Editing Low frequency (section)

===Experimental and amateur===
The 2007&nbsp;[[World Radiocommunication Conference]] (WRC-07) made a worldwide amateur radio allocation in this band. An international 2.1&nbsp;kHz allocation, the [[2200-meter band|{{nobr|{{gaps|2|200}} meter band}}]] (135.7–137.9&nbsp;kHz) is available to [[amateur radio]] operators in several countries in Europe,<ref>
{{cite report
 |title=ERC {{nobr|Recommendation 62-01 E}}
 |year=1997
 |section=Use of the band 135.7–137.8&nbsp;kHz by the Amateur Service
 |id={{nobr|ERC Rec 62-01 E}}
 |publisher=[[European Conference of Postal and Telecommunications Administrations]] (CEPT)
 |place=Mainz, DE
}}
</ref>
New Zealand, Canada, US,<ref name=ARRL-bandchart>
{{cite AV media
 |title   = Regulatory Band Chart
 |date    = 2017-09-22
 |edition = 11×17″ color
 |medium  = chart / graphic
 |publisher = [[American Radio Relay League]]
 |place   = Newington, CT
 |url     = http://www.arrl.org/files/file/Regulatory/Band%20Chart/Band%20Chart%20-%2011X17%20Color.pdf
 |access-date  = 2020-11-26 |url-status=live
 |archive-url  = https://web.archive.org/web/20201111222535/http://www.arrl.org/files/file/Regulatory/Band%20Chart/Band%20Chart%20-%2011X17%20Color.pdf
 |archive-date = 2020-11-11  |df = dmy-all
}}
</ref>
and French overseas dependencies.

The world record distance for a two-way contact is over 10,000&nbsp;km from near [[Vladivostok]] to [[New Zealand]].<ref name=ZLUA0>
{{cite news
 |title = QSO ZL / UA0 on 136&nbsp;kHz
 |department = The World of LF
 |website = wireless.org.uk
 |url = http://www.wireless.org.uk/newspic92.htm
 |access-date = 2006-06-01   |url-status=live
 |archive-url = https://web.archive.org/web/20070929025210/http://www.wireless.org.uk/newspic92.htm
 |archive-date = 2007-09-29
}}
</ref>
As well as conventional [[Morse code]] many operators use very slow computer-controlled Morse code (so-called [[QRP operation#QRSS|"QRSS"]]) or specialized digital communications modes.

The UK allocated a 2.8&nbsp;kHz sliver of spectrum from 71.6&nbsp;kHz to 74.4&nbsp;kHz beginning in April&nbsp;1996 to UK amateurs who applied for a Notice of Variation to use the band on a noninterference basis with a maximum output power of 1&nbsp;Watt&nbsp;[[effective radiated power|ERP]]. This was withdrawn on 30&nbsp;June 2003 after a number of extensions in favor of the cross-European standard 136&nbsp;kHz band.<ref name=ofcom>
{{cite press release
 |title=UK Spectrum Strategy 2002
 |date=16 September 2016
 |publisher=[[Ofcom]]
 |url=http://www.ofcom.org.uk/static/archive/ra/topics/spectrum-strat/future/strat02/strategy02app_a.doc
 |access-date=5 June 2006 |url-status=live
 |archive-url=https://web.archive.org/web/20070930031406/http://www.ofcom.org.uk/static/archive/ra/topics/spectrum-strat/future/strat02/strategy02app_a.doc
 |archive-date=30 September 2007
}}
</ref>
Very slow Morse Code from G3AQC in the UK was received {{convert|3275|mi|km}} away, across the [[Atlantic Ocean]], by W1TAG in the US on 21-22&nbsp;November 2001 on 72.401&nbsp;kHz.{{efn|
Low-frequency experimenter Lawrence "Laurie" Mayhead, G3AQC, has added another LF accomplishment to his list – trans-Atlantic reception of his 73&nbsp;kHz signal. [...] Mayhead reports that on the night of 21-22&nbsp;November, his signal on 72.401&nbsp;kHz was received in the US. "I managed to transmit a full call sign to John Andrews, W1TAG, in Holden, Massachusetts", he said. Mayhead was using dual-frequency CW – or DFCW – featuring elements that are two minutes long; Andrews detected his signal using ARGO {{nobr|DSP software. — [[ARRL]] Nov 2001<ref>
{{cite news
 |title      = G3AQC's signal spans the Atlantic on 73&nbsp;kHz!
 |date       = 30 November 2001
 |periodical = The ARRL Letter
 |publisher  = [[American Radio Relay League]]
 |place      = Newington, CT
 |url = http://www.arrl.org/arrlletter?issue=2001-11-30
 |access-date = 12 January 2014  |url-status = live
 |archive-url=https://web.archive.org/web/20140112215834/http://www.arrl.org/arrlletter?issue=2001-11-30
 |archive-date=12 January 2014
}}
</ref>}}
}}

In the United States, there is an exemption within FCC Part&nbsp;15 regulations permitting unlicensed transmissions in the frequency range of 160–190&nbsp;kHz. Longwave radio hobbyists refer to this as the '[[LowFER]]' band, and experimenters, and their transmitters are called '[[LowFER]]s'. This frequency range between 160&nbsp;kHz and 190&nbsp;kHz is also referred to as the {{nobr|{{gaps|1|750}} meter}} band. Requirements<ref>
{{cite report
 |title = Part&nbsp;15 — Radio frequency devices
 |section = § 15.217 Operation in the band 160–190 kHz ({{nobr|47 CFR 15.217}})
 |series = The Electronic Code of Federal Regulations
 |website = ecfr.gov
 |id = {{nobr|47 CFR 15.217}} ({{nobr|47 CFR 15.206}})
 |url = http://www.ecfr.gov/cgi-bin/text-idx?SID=ea364b89f317550d594a9315deca6022&mc=true&node=pt47.1.15&rgn=div5#se47.1.15_1209
 | access-date = 17 March 2024
}}{{failed verification |date=March 2024}} Cited section {{nobr|47 CFR 15.206}} not present / removed: section id §15.205 skips to §15.207&nbsp;.
</ref> include:
* The total input power to the final radio frequency stage (exclusive of filament or heater power) shall not exceed one watt.
* The total length of the transmission line, antenna, and ground lead (if used) shall not exceed 15 meters.
* All emissions below 160&nbsp;kHz or above 190&nbsp;kHz shall be attenuated at least 20&nbsp;dB below the level of the unmodulated carrier.
* As an alternative to these requirements, a field strength of 2400/F(kHz)&nbsp;microvolts/meter (measured at a distance of 300 meters) may be used (as described in 47CFR15.209).
* In all cases, operation may not cause harmful interference to licensed services.
Many experimenters in this band are amateur radio operators.<ref>
{{cite web
 |title = Part&nbsp;15 — Rado frequency devices
 |series = Federal Register 
 |url = http://www.ecfr.gov/cgi-bin/text-idx?SID=7f66d50bc733c74f45ff68ec5dda7d93&node=47:1.0.1.1.16&rgn=div5#47:1.0.1.1.16.3
 |access-date=2014-07-21  |url-status=live
 |archive-url=https://web.archive.org/web/20140726053324/http://www.ecfr.gov/cgi-bin/text-idx?SID=7f66d50bc733c74f45ff68ec5dda7d93&node=47:1.0.1.1.16&rgn=div5#47:1.0.1.1.16.3
 |archive-date=2014-07-26
}}
</ref>