Hertz
The hertz (symbol Hz) is the unit of frequency in the International System of Units (SI) and is defined as one cycle per second. It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.
One of the unit's most common uses is in the description of sine waves and musical tones, particularly those used in radio and other audio-related applications. It is also used to describe the speeds at which computers and other electronics are driven.
Definition
The hertz is equivalent to cycles per second. In defining the second, the International Committee for Weights and Measures declared that "the standard to be employed is the transition between the hyperfine levels F = 4, M = 0 and F = 3, M = 0 of the ground state 2S1/2 of the cesium 133 atom, unperturbed by external fields, and that the frequency of this transition is assigned the value 9 192 631 770 hertz" thereby effectively defining the hertz and the second simultaneously.
107.9 FM
The following radio stations broadcast on FM frequency 107.9 MHz:
Australia
Canada (Channel 300)
Mexico
2-meter band
The 2-meter amateur radio band is a portion of the VHF radio spectrum, comprising frequencies stretching from 144 MHz to 148 MHz in International Telecommunication Union region (ITU) Regions 2 (North and South America plus Hawaii) and 3 (Asia and Oceania) and from 144 MHz to 146 MHz in ITU Region 1 (Europe, Africa, and Russia). The license privileges of amateur radio operators include the use of frequencies within this band for telecommunication, usually conducted locally within a range of about 100 miles (160 km).
Amateur radio
Operation
Because it is local and reliable, and because the licensing requirements to transmit on the 2-meter band are easy to meet in many parts of the world, this band is one of the most popular non-HF ham bands. This popularity, the compact size of needed radios and antennas, and this band's ability to provide easy reliable local communications also means that it is also the most used band for local emergency communications efforts, such as providing communications between Red Cross shelters and local authorities. In the US, that role in emergency communications is furthered by the fact that most amateur-radio operators have a 2-meter handheld transceiver (HT), handie-talkie or walkie-talkie.
Retroactive (film)
Retroactive is a 1997 adventure science fiction action film directed by Louis Morneau.
Plot
Karen hitches a ride in Frank's car after hers breaks down. The violent Frank is travelling with his abused wife, on his way to sell stolen computer chips. Following a discussion, he suspects his wife is being unfaithful, leading to violence and a tragic series of events. Karen escapes, reaching a lab where a scientist has invented a time machine, and she returns by accident some minutes before the violent events. She tries to make things better, but instead makes things worse. Each time she goes back in time to interfere, she causes a worse outcome than before. Eventually Karen uses the machine to go back as far as it can take her and refuse Frank's offer of a ride in the first place. Without her interference, Frank is killed by his wife.
Cast
Retroactive (album)
Retroactive is the fourth album by Grand Puba. It was released on September 6, 2009.
Track listing
Samples
Chart positions
Album chart positions
Singles chart positions
References
Podcasts:
