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The 2-meter amateur radio band is a portion of the VHF radio spectrum that comprises frequencies stretching from 144 MHz to 148 MHz [1] in International Telecommunication Union region (ITU) Regions 2 (North and South America plus Hawaii) and 3 (Asia and Oceania) [2] [3] and from 144 MHz to 146 MHz in ITU Region 1 (Europe, Africa, and Russia).
Five 2.8 kHz-wide channels are available in the U.S., centered on 5.332, 5.348, 5.368, 5.373, and 5.405 MHz. Since most radios in SSB mode display the (suppressed) carrier frequency, in USB mode the dial frequencies would all need to be set 1.5 kHz lower. Voice operation is generally in upper sideband mode, which is mandatory in the U.S. . The ...
The UK government made it clear from the outset that legislation for use of this equipment would be unlikely. Interference problems associated with badly calibrated amplitude modulated (AM) or Single-Side-Band (SSB) equipment were cited as the main factor, [7] and it was made clear that if any system was legalised it would be frequency ...
The 27 MHz CB27/81 Bandplan is a list of the channel frequencies for FM CB radio in the United Kingdom. Unlike CB usage in the United States , and subsequently elsewhere in the world, the original UK 40 channels progress in order with 10 kHz spacing.
By the 1980s, amateur use of 2-meter and 70-centimeter bands was at an all-time high while activity on 1.25 meters remained stagnant. [ citation needed ] In an attempt to increase use on the band, many amateurs called for holders of Novice-class licenses (the entry-level class at that time) to be given voice privileges on the band.
CW / SSB / (AM: receive-only) Yes Xiegu 5105 [53] Commercial 160m – 6m 4.5 SSB / AM / FM Yes Xiegu G90 [54] Commercial 160m – 10m 20 CW / SSB / AM / (FM experimental with low sound quality) Yes Elecraft KX3 Kit or assembled 160 – 6 meter ham bands / wide band RX 0.1 – 10 CW / SSB / AM / FM / digital modes Yes Yaesu FT-818, Yaesu FT-817(ND)
The 2-meter band (144-148 MHz) lies within cable channel 18, but at 4 MHz wide, it is too narrow to fit the full 6 MHz bandwidth of an NTSC analog channel; its audio carrier lies outside the band. To be used as a television frequency, some narrow-bandwidth format incompatible with most televisions must be used and converted.
Most amateur digital modes are transmitted by inserting audio into the microphone input of a radio and using an analog scheme, such as amplitude modulation (AM), frequency modulation (FM), or single-sideband modulation (SSB). Amateur teleprinting over radio (AMTOR) D-STAR (Digital Data) a high speed (128 kbit/s), data-only mode.