to purchase 20 Doppler Systems fixed site radio direction finders. Operating from 100 – 1000 MHz, these direction finders are being used by FCC enforcement agents to locate unwanted and illegal interference.  Doppler Systems is proud to provide the FCC with our direction finders to assist in the ongoing quest to rid the spectrum of unwanted interference. We appreciate the FCC’s great team and the trust they place Read more…

FCC Completes Training on Doppler Fixed Site Systems

Doppler Systems recently hosted fifteen (15) FCC field agents for a three day training event at our University of Arizona Technology Center offices in Tucson, Arizona.  This training covered all aspects of the assembly, checkout, and operation of our DDF7001 fixed site radio direction finders and our TargetTrack software.  Our on-site equipment provided the agents with hands-on experience in locating transmission sources.  Doppler Systems is proud to partner with the FCC in providing them with Read more…

Buckie lifeboat utilizes Doppler RDF

All credit for this article goes to Alan Beresford (author) and the Grampian Online of HNMedia.co.uk. We received permission to post the article in full on our site. The original article can be found here. Training exercise turns real for Buckie lifeboat after distress beacon detected A TRAINING exercise for Buckie’s RNLI volunteer lifeboat crew turned real when a signal from a distress beacon was picked up. The William Blannin and her crew were on a training Read more…

All Star Doppler Direction Finders

The California Office of Emergency Services (CAL OES) deployed mobile Doppler Systems radio direction finders at the 2022 Major League Baseball’s All Star Game. Communications are vital for large events like these where both intentional and unintentional interference can cause disruptions impacting the safety of everyone involved in the event. Doppler Systems provides affordable and quick to deploy radio direction finders allowing public service communications professionals to quickly find and eradicate interference sources. Contact us Read more…

Doppler Direction Finders Used at the Super Bowl

The California Office of Emergency Services, in cooperation with the FCC, deployed one Doppler fixed site direction finder and three Doppler mobile direction finders at the Super Bowl. The direction finders were used to find interfering signals to help enforce the frequency allocations given to the various mobile radio users. Doppler Systems is proud to have been a part of Super Bowl LVI

Doppler Systems is Moving to Tucson

We’re moving! Doppler Systems is moving from its old address in Carefree, Arizona to a new location at the University of Arizona Tech Park in Tucson. We will officially occupy our new space on December 1, 2021. We are excited for the future of Doppler Systems. The University of Arizona Tech Park allows us to expand resources for customer visits and training opportunities. In addition, the area offers access to a diverse array of technical Read more…

Doppler Direction Finders Exhibit Excellent Performance Over Wide Temperature Range

Recently, a customer questioned us on our direction finder’s bearing stability over temperature. Over the years we’ve made some significant improvements in our summing unit so we thought it would be a good time to test the temperature performance of the direction finder. To perform the test, we mounted a fixed site (8 antenna) summing unit in our thermal chamber. We then connected our antenna simulator to the summing unit and connected the summing unit Read more…