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A single complete frame of time code begins at the start of each minute, lasts one minute, and conveys the year, day of year, hour, minute, and other information as of the beginning of the minute. WWVB is co-located with WWV, a time signal station that broadcasts in both voice and time code on multiple shortwave radio frequencies.
Minute Duration Signal :00:30: 07:55: Unmodulated carrier :08:38: 01:00: Transmitter off :09:39: 00:55: Morse code station identification: "RWM RWM RWM..." :10:40: 09:55: 1 Hz pulses. Minute pulse 500 ms, others 100 ms, doubled with DUT1 code. :20:50: 09:55: 10 Hz pulses, 20 ms each. 40 ms on the second, 500 ms on the minute.
Both the Amateur Extra Class' 20 words-per-minute (WPM); and General and Advanced classes' 13 WPM Morse code tests, were removed in favor of a standardized 5 WPM as the sole Morse code requirement for both the General and Extra Class licenses.
The RDS logo. Radio Data System ( RDS) is a communications protocol standard for embedding small amounts of digital information in conventional FM radio broadcasts. RDS standardizes several types of information transmitted, including time, station identification and program information.
BPC time code, sent every 20 seconds on the minute Second MSbit LSbit Meaning Second MSbit LSbit Meaning 00 — Start of time code No signal gap 10: 12 P1: Hour (0=AM 1=PM) Even parity over 01–09 01: 40 20: Second (00, 20 or 40) 11: 0: Unused 16: Day of month (01–31) 02: 0 0: Unused 12: 8 4 03: 8 4: Hour (00–11) 13: 2 1 04: 2 1: 14: 8 4 ...
WWV BCD time code Bit Weight Meaning Ex Bit Weight Meaning Ex Bit Weight Meaning Ex :00: No 100 Hz (minute mark) :20: 1: Hours Example: 21: 1 :40: 100: Day of year (cont.) 0 :01: 0: Unused, always 0. 0 :21: 2: 0 :41: 200: 0 :02: DST1: DST status at 00:00Z today Example: No DST at 00:00Z: 0 :22: 4: 0 :42: 0: Unused, always 0. 0 :03: LSW: Leap ...
The unit also features a removable button facepanel as an additional anti-theft measure. Many car audio systems (car radios) have a so-called 'radio code' number which needs to be entered after a power disconnection. This was introduced as a measure to deter theft of these devices. If the code is entered correctly, the radio is activated for use.
R-S-T system. For other uses, see RST (disambiguation). S-Meter (ICOM IC-732 HF Transceiver) The R-S-T system is used by amateur radio operators, shortwave listeners, and other radio hobbyists to exchange information about the quality of a radio signal being received. The code is a three digit number, with one digit each for conveying an ...
If the local time is desired instead of UTC, substitute the time zone code "JULIETT" for "ZULU". Instead of providing time checks on an individual basis, the NCS should give advance notice of a time check by stating, for example, "TIME CHECK AT 0900 JULIETT", giving all stations sufficient time to prepare their clocks and watches for adjustment.
The dynamotor took from 1/10 to 1/4 of a second to "spin up" to full power. Police officers were trained to push the microphone button, then pause briefly before speaking; however, sometimes they would forget to wait. Preceding each code with "ten-" gave the radio transmitter time to reach full power.