WAVEGUIDE BITS
Here is a few Waveguide bits and bobs to collect from Rallies...
The top left is a right joint with a round to square flange...
The top middle is what you would use to couple a rotationary dish to a fixed point or RADAR dish the center piece rotates continuously and is feed out at the back on a square flange..
The top right is a 3db coupler used to mix RF and the LO or to sniff off RF between the two waveguides....
The bottom left is an adjustable attenuator good down to -40/-60db with a vernier dial....
The rest are various connectors and flanges....Stuart G6NHG makes a few types....