This dramatic event, counted as Seleucus' first regal year, was continued as the Seleucid Era, the first continuous count of time in world chronology, soon to inspire the similar Arsacid Era of Parthia. There is also the residual uncertainty about Hellenistic dating. Bickerman, for instance, positively asserted that Seleucus reconquered Babylon "in August of " [Chronology of the Ancient World, Cornell University Press,p.
The enjoyment of seeing your own creation work —or even if it fails- always surpasses being a mere user of corporate products. The joys of making and modifying things for themselves run deep in the ham community. Hams were the original Makers and Hackers, using new, used and scavenged parts to make transmitters, receivers, and antennas capable of communicating with other hams anywhere on Earth, and beyond.
In this hobby, communicating is the keyword. And, when computers came along, they fit right in to the ham's wide world. Using their technical skills and imagination, hams put together advanced communication networks connected by radio waves instead of wires.
From microchips and robotics to time and space itself, the Makers within the Amateur Radio ranks build and explore new ways to play with the radio spectrum such as bouncing UHF signals off a meteorite trail or sending email without the Internet — just for fun. They can contact astronaut hams on the International Space Station or set world distance records for communications using microwaves.
Hams are even developing whole new systems where a computer IS the radio. When two transmitters and two or more receivers are used, two simultaneous data streams can be sent, which double the data rate.
Multiple receivers alone allow greater distances between devices. That attitude is completely understandable; antennas are just not that interesting to most people. To some, including myself, RF propagation and antenna technology are very worthy discussion topics.
I still remember the excitement of talking to as many fellow amateurs as I could on an old home built CW transmitter. Not having a great deal of money for new equipment, I focused on improving my antenna farm. It did not take long for me to notice the difference a good antenna made.
Poorly designed or poorly built antennas—I learned the hard way—can literally destroy transmitter RF circuits. Whereas a well built antenna afforded me the opportunity to communicate with other amateurs anywhere in the world.
Antenna systems finally get some respect Wireless equipment manufacturers will always have the challenge of trying to equal or surpass the capabilities of wired voice or data networks. Helping to close that gap are recent innovations using multiple—same frequency—antenna systems.
Researchers and equipment manufacturers now understand that using MIMO antenna technology means greater receiver gain, increased data rates, larger network throughput, and improved reliability through antenna diversity.
Posted on April 10, by apitts Download a new radio?
Yes, we do that! Since the beginning of radio itself, signals arrived at antennas and were processed by bits of hardware so that the information they carried could be understood by human beings.
A century ago, the hardware amounted to little more than crystals and coils of wire. Vacuum tubes followed, which were eventually superceded by transistors and integrated circuits.The Middle Ages Society can be studied under three sub-groups, the Early Middle Ages, High Middle Ages, and Late Middle Ages.
After the collapse of Roman Empire, the society of The Middle Ages continued to suffer barbarian invasions as they occupied the .
+ free ebooks online. Did you know that you can help us produce ebooks by proof-reading just one page a day? Go to: Distributed Proofreaders. At the start of the Middle Ages, England was a part of Britannia, a former province of the Roman timberdesignmag.com local economy had once been dominated by imperial Roman spending on a large military establishment, which in turn helped to support a complex network of towns, roads, and villas.
At the end of the 4th century, however, Roman forces had been largely withdrawn, and this economy collapsed. Foreword by Joseph H. Peterson. This interesting grimoire was published by S.L.
Mathers in , and a second edition was published in by J.M. Watkins, timberdesignmag.comer Crowley also considered it of great importance and underwent the operation described. p. 1. SECRET SOCIETIES OF THE MIDDLE AGES. INTRODUCTION. IF we had the means of investigating historically the origin of Secret Societies, we should probably find that they began to be formed almost as soon as any knowledge had been accumulated by particular individuals beyond what constituted the common stock.
The History of science is the study of the development of science and scientific knowledge, including both the natural and social sciences.
(The history of the arts and humanities is termed history of scholarship.) Science is a body of empirical, theoretical, and practical knowledge about the natural world, produced by scientists who emphasize the observation, explanation, and prediction of.