Types of radios

What exists, and what each is best at.

HF transceiversWhat to look for in a base-station rig.Handheld transceiversVHF/UHF HTs and their limits.VHF/UHF mobile and base radiosHigher power and better antennas than an HT.QRP and portable radiosSmall, low-power rigs for the field.SDR transceiversSoftware-defined radios as full stations.Receivers, scanners and SDR donglesListening-only gear.Repeaters and controllersThe hardware behind a repeater.Hotspots and gatewaysPersonal digital-voice nodes.Vintage and tube radiosBoat anchors and restoration.