These used several valves (tubes) to provide RF amplification, detection, and audio amplification. Tuned radio frequency sets (TRF sets) were the most popular class of early radio, primarily because the Radio Corporation of America (RCA) had a monopoly on the superheterodyne circuit patents and it was more profitable for companies to jump into radio manufacturing TRF sets. Some crystal set users added a carbon amplifier or a mechanical turntable amplifier to give enough output to operate a speaker. Crystal sets had minimal ability to separate stations, and where more than one high power station was present, inability to receive one without the other was a common problem. They were popular among the less wealthy due to their low build cost and zero run cost. They would receive only very strong signals from a local station. These basic radios used no battery, had no amplification and could operate only high-impedance headphones.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |