My name is David Cunningham
I am a retired electrical engineer living in San Miguel de Allende Mexico. Prior experience included control system design for spacecraft subsystems at Honeywell.
While working at Honeywell, I developed an interest in radio direction finding. After 30 years at Honeywell, I left in 1993 to form a new company Doppler Systems Inc. which subsequently provided thousands of RDF systems to the FCC, Coast Guard, US Military and commercial radio system operators.
Since retiring to San Miguel in 2010, I have continued to consult for Doppler Systems, but in addition I have remained busy with electrical rewiring, acoustic system design, lighting and hot water system analysis and testing. I enjoy writing up my findings which helps explain the diverse topics on this website.