My employer wanted to throw away a HP 8341A signal generator. This is a 10 MHz to 20 GHz sweep generator! Of course I rescued that unit from trash….
Design of a coaxial cavity filter
Here I show how I designed a coaxial cavity bandpass filter. The method of Dishal is employed, using the k and q values. This was part of my Master’s Thesis, but here it is explained in more detail.
Master Thesis & some other RF stuff
Here you can find my Master’s Thesis 😀 Have fun reading.
HP 4195A firmware dump
I recently decided to calibrate my HP 4195A network/spectrum analyser. While I had the device open, I also dumped the firmware (28 EPROMS!)
Self-made N calibration kit
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!
Homebrew SMA calibration 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.
Cavity Oscillators
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!
Repair of a HP 4195A network analyser
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 🙂
Repair of a HP 8753C network analyser
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.
Fractals with Matlab (or Octave)
Just for fun I tested whether it is possible to draw a fractal with Matlab. (Yes, it is, no big surprise 😉 )