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Monthly Archives: May 2017

RF stuff

Self-made N calibration kit

May 31, 2017 tobias Leave a comment

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!

Continue reading Self-made N calibration kit →

RF stuff

Homebrew SMA calibration kit

May 23, 2017 tobias Leave a comment

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.

Continue reading Homebrew SMA calibration kit →

RF stuff

Cavity Oscillators

May 23, 2017 tobias 2 Comments

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!

Continue reading Cavity Oscillators →

Measurement equipment

Repair of a HP 4195A network analyser

May 20, 2017 tobias Leave a comment

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 🙂

Continue reading Repair of a HP 4195A network analyser →

Measurement equipment

Repair of a HP 8753C network analyser

May 20, 2017 tobias Leave a comment

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.

Continue reading Repair of a HP 8753C network analyser →

Mathematics

Fractals with Matlab (or Octave)

May 16, 2017 tobias Leave a comment

Just for fun I tested whether it is possible to draw a fractal with Matlab. (Yes, it is, no big surprise 😉 )

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Mathematics, Study

Control of an inverse pendulum

May 16, 2017 tobias Leave a comment

This was a lab project during the bachelor’s in state-space control.

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Mathematics

Collection of formulae

May 16, 2017 tobias 2 Comments

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 →

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HB9FSX's useful and ugly pages

Recent Posts

  • Lumped element Wilkinson dividers
  • My new GPSDO
  • Lumped element quarterwave transformers
  • A waveguide bandpass filter
  • A homemade Ka band waveguide directional coupler

Recent Comments

  • Tom Miller on Repair of a HP 8568B spectrum analyzer
  • tobias on Cavity Oscillators
  • tobias on Master Thesis & some other RF stuff
  • Calvin Guan on Cavity Oscillators
  • Calvin Guan on HP 8341A repair part III

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