Die physikalischen Grundlagen der Radiotechnik by Wilhelm Spreen

Posted by

By Wilhelm Spreen

Show description

Read Online or Download Die physikalischen Grundlagen der Radiotechnik PDF

Best radio books

Ham Radio's Technical Culture (Inside Technology)

Decades sooner than the web, ham radio supplied on the spot, international, person-to-person verbal exchange. millions of beginner radio operators--a predominantly male, heart- and upper-class crew referred to as "hams"--built and operated two-way radios for sport in mid 20th century the USA. In Ham Radio's Technical tradition, Kristen Haring examines why such a lot of males followed the technical pastime of ham radio from the Nineteen Thirties via Nineteen Seventies and the way the hobby helped them shape identification and group. Ham radio required solitary tinkering with subtle electronics gear, usually remoted from family actions in a "radio shack," but the pastime thrived on fraternal interplay. Conversations at the air grew into friendships, and hams amassed in golf equipment or met informally for "eyeball contacts. " inside this neighborhood, hobbyists built particular values and practices with reference to radio, making a specific "technical tradition. " Outsiders seen beginner radio operators with a mix of awe and suspicion, inspired through hams' mastery of robust expertise yet uneasy approximately their touch with foreigners, in particular during times of political pressure. Drawing on a wealth of non-public bills present in radio magazines and newsletters and from technical manuals, exchange journals, and govt records, Haring describes how ham radio tradition rippled via hobbyists' lives. She explains why hi-tech employers recruited hams and why electronics brands catered to those forte buyers. She discusses hams' place in the army and civil safety in the course of global conflict II and the chilly battle in addition to the influence of the pastime on family members dynamics. by way of contemplating ham radio within the context of alternative technical hobbies--model construction, images, high-fidelity audio, and related rest pursuits--Haring highlights the shared reports of technical hobbyists. She indicates that tinkerers prompted attitudes towards know-how past pastime groups, enriching the final technical tradition by means of posing a necessary counterpoint.

Reporting War: Journalism in Wartime

Reporting battle explores the social tasks of the journalist during periods of army clash. information media remedies of foreign crises, in particular the single underway in Iraq, are more and more turning into the topic of public controversy, and dialogue is urgently wanted. every one of this book's members demanding situations well-known assumptions approximately conflict reporting from a particular standpoint.

Reading Radio 4: A Programme-by-Programme Analysis of Britain's Most Important Radio Station

This publication is a examine of up to date Radio four output, masking the full broadcast day. Radio is basically overlooked through media and cultural reviews. The small physique of present paintings on Radio four is predominantly ancient, concentrating on institutional heritage, or sociological, concentrating on modern BBC editorial and journalistic practices.

Additional info for Die physikalischen Grundlagen der Radiotechnik

Example text

M( 1 - cos ~)J m2 . 2nt T r- 1'i

I: -- 10000 (220 L osung. 20 - 20) -_ looOOOOh m. Beispiel: Ein Voltmeter, dessen MeBbereich 0 bis 10 Volt ist, solI 44 DaB Ohmsche Gesetz. auf den IOfachen Bereich (0-100 Volt) gebracht werden. Der Widerstand des Instruments betragt 456 Ohm. Wieviel Ohm sind vorzuschalten? Losung: 9·456 Ohm = 4104 Ohm, so daB jetzt der Widerstand des Instruments 4560 Ohm ist. Es mag hier noch erwahnt werden, daB man auch den Me Bbereich eines Amperemeters belie big erweitern kann. Will man den MeBbereich auf das 10fache bringen, so darf man nur 1/10 des zu messenden Stromes durch das Instrument gehen lassen, muB also 9/10 an ihm vorbeileiten.

B) 10 Std. = 10·60· 60 Sekunden = 36000 Sek. Die Arbeitin der Sekunde betragt nach a) 44 W attse kunden = 44 Joule, also ist A = 44 . 36000 Joule = 1584000 Joule. :~~~ = 0,44 Kilowattstunden, da Kilowattstunde. Die Unkosten betragen 0,44 . 0,45 M. = 0,20M. 3. Das magnetische Feld. Man entdeckte diese Kraft zuerst in einigen Eisenerzen und iibertrug sie von diesen auf das Eisen selbst. Ein wesentlicher Unterschied zwischen den beiden Erscheinungsgebieten der Elektrizitat und des Magnetismus ist der, daB es Karper gibt, die die Elektrizitat leiten, wahrend der Magnetismus immer an die Materie gebunden und nur mit dieser beweglich ist.

Download PDF sample

Rated 4.41 of 5 – based on 4 votes