Shortwave Receivers Past and Present PDF Download

Author: Fred Osterman
Publisher:
ISBN: 9781882123025
Category : Shortwave radio
Languages : en
Pages : 800

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Author: Robert A. Penfold
Publisher:
ISBN: 9780859342209
Category : Shortwave radio
Languages : en
Pages : 96

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The short wave receivers described in this book can all be built at low cost. All the sets are easy to construct, full wiring diagrams are provided, and they are suitable for complete beginners. The receivers only require simple aerials, and do not need any complex alignment or other difficult setting up procedures.

Author: Homer L. Davidson
Publisher: TAB/Electronics
ISBN: 9780830641901
Category : Radio
Languages : en
Pages : 0

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If you're a student or hobbyist who enjoys working with electronics, you'll love this project-packed book. It puts at your fingertips the hands-on guidance you need.

Author: R. A. Penfold
Publisher:
ISBN: 9780900162671
Category : Electronic apparatus and appliances
Languages : en
Pages : 117

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Author: Grayson Evans
Publisher: Lulu.com
ISBN: 1300965215
Category : Technology & Engineering
Languages : en
Pages : 289

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Discover (or rediscover) the fun and magic of building electronic circuits with thermatrons (vacuum tubes). This book has everything you need to know about the art and science of thermatron design and construction. It pulls together, in one easy to read book, thermatron types and characteristics, thermatron homebrew techniques, and how to design audio and RF triode and pentode circuits. The book is written primarily for radio amateurs (or audio equipment builders) that already understands basic electronics but have forgotten or never had the pleasure of working with hollow-state devices. The Second Edition includes over 50+ pages of new and revised material including a new chapter on thermatron oscillator design.

Author: Chuck Dachis
Publisher: Schiffer Book for Designers &
ISBN: 9780764308079
Category : Technology & Engineering
Languages : en
Pages : 0

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1000 photographs of Hallicrafters radio receivers, transmitters and speakers, early television sets, electronics accessories and advertising material produced by this Chicago-based firm. Technical descriptions are provided for every known Hallicrafters model, including dates of production, model numbers, accompanying pieces, and original prices.

Author: John Figliozzi
Publisher:
ISBN: 9780945053002
Category :
Languages : en
Pages : 168

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This new 10th edition of John Figliozzi's popular Worldwide Listening Guide explains radio listening in all of today's formats - "live," on-demand, WiFi, podcast, terrestrial, satellite, internet, digital and, of course, analog AM, FM and SW. The introductory section explains all the newest delivery methods for radio, and the devices used to access broadcasts from around the world at any time of day or night. Listening to programs from distant lands is no longer a late-night activity dependant upon shortwave propagation conditions. There is a whole other world of radio out there for your listening enjoyment. Thousands of radio stations worldwide use the Internet to stream their broadcasts. Traditional radio is being augmented by computers, laptops, tablets, smartphones, satellites, WiFi receivers and multiplexed digital transmission methods, greatly enhancing the listening experience.Use The Worldwide Listening Guide to join in the excitement of listening to worldwide radio, listening to news, information, music and entertainment from around the world broadcast in English. The Guide is organized to make it easy and convenient to find radio programs of interest to you. All program listings are provided two ways:First, programs are listed by UTC time, station, days of broadcast, the type of program, and their frequencies and web addresses.Second, special Classified Listings are provided to help listeners find programs of specific interest. The 37 classified program listings make it easy to find programs by topic or subject area.

Author: Ronald Paul Milione
Publisher:
ISBN:
Category :
Languages : en
Pages : 224

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ABOUT NUMBER STATIONSThere are actually several types of number stations, but the prototypical one is simply someone on the air reading lists of numbers (or sending them via Morse code). Some read off other coded messages (like phonetic alphabet letters) or have sounds in the background that may or may not be digitally-encoded messages. One even used a sound clip from a Yosemite Sam cartoon to separate bursts of data! According to the Conet Project, number stations were heard as early as World War I. In most cases, no one knows for sure what the purpose of the stations are, but there are dedicated groups that try to locate them and even decode what they are saying. However, it is thought that most of them use some form of one time pad cryptography which makes trying to decode them a very long shot. It is pretty widely accepted, though, that the purpose of most (if not all) of these stations is to deliver clandestine messages.For example, suppose I wanted to send you secret messages so I give you a shortwave receiver. I tell you to listen to a certain frequency at a certain time and I read off a series of numbers. To decode my message, you treat the numbers I read as a page number followed by a word number in, for example, a newspaper that is a day or two old. As long as you keep a copy of the newspaper and you have the radio, I can send you messages that would be very hard to decipher unless someone told you what newspaper we agreed to use. This is a form of one time pad, and if you keep the secrets, the method is practically unbreakable. The key, though, is that when they search your hotel room and find a shortwave receiver and a few days of newspapers, that's not particularly suspicious. There's a group called ENIGMA 2000 that catalogs and analyzes number stations, producing the Enigma Control List (although the latest one is a few years old). They have a naming scheme that identifies stations based on language or other characteristics of the signal. For example, stations starting with E broadcast in English, while stations starting with S broadcast in a Slavic language. M stations use Morse code. Naturally, these are just handy designations (like E22). In most cases, we don't know what the stations call themselves. In 1998, the FBI arrested five Cuban intelligence officers. The spies received messages via a numbers station (using Sony shortwave radios) and the coded messages were a big part of the FBI's court case. The FBI acquired the software the spies used to decode the messages and were able to read them (and present them in court). This may be the only time that a government has admitted that these stations are tied to covert operations.The Cuban Five, also known as the Miami Five (Gerardo Hernández, Antonio Guerrero, Ramón Labañino, Fernando González, and René González) were tried and convicted of conspiracy to commit espionage, conspiracy to commit murder, acting as an agent of a foreign government, and other charges.WHY NOW?Numbers Station.. You have to wonder, in this day of Internet and satellite phones, why these stations still operate. After all, a shortwave receiver is a bit more unusual today than it used to be. Maybe the receivers are camouflaged as standard radios and need some James Bond-style gadget to put them on the shortwave band. After all, a satellite phone implies you are talking to someone and Internet usage is traceable. Short of being caught in the act (or using software like the Cubans), there's no proof of what you are listening to on a radio. Still, it seems incredible that there are apparently still operatives somewhere right now copying encoded instructions from these number stations. You can only wonder what they are up to.HOW CAN I HEAR THEM?If you have a software defined radio setup, that's perfect. Of course, a general coverage receiver or a ham radio that has a wide receive range will do the trick too. An easy way to find common stations!

Author: Harry L. Helms
Publisher: Universal Radio Research
ISBN: 9781878707116
Category : Crafts & Hobbies
Languages : en
Pages : 323

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Book Description
Join the listeners of shortwave radio. This new edition of "Shortwave Listening Guidebook" is a ticket to the world in direct, non-technical language and helps in selecting the right shortwave radio, how reception conditions vary throughout the day and year, how to correctly operate the radio, and provides information on frequencies used by stations around the world.

Author: ANDREW BARRON
Publisher:
ISBN: 9781910193495
Category :
Languages : en
Pages :

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