Sunday, June 27, 2010
Friday, June 25, 2010
Thursday, June 24, 2010
Welcome to HobbySpace. the site that will prove to you that everyone can participate in space exploration and development in one way or another.
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Tuesday, June 22, 2010
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Monday, June 21, 2010
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Thursday, June 17, 2010
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Tuesday, June 15, 2010
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Friday, June 11, 2010
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Wednesday, June 9, 2010
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Friday, June 4, 2010
The original military walkie talkie was a breakthrough for its day, because it meant that any soldier could pick it up and use it, and unlike other military radios, this one could be carried easily. The batteries were built-in, and the telescopic antenna could easily be collapsed for transport. So it was very quick to get the radio set going, and it could be operated just about anywhere – even while a soldier was walking. And that’s where the nickname ‘walkie talkie’ came into being.
That first handheld US Army walkie talkie had only one channel, and despite its chunky size and low power transmission strength, it was powered by valves – as all radio equipment was back in those days. The transistor had already been discovered back then but wouldn’t go into production for several more years.
By the 1960s transistors were becoming commonplace and simple silicon chips were coming into use as well. This was a perfect time to introduce walkie talkie CB radios to the American public. These low-powered CB radios were licensed by the FCC as Part-15 radio appliances.
These 27 MHz walkie talkie two way radios were limited to a few hundred milliwatts of power, and by law they could only have a small antenna. This meant they could only be used over short distances, but they proved to be very popular nonetheless.
For the first time, these small cheap 27 Mhz handheld CB radio transceivers could be carried by campers, hunters, fishermen and other sportsmen and hobbyists.
Soon they would be replaced by VHF and even UHF two-way radios, which also worked mostly line-of-sight but had an FM signal for better sound clarity. FM became the normal mode for business radios and for police and public service band radios in mobile, base and handheld walkie talkies as well.
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Thursday, June 3, 2010
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ABOUT AMATEUR RADIO
AMATEUR RADIO OPERATOR'S CERTIFICATE
Regulation 15(2) of the regulation denotes that a person who contravenes this regulation commits an offence and shall, on conviction, be liable to a fine not exceeding three hundred thousand ringgit (RM 300,000.00) or to imprisonment for a term of not exceeding three years or to both.
To eliminate the potential of interferences, the following procedures must be followed strictly:-
a) Ensure that suffient equipment, tools and test gear is available and can used to monitor and verify that your transmission does not cause any interference to other radio services.
b) You must responsible if your amateur radio is found to be the caused of interference. Immediate remedy action must be taken to rectify the problems in case of interference.
c) Ensure that the transmission do not exceed the level of over deviation.
d) Ensure that the radiated energy is always within the narrowest posible frequency bands for any class of emission in use.
e) The radiation of harmonics and spurious emissions should be suppressed to minimize interference.