Wireless World War


While many of our visitors might be interested by some of my own posts, heres one i discovered whilst looking around edu blogs.com that is much better written than I might ever hope to reach. Maybe someday I will get to their level, you never know.

As with so many emerging technologies, it was warfare that helped propel walkie-talkies from prototype to mass adoption in a short time. During World War II, the U.S. and Allied forces were the first to put these newfangled radios into widespread use.

There were several groups working on this type of radio in the late 1930s, so it’s impossible to attribute the exact genesis of the walkie-talkie to one person or company. Radio engineer Al Gross and Canadian inventor Donald Hings were on the forefront of this technological wave, as were research groups at Gavin Manufacturing Company, which is now better known as Motorola.

Just before 1940, Motorola produced a portable AM transceiver that became known as a handie talkie. This was an AM-based system (on frequencies from 3 to 6 MHz). It worked, but it was prone to degrading signal quality, meaning static and interference often made communication frustrating.

The first design to hit the battlefield in mass numbers, and the first to garner the walkie-talkie label, was the Motorola SCR-300. The SCR-300 was also an FM-based device (40 to 48 MHz), and much more resistant to interference than AM. It also had better range, at around 3 to 5 miles (4.8 to 8 kilometers).

FM-based radio signals offered the advantage of squelch, which just meant that the speaker went silent until an incoming signal arrived. Prior to squelch capabilities, radio operators who monitored AM signals had to endure long periods of mind- and ear-numbing static when no one was transmitting on the channel that they were monitoring.

The SCR-300 wasn’t exactly as convenient as your average pocket-sized smartphone. It required a backpack that housed the battery, electronics and a 33-inch (84-centimeter) antenna, all of which totaled more than 30 pounds (13.6 kilograms). Try dodging Nazi bullets and bombs with that load on your back.

In spite of its heft, the unit was rugged and reliable in war zones, and tens of thousands of them were deployed to troops in both the Pacific and European theaters. The end result was forces that could communicate and coordinate their activities much more effectively than ever before.

After WWII, walkie-talkie technology hit the mainstream. Military versions got smaller, lighter and more powerful. Amateur radio lovers adopted walkie-talkies en masse. Consumer-grade versions appeared, too, with affordable price tags that made them perfect for basic communications around the house, in the field, and even as toys.

No matter what purpose you use them for, walkie-talkies all work pretty much the same

Porterville’s Radio Hams provides emergency demo to public


The world is stuffed with very awesome, well written posts. Whenever you find one that catches your eye, you have got to repost it, well i do! so with authorization of the original writer i have re-posted this to benefit from
The Porterville Amateur Repeater Association will be demonstrating Amateur Radio from 11 a.m. to 5 p.m. on Saturday, June 28, at Veterans Park.
Despite the Internet, cell phones, email and modern communications, every year whole regions find themselves in the dark. Tornadoes, fires, storms, ice and even the occasional cutting of fiber optic cables, leave people without the means to communicate. In these cases, the one consistent service that has never failed has been Amateur Radio. These radio operators, often called hams provide backup communications for everything from the American Red Cross to FEMA and even the International Space Station. Portervilles hams will join with thousands of other Amateur Radio operators showing their emergency capabilities.
We will be running off of emergency generators, said Glenn Ricketson of Porterville Radio Hams about the demonstration. While this is primarily in the United States, it is worldwide. The event is to show the public what ham radio is about about; show the difference between ham and CBs.
Over the past year, the news has been full of reports of ham radio operators providing critical communications during unexpected emergencies in towns across America including the California wildfires, winter storms, tornadoes and other events worldwide. When trouble is brewing, Amateur Radios people are often the first to provide rescuers with critical information and communications.
On June 28, the public will have a chance to meet and talk with Portervilles Walkie talkie operators and see for themselves what the Amateur Radio Service is about as hams across the USA will be holding public demonstrations of emergency communications abilities.
This annual event, called Field Day, is the climax of the week long Amateur Radio Week sponsored by the ARRL, the national association for Amateur Radio. Using only emergency power supplies, ham operators will construct emergency stations in parks, shopping malls, schools and backyards around the country. Their slogan, When all else fails, Walkie talkie works, is more than just words to the hams as they prove they can send messages in many forms without the use of phone systems, Internet or any other infrastructure that can be compromised in a crisis. More than 35,000 amateur radio operators across the country participated in last years event.
The fastest way to turn a crisis into a total disaster is to lose communications, said Eddie Orosco, president of PARA. From the earthquake and tsunami in Japan to tornadoes in Missouri, ham radio provided the most reliable communication networks in the first critical hours of the events. Because ham radios are not dependent of the Internet, cell towers or other infrastructure, they work when nothing else is available. We need nothing between us but air.
For more information about Amateur Radio, visitwww.emergency-radio.org.