That six-character code hams trade during contacts, like DM43 or EM12ab, is a Maidenhead grid square, a compact way of encoding location that shows up everywhere from VHF contests to satellite passes.
A spurious emission is any signal your transmitter puts out that it should not. Here is what causes them, why they matter, and how to keep your signal clean.
Your antenna does not have to be anywhere near you for you to use it. Remote operation lets you run your home HF station from a laptop on a business trip, or from across town. Here is how the pieces fit together.