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Using the codes eases coordination and improves understanding during multiservice operations. The codes are intended for use by air, ground, sea, and space operations personnel at the tactical level. Code words that are followed by an asterisk (*) may differ in meaning from NATO usage. There is a key provided below to describe what personnel ...
For this reason, NASA permitted the three-man crews to name both crafts for each of their missions, and these names were used as the call signs. A temporary exception to this was on the first Moon landing, Apollo 11 : since the first Moon landing site was in the Sea of Tranquillity , the call sign Tranquillity Base was used while the LM was on ...
Unless a clandestine station has a strong cover identity, the larger the station, the larger the possibility it may be detected by counterintelligence organizations. Beyond the station chief, the most likely person to be associated with the station, not as a case officer, is a communicator, especially if highly specialized secure communication ...
A numbers station is an example of a one-way voice link, often broadcasting to a field agent who may already know the intended meaning of the code, or use a one-time pad to decode. These numbers stations will continue to broadcast gibberish or random messages according to their usual schedule; this is done to expend the resources of one's ...
Overview diagram of COSPAS-SARSAT communication system used to detect and locate ELTs, EPIRBs, and PLBs First generation EPIRB emergency locator beacons. An emergency position-indicating radiobeacon (EPIRB) is a type of emergency locator beacon for commercial and recreational boats, a portable, battery-powered radio transmitter used in emergencies to locate boaters in distress and in need of ...
A typical VHF survival craft transceiver. Very high frequency (VHF) survival craft transceivers (SCTs) are lightweight, portable, two-way, handheld VHF transceivers capable of radiotelephone on-scene communication between rescue units and the survival craft. Essentially these are hand-held VHF radios that are used in any survival craft, such as ...
The use of weapons has been a major driver of cultural evolution and human history up to today since weapons are a type of tool that is used to dominate and subdue autonomous agents such as animals and, by doing so, allow for an expansion of the cultural niche, while simultaneously other weapon users (i.e., agents such as humans, groups, and cultures) are able to adapt to the weapons of ...
The VOR station transmits two audio signals on a VHF carrier – one is Morse code at 1020 Hz to identify the station, the other is a continuous 9960 Hz audio modulated at 30 Hz, with the 0-degree referenced to magnetic north. This signal is rotated mechanically or electrically at 30 Hz, which appears as a 30 Hz AM signal added to the previous ...