Here is a quick project I made one weekend. I had just gotten my new toys, a Rohde & Schwarz FSIQ 7 GHz spectrum analyzer and two R&S SME 03 signal generators. I wanted to make something where I could employ my new test gear, so I decided to make a microwave noise source. The noise source is quite simple. It has a reverse biased AT41486 RF-transistor and the noise due […]
I am currently building an FMCW radar. I do not have all the parts finished so I made a doppler radar from the parts I had on hand. Theory Basically a Doppler radar is a type of radar which measures speed of objects in front of it. The transmitted signal is mixed with the received frequency in a frequency mixer. If an object moves in front of the radar, the received […]
I had some space left on a PCB panel I was ordering so I quickly whipped up a return loss meter based on an AD8319 logarithmic detector from Analog devices. The AD8319 is specified up to 10GHz. The circuit has a 10dB attenuator and a resistive SWR bridge which output is measured (differentially) with the log detector. The circuit is laid out on 0.8mm FR4 PCB with impedance matched microstrip transmission […]