| |
|
Amateur Radio 6 m Band
|
In ITU Regions 2 and 3, this band is allocated on a primary basis to the amateur radio service. Several Region 1 countries have also adopted this band for amateur radio, but the band is formally allocated to the broadcasting service in that region. According to footnote 5.169 of the Radio Regulations, the Region 1 countries that have allocated 50-54 MHz to amateur radio are the following: Botswana, Burundi, Lesotho, Malawi, Namibia, the Dem. Rep. of the Congo, Rwanda, South Africa, Swaziland, Zambia and Zimbabwe.
According to the ITU, "this band is used for local communication at all times, including telecommand of objects such as models. Sky wave, tropospheric scatter and meteor burst propagation are used for distances up to 2000 km."
In the U.S., the ARRL has established the following band plan. The band plan may apply in other countries as well:
Frequency (MHz): Use
50.0 - 50.1: CW, beacons
50.060 - 50.080: Beacon subband
50.1 - 50.3: SSB, CW
50.10 - 50.125: DX window
50.125: SSB calling
50.3 - 50.6: All modes
50.6 - 50.8: Nonvoice communications
50.62: Digital (packet) calling
50.8 - 51.0: Radio remote control (20-kHz channels)
51.0 - 51.1: Pacific DX window
51.12 - 51.48: Repeater inputs (19 channels)
51.12 - 51.18: Digital repeater inputs
51.5 - 51.6: Simplex (six channels)
51.62 - 51.98: Repeater outputs (19 channels)
51.62 - 51.68: Digital repeater outputs
52.0 - 52.48: Repeater inputs (except as noted; 23 channels)
52.02, 52.04: FM simplex
52.2: TEST PAIR (input)
52.5 - 52.98: Repeater output (except as noted; 23 channels)
52.525: Primary FM simplex
52.54: Secondary FM simplex
52.7: TEST PAIR (output)
53.0 - 53.48: Repeater inputs (except as noted; 19 channels)
53.0: Remote base FM simplex
53.02: Simplex
53.1, 53.2, 53.3, 53.4: Radio remote control
53.5 - 53.98: Repeater outputs (except as noted; 19 channels)
53.5, 53.6, 53.7, 53.8: Radio remote control
53.52, 53.9: Simplex
|
Frequency Bands |
| Band | Use | Service | Table |
| 50 - 54 MHz | Amateur radio 6 m band | AM | N |
Display this entry in a page by itself
Edit
|
|
|
|
|
|
|
|
Access Broadband over Power Line (Access BPL)
|
According to the FCC's definition, Access BPL is "a carrier current system installed and operated on an electric utility service as an unintentional radiator that sends radio frequency energy on frequencies between 1.705 MHz and 80 MHz over medium voltage lines or over low voltage lines to provide broadband communications and is located on the supply side of the utility service’s points of interconnection with customer premises. Access BPL does not include power line carrier systems as defined in § 15.3(t) or In-House BPL as defined in § 15.3(gg)."
Low voltage lines are defined as lines carrying, for example, 240/120 volts from a distribution transformer to a customer's premises. Medium voltage lines carry between 1,000 and 40,000 volts from a power substation to neighborhoods, and may be overhead or underground.
Access BPL is an unlicensed service operated under Subpart G of Part 15 of the FCC's rules. Radiated emission limits from medium voltage lines in the 1.705-30 MHz range must not exceed the limits in 47 CFR 15.209, and those from 30-80 MHz must not exceed the limits in 15.109(b). Systems that operate on low voltage lines must comply with 15.109(a) limits across the entire 1.705-80 MHz range.
When Access BPL systems must use notch filters to protect licensed services, the notch must be at least 25 dB below applicable Part 15 limits in the 1.705-30 MHz band, and at least 10 dB below the limits in the 30-80 MHz band.
There are 12 sub-bands in which Access BPL systems are not allowed to operate anywhere to protect aeronautical (land) stations and aircraft receivers. Those excluded bands are listed in 15.615(f), and are excluded in the list of Access BPL bands in this entry.
Access BPL systems are not allowed to operate within the sub-band 2173.5-2190.5 kHz within 1 km of coast station facilities listed in 47 CFR 15.615(f)(2)(i), to protect the internationally-recognized standard maritime calling frequency of 2182 kHz.
No Access BPL emissions are allowed in the 73.0-74.6 MHz radio astronomy band on overhead medium voltage lines within 65 km of the Very Large Array radio telescope in New Mexico (34 04 43.5N, 107 37 03.82W), or within 47 km of the VLA on underground power lines or overhead low voltage lines.
Access BPL operators must consult at least 30 days in advance when deploying systems near various FCC field offices, aeronautical and maritime stations, radar systems, radio astronomy stations, and research areas. Details are in 47 CFR 15.615(f)(3).
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|