Because it is not as well-known as it once was, it can also be used to convey secret messages, even in plain sight. An example of this can be found in aMorse code bracelet. This can be worn and have a special meaning to the wearer or their partner, which will be unknown to every...
In PWM, you simply turn the sine wave on and off. This is an easy way to send Morse code. PWM is not that common, but one good example of it is the radio system that sends signals toradio-controlled clocksin the United States.One PWM transmitteris able to cover the entire United St...
At the first stop, everything went smoothly. I put up my 31ft Jackite mast with the 30.5ft random wire going to a 9:1 LDG Unun and a 1:1 LDG choke. The coax then goes to a LDG AT-200Pro II tuner and my Yaesu FT-857D dialed down to 5W. This is my standard configuration w...
To decode RTTY signals you'll needa shortwave receiver with a BFO (Beat Frequency Oscillator), a way to pipe your radio's audio into your computer's sound card, and decoding software. There are several RTTY software packages out there, free, and my favorite is MMTTY. ...
Morse code. Unfortunately, it was also possible for anyone with the right equipment towiretapa line and listen in on exchanges. Moreover, most people had to rely on clerks to encode and decode messages, making it impossible to send plaintext clandestinely. Once again, ciphers became important....
The receiver receives the radio waves and decodes the message from the sine wave it receives. Both the transmitter and receiver use antennas to radiate and capture the radio signal. Simple Transmitters The battery sends electricity through a wire between its two terminals. The moving electrons ...
At its most basic, a barcode scanner is an optical scanner that uses light to copy coded data, decode it, and transmit it to a computer. The barcode was originally invented way back in 1948, on the sands of Miami Beach, no less. But it wasn’t until 20 years later when national gro...
Using the Huffman tree with the0/1convention generates binary codes that satisfy theprefix property. It ensures that the Huffman code of any specific character isn’t a prefix of any other character’s code, making it easy to decode the encoded string using the Huffman tree. This plays a pr...
The receiver receives the radio waves and decodes the message from the sine wave it receives. Both the transmitter and receiver use antennas to radiate and capture the radio signal. Simple Transmitters The battery sends electricity through a wire between its two terminals. The moving electrons ...
Encryption simply means that information isn't stored in a way that people or computer programs can easily read. It's in code, and to decode it, you need a decryption key. AES, short for Advanced Encryption Standard, is a particularly robust form of encryption that the US government...