From early in the 20th century, the radio frequency of 500 kilohertz (500 kHz) was an international calling and distress frequency for Morse code maritime...

2182 kHz is a radio frequency designed exclusively for distress calls and related calling operations in the maritime service. Transmissions on 2182 kHz commonly...

500 may refer to: 500 (number) 500 BC AD 500 500 Boylston Street in Boston 500 Brickell in Miami 500 Capitol Mall in Sacramento 500 Fifth Avenue 500 Renaissance...

which block the high frequency carrier waves (24–500 kHz) and let power frequency current (50–60 Hz) pass through. Wave traps are used in switchyard of...

computer, where it was first called the TMS9919 and later SN94624, and had a 500 kHz max clock input rate. Later, when it was sold outside of TI, it was renamed...

easily drift off frequency by 3–4 kHz. Since broadcast stations were assigned frequencies only 10 kHz (Americas) or 9 kHz (elsewhere) apart, interference...

frequency (MF) region, within the 415–526.5 kHz maritime band. With maritime traffic largely displaced from 500 kHz band, some countries had taken steps prior...

S.), maritime radio stations were required to observe radio silence on 500 kHz (radiotelegraph) for the three minutes between 15 and 18 minutes past the...

listen for priority signals, for 3 minutes, at different times for 500 kHz and 2182 kHz. Since many merchant vessels carried only one or two radio operators...

communication by international agreement. For much of the 20th century, 500 kHz was the primary international distress frequency. Its use has been phased...