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 →