Signal that has to be transmitted is impressed onto a carrier wave in any of the modulation methods, and it is then amplified and applied to the transmitting antenna. The modulated signal is radiated, propagated and collected by the receiving antenna .The signal at this point is generally quite weak, therefore the receiver must first amplify the received signals. Since the signal is quite likely to be complied by lots of other unwanted signals, probably at neighboring frequencies, it must be selected and the other rejected .Finally, since modulation took place in transmitter, the reverse process of this, demodulation, must be performed in the receiver to recover the original modulating voltages.

There are many similarities between radio frequency amplifiers and audio frequency amplifiers, but there are also many differences. Radio frequency amplifiers perform the same amplifying functions at radio frequencies as do audio frequency amplifiers at audio frequencies. Voltage and power amplifiers are used in both types of systems. But since the signal frequencies are very different, and radio frequency amplifiers require higher selectivity than audio frequency amplifiers, the radio frequency amplifiers normally make use of tuned circuits or selective filters to achieve the required selectivity.

To transmit radio waves we need Antennas. Although there are many different types of transmitting antennas available, the two principle categories are the half wave and quarter wave. Each has its own special characteristics.

How to fight back agains Telemarketers

My perspective on Bingo, why I like playing it and some bingo tips to help you.

You may have seen the list of the 10 weirdest things ever sold on on Ebay. That list is old and there have been weirder things sold since then. Here is my new and updated list of the weirdest things ever sold on Ebay, theres a couple from the old list cause there just that good.

You may have seen the list of the 10 weirdest things ever sold on on Ebay. That list is old and there have been weirder things sold since then. Here is my new and updated list of the weirdest things ever sold on Ebay, theres a couple from the old list cause there just that good.

Describes accidents on Mt Kilimanjaro.

Details of Kilimanjaro region's culture

The Cannes Film Festival is world famous, but close neighbor Monaco is getting in on the act with a festival of her own...

Check out all the weird, bizarre and funny items people are selling on Ebay.

An article about designing custom t-shirts. I will include suggestions for making them look great and keeping the cost of printing down.

If you browse the web, you'll come across many websites that has one or more video clips embedded in it. News websites such as BBC and CNN fall in this category. But, what about a website that has only video clips and nothing else? This is exactly what the Youtube Phenomenon is all about. To those who have not heard about Youtube, it is a video sharing website where one could upload, share, and watch video clips - Youtube videos - for free. It is owned by Google.

Morten St. George's theory that forty-two Nostradamus prophecies employ unique and powerful cryptographic techniques to convey future historical events and other types of information.