News

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…

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…

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…

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…

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…

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

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…

Today, Doppler Systems provided five, three-band mobile radio direction finders to the California Office of Emergency Services. Doppler is proud of our long standing relationship with CAL OES providing both fixed and mobile direction finders.

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…

The availability of inexpensive transceivers has resulted in increased jamming of critical public service radio services.  Utilizing Doppler Systems’ radio direction finders allows you track down interference and criminal jamming quickly, so you can get your critical radio systems back online. In May 2020, Allen county sheriff’s officers received complaints from fire and law enforcement entities of radio interference issues. Luckily they were able to locate the radio interference problem after a few days. See Read more…