1955 Israel HOMEBREW RADIO BUILDING Jewish GUIDE BOOK Model AMATEUR Hebrew FAX

Description

DESCRIPTION
:
Here for sale is a richly illustrated HEBREW BOOK regarding HOMEBREW ,RADIO , AMATEUR RADIO , RADIO BUILDING , TELEPHONE and even a quite primitive version of FAX MACHINE . Building and USING for the ISRAELI YOUTH which was published in Tel Aviv ERETZ ISRAEL almost 60 years ago in 1955. It's an ORIGINAL Hebrew written book , Not a translation or adaptaion of a foreign RADIO book .
Named " The Young Radio User and Builder - A Guide to Amateur Radio, Electricity,  Electronics "
. Original HC
. Gilt headings . 5.5 x 8.5" .  54 throughout illustrated pp . Good condition.
Nicely preserved ex library copy with a few stamps. A few tears in bottom of spine. Otherwise very clean .( Please look at scan for actual AS IS images )  . Book will be sent protected inside a protective packaging
.
PAYMENTS
:
Payment method accepted : Paypal .
SHIPPMENT
:
SHIPP worldwide via registered airmail is $ 25 . Book will be sent inside a protective packaging .
Handling around 5 days after payment.
Amateur radio (also called ham radio) is the use of designated
radio frequency
spectra
for purposes of private recreation,
non-commercial
exchange of messages,
wireless
experimentation, self-training, and emergency communication. The term "amateur" is used to specify persons interested in radio technique solely with a personal aim and without direct pecuniary interest, and to differentiate it from
commercial broadcasting
, public safety (such as police and fire), or professional
two-way radio
services (such as maritime, aviation, taxis, etc.). The amateur radio service (
amateur service
and
amateur satellite service
) is established by the
International Telecommunication Union
(ITU) through the International Telecommunication Regulations. National governments regulate technical and operational characteristics of transmissions and issue individual stations licenses with an identifying
call sign
. Prospective amateur operators are tested for their understanding of key concepts in electronics and the host government's radio regulations. Radio amateurs use a variety of voice, text, image, and data communications modes and have access to frequency allocations throughout the
RF spectrum
to enable communication across a city, region, country, continent, the world, or even into space. Amateur radio is officially represented and coordinated by the
(IARU), which is organized in three regions and has as its members the national amateur radio societies which exist in most countries. According to an estimate made in 2011 by the  , two million people throughout the world are regularly involved with amateur radio.
About 830,000 amateur radio stations are located in IARU Region 2 (the Americas) followed by IARU Region 3 (South and East Asia and the Pacific Ocean) with about 750,000 stations. A significantly smaller number, about 400,000, are located in IARU Region 1 (Europe, Middle East, CIS, Africa). Homebrew is an
Amateur radio
slang term for home-built, noncommercial radio equipment. Design and construction of equipment from first principles is valued by amateur radio hobbyists for educational value, and to allow experimentation and development of techniques or levels of performance not readily available as commercial products. Some items can be home-brewed at similar or lower cost than purchased equivalents. In the early years of amateur radio, long before factory-built gear was easily available, hams built their own transmitting and receiving equipment, known as homebrewing. In the 1930s, 40s, and 50s, hams handcrafted reasonable-quality
vacuum tube
-based transmitters and receivers which were often housed in their basements, and it was common for a well-built "homebrew rig" to cover all the
high frequency
bands (1.8 to 30 MHz). After WWII ended, surplus material (transmiters/receivers, etc.), was readily available, providing previously unavailable material at costs low enough for amateur experimental use. Homebrewing was often encouraged by amateur radio publications. In 1950,
CQ Amateur Radio
Magazine announced a ‘‘00 Cash Prize ‘Home Brew’ Contest’’ and called independently-built equipment ‘‘the type of gear which has helped to make amateur radio our greatest reservoir of technical proficiency.’’ The magazine tried to steer hams back into building by sponsoring such competitions and by publishing more construction plans, saying that homebrewing imparted a powerful technical mastery to hams. In 1958, a
CQ
editorial opined that if ham radio lost status as a technical activity, it might also lose the privilege of operating on the public airwaves, saying, ‘‘As our ranks of home constructors thin we also fall to a lower technical level as a group’’. In the 1950s and 60s, some hams turned to constructing their stations from kits sold by
Heathkit
,
Eico
EF Johnson
,
Allied Radio's Knight-Kit
,
World Radio Laboratories
and other suppliers. Today, only a minority of hams own and operate completely homebrew or kit-built amateur stations. However, there are many new ham radio kit suppliers, and the "art" of homebrewing is alive and thriving.
Practices
Homebrewing differs from kit-building in that "homebrew" connotes the process of constructing equipment using parts and designs gathered from varied and often improvised sources. Even the most skilled homebrewer may not have time or resources to build the equivalent of modern commercially-made amateur radio gear from scratch, as the commercial units contain custom integrated circuits, custom cabinets, and are the end result of multiple prototypes and exhaustive testing. However, constructing one's own equipment using relatively simple designs and easily-obtainable or
junk box
electronic components is still possible. Homebrew enthusiasts say that building one's own radio equipment is fun and gives them the satisfaction that comes from mastering electronic knowledge.
QRP homebrew
QRPers
are ham radio enthusiasts known to use a power output of five watts, sometimes operating with as little as 100 milliwatts or even less. Extremely low power -- 1 watt and below -- is often referred to by hobbyists as QRP. Commercial transceivers designed to operate at or near QRP power levels have been available for many years, but some QRPers prefer to design and build their own equipment, either from kits or from scratch. Many build miniature transmitters and transceivers into
Altoids
boxes and operate using battery power. Popular QRP kit models include the Elecraft K2, KX1, and now KX3  and those produced by NorCal, Small Wonder Labs, and others. QRP activity can often be heard on 7.030 MHz.
Homebrewing with vacuum tubes
"Glowbug" is a term used by US amateurs to describe a simple home-made tube-type radio set, reminiscent of the shortwave radio-building craze of the 1920s and 30s. "Glow" refers to the glow of the vacuum tubes and "bug" to the gear's relatively diminutive size. Generally, any small, home-built tube-type transmitter or receiver may be referred to as a glowbug. The majority of glowbug transmitters are designed to be used in the
CW
radiotelegraphy
mode. A number of radio amateurs also build their own tube receivers and AM voice transmitters. As late as the 1960s, glowbugs were part of many beginner ham stations, and the
ARRL
Radio Amateur Handbook for those years exhibited a number of such simple, tube-based designs. Today, glowbugs are enjoying a resurgence of interest among
QRP
enthusiasts and others with a penchant for constructing their own equipment. A growing number of hams are "getting back to their roots" by assembling glowbugs on steel chassis, tin cakepans, and wooden boards. Glowbug enthusiasts can often be heard communicating on the shortwave bands via CW using
Morse code
. A popular frequency to hear glowbug contacts is 3.57950 MHz. Simple oscillators for this frequency can be built with common NTSC
color burst
oscillator crystals, which operate at 3.579545 MHz.     ebay2085