Case in point: [dereksgc] is tearing apart a 20 GHz low-noise block (LNB). An LNB is a downconverter, and this one is used for some Irish satellite TV services. The scale of everything matters ...
Some designs (like the Itty Bitty) use a dual LNB to have both. If you are too lazy to build any hardware, you can still get into the radio telescope data crunching game. If you want an ...