Okay so I had a long time hosted my web page at Hoststar. Since a long time I am interested in self-hosting and now that I have glass fibre internet, I finally set up my full-blown home server and go completely self-hosted. For this reason I am migrating the old web page. More on this topic maybe later….
All posts by tobias
Restoration of a HP 4262A LCR Meter
I got a new 4262A LCR meter from eBay. It was sold ‘as is’ because it had a defect. Here I go into the repair procedure.
Continue reading Restoration of a HP 4262A LCR MeterMy first GPSDO project
I wanted to make my own GPSDO (GPS disciplined oscillator) to have accurate 10 MHz available. Here is my first attempt.
Continue reading My first GPSDO projectDesign of Diplexers
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? As I recently needed to make a small diplexer, I decided to make a little writeup of my process.
Because the ordinary bandpass filters have a 50 Ohms input impedance, it is not possible to directly connect two filters to the same source, because the input impedance of one filter would disturb the other filter.
Continue reading Design of DiplexersA Homemade GPS Antenna
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.
Continue reading A Homemade GPS AntennaRepair of a HP 8568B Spectrum Analyzer
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.
Continue reading Repair of a HP 8568B Spectrum AnalyzerHP 8341A Repair, Part 3
With the lab power supply, the YTO worked fine, so I did some further investigations on the 8341A’s YO loop.
Continue reading HP 8341A Repair, Part 3HP 8341A Repair, Part 2
Today, I decided to dismantle the YO loop of my HP 8341A to further search for the problem.
Continue reading HP 8341A Repair, Part 2HP 8341A Repair, Part 1
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….
Continue reading HP 8341A Repair, Part 1My “new” HP 8341A Signal Generator
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….
Continue reading My “new” HP 8341A Signal Generator