Bøker av Jeff Crawford

This book concentrates on the design, construction, and alignment of kilowatt-level filters intended for use in the High Frequency range. Typical applications are in amateur radio where two transmitters operate in tandem, a mode called SO2R - Single Operator Two Radio. The technical design details are applicable, however, to HF high power design in general. Many of the design methods are applicable to much higher frequencies as well, the difference being how the filter elements are realized at the particular frequency. The specifics of filter building blocks are addressed with attention given to those quantities important to high power operation. Most importantly, the text outlines multiple circuit methods, termed transforms, which make construction of these filters possible using much less expensive MLCCs - multi-layer ceramic chip capacitors. Two complete design examples are included, one for 40m and the other for 15m. This book comes in four different formats: B&W soft, hard, and Color soft, hard. Select "See All Formats". The color versions use higher quality paper that significantly improves the readability of all text and equations, as well as figures and pictures. Two-thirds of the book is for the advanced amateur interested in DIY high power design. The final third of the book is relegated to the more advanced topics which, in most cases, require higher level mathematics or an engineering background.

What if in an instant you lost everything you valued? What if in an instant the ability to simply see was taken from you? What if in an instant the person you needed to lean on the most in the midst of all that was assaulting you was suddenly gone? This and more was what Marley had faced everyday for more than two years. At the end of her rope, when she had all but finally tired of fighting the good fight things changed. Some for the better and some that threatened what was left of her resolve and her sanity, if not more. But the question that had to be answered was, would the small bright spots be enough and would they be in time.

In the swamps of central Florida during the late 1800's the residents were much as they were everywhere else, there were good people, bad people and worse than bad; but they all had one thing in common, they were all going to die at some point. Something watched and waited for one of these deaths to occur. This would not be a normal death because this was not an average run of the mill human, this was Leander Timms and he had been called to a higher purpose. The Maxwell family were the worse than bad alluded to earlier with the exception being the youngest of the family, a girl child named Trudy. Trudy had among others, the misfortune of falling in love and being loved by Leander Timms. Their feelings for each other started a series of events in motion that had been foreseen for perhaps centuries. All men must face their maker when the shadows of this life finally close in around them, but not everyone takes the same path to that inevitable moment.