Overview The MicroHunt is a specialized, ultra-compact continuous-wave (CW) beacon transmitter engineered by Bob Simmons (WB6EYV) under the Doppler DF Instruments brand. Primarily built for Amateur Radio Direction Finding (ARDF) competitions and high-altitude balloon telemetry tracking, the single-board module automates … Continue reading →

Overview The URX-1 is a highly compact, single-band VHF/UHF FM utility receiver engineered by Bob Simmons (WB6EYV) under the Doppler DF Instruments brand. Primarily developed as a lightweight companion receiver for automated pseudo-Doppler radio direction finding (RDF) systems, the module … Continue reading →

Overview The MicroBeacon is a specialized, compact Automatic Packet Reporting System (APRS) position beacon transmitter designed by Bob Simmons (WB6EYV) under the Doppler DF Instruments brand. Engineered specifically for weight-sensitive applications such as radio direction finding tracking, high-altitude weather balloons, … Continue reading →

Overview The PicoDopp is an economical, high-precision pseudo-Doppler radio direction finder (RDF) kit designed for mobile and fixed-station signal localization. Engineered by Bob Simmons (WB6EYV) under the Doppler DF Instruments brand, the hardware functions by electronically cycling an external multi-element … Continue reading →

Overview The SquawkBox is a specialized, low-power hidden transmitter engineered by Doppler DF Instruments for transmitter hunting, foxhunting, and search-and-rescue orientation training. Designed by Bob Simmons (WB6EYV), the hardware module functions as an automated homing beacon by merging a low-power … Continue reading →