- (Radio's Youth: pre-1915)
- (Radio's Maturity: 1915-1929)
- (Period Peripheral Wireless Subjects)
- (Useful post-1929 Handbooks)
This historical FREE documents archive focuses on the applied technology of Wireless (radio, television, radio-control, etc.), from its beginnings through 1929 (when it can be claimed that wireless had achieved maturity). It is not about transmissions (broadcasts) that may have used the technology!
Earlier books lean more towards theory and reporting about experiments, while later books lean more towards being practical application guides. Wireless articles in magazines before 1920 were often only inclusions in technical electrical and mechanical focused publications, while after 1920 they mostly appeared in magazines dedicated exclusively to consumer radio broadcast reception. There is a sharp division between how wireless sets were designed before and after the Great War, as well as a noticeable shift in focus during the 1920s away from
The vast majority of the circuits presented in these articles can be built today, either as drawn, or with straight-forward substitutions of modern component equivalents (including in some cases, solid-state equivalents). It is surprising how many of the old wireless techniques have been forgotten, even though they often provide elegant or higher-fidelity solutions that could be incorporated into modern analog or hybrid digital equipment.
Because most of this material even predates the type of equipment that collectors are familiar with, it is hoped that persons will build at least one of these pioneering circuits, if for no other reason than to increase their understanding of how we got to where we are today with radio. In the US, there are no peacetime restrictions against anyone building radio receivers for personal use. Anyone may also build a personal use transmitter if its maximum output power falls below the FCC part-15 limits. Higher power transmitter construction requires that the builder hold at least an amateur radio or a general radiotelephone operators license. Note that both Spark and Arc transmitters (just like any other transmitter design) are legal to both build and operate, as long as their emissions are kept within the FCC parameters for the frequency at which they are operating.
Because several books and articles written during this time period reference the "Aether", it is extremely useful to know something about it = The History of the Aether Theory .pdf