The Radio Amateur's Hand Book A Complete, Authentic and Informative Work on Wireless Telegraphy and Telephony

In the chapters on _Receptors_ you have been told how to build up high-grade sets. But there are thousands of boys, and, probably, not a few men, who cannot afford to invest $25...

In the first part of this book we learned about spark-gap telegraph sets and how the oscillations they set up are _damped_ and the waves they send out are _periodic_. In this an...

A wireless telegraph transmitting set can be installed for a very small amount of money provided you are content with one that has a limited range. Larger and better instruments...

The three foregoing chapters explained in detail the design and construction of (1) two kinds of C. W. telegraph transmitters, and (2) two kinds of wireless telephone transmitte...

In time past the most difficult of all electrical apparatus for the amateur to make, install and work was the wireless telephone. This was because it required a _direct current_...

From the foregoing chapters you have seen that the vacuum tube can be used either as a _detector_ or an _amplifier_ or as a _generator_ of electric oscillations, as in the case...

As inferred in the first chapter, an aerial for receiving does not have to be nearly as well made or put up as one for sending. But this does not mean that you can slipshod the...

It is easy to understand how electricity behaves and what it does if you get the right idea of it at the start. In the first place, if you will think of electricity as being a f...

With a crystal detector receiving set you can receive either telegraphic dots and dashes or telephonic speech and music. You can buy a receiving set already assembled or you can...

While a vacuum tube detector has an amplifying action of its own, and this accounts for its great sensitiveness, its amplifying action can be further increased to an enormous ex...

In writing this book it is taken for granted that you are: _first_, one of the several hundred thousand persons in the United States who are interested in wireless telegraphy an...

The easiest way to get a clear conception of how a wireless transmitter sends out electric waves and how a wireless receptor receives them is to take each one separately and fol...

Wireless Headphones.--A telephone receiver for a wireless receiving set is made exactly on the same principle as an ordinary Bell telephone receiver. The only difference between...

Though the vacuum tube detector requires two batteries to operate it and the receiving circuits are somewhat more complicated than where a crystal detector is used still the for...

All receiving sets that receive over a range of wave lengths of from 150 meters to 3,000 meters are called _intermediate wave sets_ and all sets that receive wave lengths over a...

A _short wave receiving set_ is one that will receive a range of wave lengths of from 150 to 600 meters while the distance over which the waves can be received as well as the in...

There is a strikingly close resemblance between _sound waves_ and the way they are set up in _the air_ by a mechanically vibrating body, such as a steel spring or a tuning fork,...

The Vacuum Tube Amplifier.--This consists of a three electrode vacuum tube exactly like the vacuum tube detector described in Chapter VIII and pictured in Fig. 38, except that i...

Within the last few years alternating current has largely taken the place of direct current for light, heat and power purposes in and around towns and cities and if you have alt...

Any of the receiving sets described in the foregoing chapters will respond to either: (1) a wireless telegraph transmitter that uses a spark gap and which sends out periodic ele...

The reason a vacuum tube detector is more sensitive than a crystal detector is because while the latter merely _rectifies_ the oscillating current that surges in the receiving c...

While you can receive dots and dashes from spark wireless telegraph stations and hear spoken words and music from wireless telephone stations with a crystal detector receiving s...