I recently decided to calibrate my HP 4195A network/spectrum analyser. While I had the device open, I also dumped the firmware (28 EPROMS!)
Recently I needed a N type calibration kit. We don’t have one at work, but since I already have gained some experience with building a SMA calibration kit, I decided to make my own N kit!
I have a good old HP 8753C vector network analyser in my shack, however, I miss a proper SOLT calibration kit. Here is how I built my own calibration kit and made a model for the 8753C.
In the service manual of the HP 8753C, I read something about a cavity oscillator which is used in this instrument. Later, I read some article in the HP Journal, also about cavity oscillators. Time to build my own!
At a former employer, they threw away a HP 4195A network analyser. The reason was because it had some problems with its internal source. I kept the unit for a few years and always was afraid of opening it and repairing it because I thought the potential to further damage it was too high. But now I tried to repair it and it worked 🙂
A few years ago, I bought a HP 8753C network analyser. The cool thing is: it has options 06 (6 GHz operation) and 02 (time domain). Unfortunately, recently it showed an annoying error message.
Just for fun I tested whether it is possible to draw a fractal with Matlab. (Yes, it is, no big surprise 😉 )
This was a lab project during the bachelor’s in state-space control.
This is my collection of formulae which I made during my bachelor’s and master’s studies. Since then, I use it a lot and of course I will further extend it. Continue reading Collection of formulae