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Design of diplexers

February 6, 2018 tobias 2 Comments

When I wanted to build a diplexer, I read that this can be done by using a highpass anda lowpass filter. But what if someone wants to make a multiplexer, or if one wants to use bandpass filters?

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RF stuff

A homebrew GPS antenna

January 31, 2018 tobias Leave a comment

My next project is to build a GPS disciplined oscillator. I have bought a NEO6M GPS module (GY-GPS6MV2) which uses an active antenna. However, there are several drawbacks which I want to fix first.

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Measurement equipment

8753C Network Analyser Options & Firmware

January 25, 2018 tobias 5 Comments

My HP 8753C network analyser has options 010 and 006 installed, with 006 being the 6 GHz operation and 010 being time domain analysis. However, there is also option 002, which is called harmonic analysis.

UPDATE: I made a firmware dump & updated to the latest version!

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Measurement equipment

Repair of a HP 8568B spectrum analyzer

October 28, 2017 tobias 2 Comments

I got a ‘new’ spectrum analyzer, which is a HP 8568B (100 Hz – 1.5 GHz). Unfortunately, it has some problems with the CRT, as well as some noisy traces.

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Measurement equipment

HP 8341A repair part III

October 13, 2017 tobias 1 Comment

With the lab power supply, the YTO worked fine, so I did some further investigations on the 8341A’s YO loop…

UPDATE: power flatness test!

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Measurement equipment

HP 8341A repair part II

October 11, 2017 tobias Leave a comment

Today, I decided to dismantle the YO loop of my HP 8341A to further search for the problem.

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Measurement equipment

HP 8341A repair part I

October 8, 2017 tobias Leave a comment

So, the HP 8341A which I recently got has several problems. Besides a bad YTO, it also has a burnt relay on the A62 motherboard. When fixing the generator, I decided to start with the easy things….

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Measurement equipment

My new HP 8341A signal generator

October 4, 2017 tobias Leave a comment

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….

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RF stuff

Design of a coaxial cavity filter

September 15, 2017 tobias Leave a comment

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.

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Study

Master Thesis & some other RF stuff

September 13, 2017 tobias 2 Comments

Here you can find my Master’s Thesis  😀 Have fun reading.

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