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Ten-codes, officially known as ten signals, are brevity codes used to represent common phrases in voice communication, particularly by law enforcement and in citizens band (CB) radio transmissions. The police version of ten-codes is officially known as the APCO Project 14 Aural Brevity Code. [1]
Specific frequency allocations vary from country to country and between ITU regions as specified in the current ITU HF frequency allocations for amateur radio. [1] The list of frequency ranges is called a band allocation, which may be set by international agreements, and national regulations.
The 10-meter band is a portion of the shortwave radio spectrum internationally allocated to amateur radio and amateur satellite use on a primary basis. The band consists of frequencies stretching from 28.000 to 29.700 MHz.
Two PRN ranging codes are transmitted on L5 in quadrature: the in-phase code (called I5-code) and the quadrature-phase code (called Q5-code). Both codes are 10,230 chips long, transmitted at 10.23 Mchip/s (1 ms repetition period), and are generated identically (differing only in initial states).
Low frequency: LF: 5: 30–300 kHz 10–1 km: Navigation, time signals, AM longwave broadcasting (Europe and parts of Asia), RFID, amateur radio. Medium frequency: MF: 6: 300–3,000 kHz 1,000–100 m
List of HTTP status codes - Wikipediawikipedia.org
Illegal operations may unintentionally end up on frequencies very much in use. For instance, channel 19 shifted two bands up is 28.085 MHz, which is in a Morse code / data-only part of the 10 meter ham band. Voice transmissions in a Morse code-only segment are easily detectable by authorities.
GMRS/FRS radios offering CTCSS codes typically provide a choice of 38 tones, but the tone number and the tone frequencies used may vary from one manufacturer to another (or even within product lines of one manufacturer) and should not be assumed to be consistent (i.e. "Tone 12" in one set of radios may not be "Tone 12" in another).
frequency (MHz) Frequency range (MHz) 10 MHz 20 MHz Band name United States United Kingdom Europe Japan 172 5860 5855–5865 10 — DSRC: Unknown Yes Unknown 174 5870 5865–5875 10 176 5880 5875–5885 10 178 5890 5885–5895 10 180 5900 5895–5905 10 182 5910 5905–5915 10 C-V2X: No No No Registration required 183 (proposed) 5915 5905 ...
10 −12: 1 picohertz (pHz) 1.23 pHz Precession of the Earth's axis (about every 25,700 years) 10 −11: 10 pHz ~31.71 pHz: Once per millennium 10 −10: 100 pHz ~317.1 pHz: Once per century 10 −9: 1 nanohertz (nHz) ~1 nHz: Once per generation (about every 30 years) ~2.9 nHz: Average solar cycle (about every 11 years) ~3.171 nHz: Once per ...
10–1 km: Low frequency: LF — 300 kHz – 3 MHz 1 km – 100 m: Medium frequency: MF — 3–30 MHz 100–10 m: High frequency: HF: HF: 30–300 MHz 10–1 m: Very high frequency: VHF: VHF: 300 MHz – 3 GHz 1 m – 100 mm: Ultra high frequency: UHF: UHF, L, S: 3–30 GHz 100–10 mm: Super high frequency: SHF: S, C, X, Ku, K, Ka: 30–300 ...