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 2S_1/2 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.

2182 kHz

The radio frequency 2 182 kHz is one of the international calling and distress frequency for maritime radiocommunication on a frequency band allocated to the MOBILE SERVICE on primary basis, exclusively for distress and calling operations.

Transmission modes

Transmissions on 2182 kHz commonly use single-sideband modulation (SSB) (upper sideband only). However, amplitude modulation (AM) and some variants such as vestigial sideband are still in use, mainly by vessels with older equipment and by some coastal stations in an attempt to ensure compatibility with older and less sophisticated receivers.

Range

2182 kHz is analogous to channel 16 on the marine VHF band, but unlike VHF which is limited to ranges of about 20 to 50 nautical miles (40 to 90 km) depending on antenna height, communications on 2182 kHz and nearby frequencies have a reliable range of around 50 to 150 nautical miles (90 to 280 km) during the day and 150 to 300 nautical miles (280 to 560 km) or sometimes more at night. The reception range of even a well-equipped station can be severely limited in summer because of static caused by lightning.

Open (Blues Image album)

Open is Blues Image's second album and most acclaimed album, which featured the No. 4 hit single, "Ride Captain Ride".

Critical reception

Robert Christgau, writing in The Village Voice, wrote in a contemporary review: "Great single, mediocre (though improved) album. Do we really need another 'Parchman Farm?'"

Track listing

All songs by Blues Image except where noted.

Personnel

References

Open (Gotthard album)

Open is the fourth studio album released by the hard rock band Gotthard.

The album peaked at #1 on the Swiss Charts and was certified as 2x Platinum for exceeding 60,000 sales.

Track listing

All songs written by Steve Lee/Leo Leoni/Chris von Rohr except where noted.

Asian version (BMG AVCB-66072) adds the following

Personnel

Guests:

Open (sport)

An Open in sports terminology refers to a sporting event or game tournament that is open to contestants regardless of their professional or amateur status, age, ability, gender, sex, or other categorization. In many sports, preliminary qualifying events, open to all entrants, are held to successively reduce the field to a manageable number for participation in a final championship event, which itself may involve elimination rounds.

The term 'Open' may not be absolute. For example, in the U.S. Open in golf, entrants at qualifying events must have a USGA official handicap of 1.4 or less. Other minimum performance standards or eligibility criteria may apply in other sports.

Opens are usually found in golf, tennis, badminton, quizbowl, fighting games, snooker, darts, volleyball, ultimate, squash and chess.