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.
I tested my GPSDO by comparing it with my Oscilloquartz STAR4.
After I decided to make a waveguide coupler to see what results I may achieve, I have disassembled one and looked at its construction. Then I made my own coupler.
Continue reading A homemade Ka band waveguide directional coupler
As I said, after I made my own waveguide termination, I wanted to make a directional coupler in waveguide. Here is my progress.
I want to do a few experiments with waveguides, this time I try to make a termination. Later I will try to make a directional coupler, so with the aid of the termination I can calibrate the directional coupler and do some measurements at higher frequencies.
I got a new 4262A LCR meter from eBay. It was sold ‘as is’ because it had a defect…
I was working quite a while on my GPSDO project. This post is still work in progress and I will provide some updates from time to time 😉
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?
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.
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.