The aviation equivalent of Seelonce Mayday is the phrase or command "Stop Transmitting - Distress (or Mayday)". Once the need for radio silence is finished, the controlling station lifts radio silence by the prowords "Seelonce FINI." Disobeying a Seelonce Mayday order constitutes a serious criminal offence in most countries. (The word uses an approximation of the French pronunciation of the word silence, "See-LAWNCE."). In the latter case, the controlling station can order other stations to stop transmitting with the proword "Seelonce Seelonce Seelonce". Radio silence can be used in nautical and aeronautical communications to allow faint distress calls to be heard (see Mayday).
#RADIO SILENCE AFTER A BREAKUP MANUAL#
Main article: Maritime mobile service Radio room clock, showing the 500 kHz silence periods (red wedges), the 2182 kHz silence periods (green wedges), and alternating red and white bars around the circumference to aid manual transmission of the 4-second SOLAS signal. CQ like calls (to see who is out there) should not take place until after 4 minutes after the hour. Priority transmissions should begin with the LITZ (Long Interval Tone Zero or Long Time Zero) DTMF signal for at least 5 seconds. A ham in a remote location may be able to relay emergency information through another wilderness ham who has better access to a repeater. The Wilderness protocol (see page 101, August 1995 QST) calls for hams in the wilderness to announce their presence on, and to monitor, the national calling frequencies for five minutes beginning at the top of the hour, every three hours from 7 AM to 7 PM while in the back country. The Wilderness Protocol is now included in both the ARRL ARES Field Resources Manual and the ARES Emergency Resources Manual. The Wilderness Protocol recommends that those stations able to do so should monitor the primary (and secondary, if possible) frequency every three hours starting at 7 AM, local time, for 5 minutes starting at the top of every hour, or even continuously.
A single ship, aircraft, spacecraft, or group of them may also maintain radio silence. The term "radio station" may include anything capable of transmitting a radio signal. In telecommunications, radio silence or Emissions Control ( EMCON) is a status in which all fixed or mobile radio stations in an area are asked to stop transmitting for safety or security reasons.
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