I have not posted for a long time! Not only because I was too busy in the meantime, but also because I was working on a quite involved project: a new GPSDO!
Continue reading My new GPSDO
I always wanted a HP 8970B noise figure meter to measure the noise figure of some amplifiers etc. However, these usually go for stiff prices, but recently I found an unit on eBay which was quite cheap.
Continue reading My new HP 8970B noise figure meter
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!
Continue reading 8753C Network Analyser Options & Firmware
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 analyzer
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!
Continue reading HP 8341A repair part III
Today, I decided to dismantle the YO loop of my HP 8341A to further search for the problem.
Continue reading HP 8341A repair part II
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 I
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
I recently decided to calibrate my HP 4195A network/spectrum analyser. While I had the device open, I also dumped the firmware (28 EPROMS!)
Continue reading HP 4195A firmware dump
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