Home > Spectrum > Information for Radiocomms Licences > Radiocommunications Licence Information > Types of Radio Use > Amateur Radio > Notices > Special Research Permits

17|02|09

Update - Special Research Permits (501 to 504 kHz band)

Following representations made by the Radio Society of Great Britain and negotiations by Ofcom with the Maritime and Coastguard Agency, Ofcom has decided to extend the period of Notices of Variation (NoVs) for operation in the 501 to 504 kHz band until 28 February 2010. Additionally, the maximum effective radiated power (e.r.p.) limit has been increased to 10 dBW (10 W). Existing NoVs are due to expire at the end of February 2009.

Compared with experimental access granted for 5 MHz, the number of NoVs issued has been very small, but the percentage usage high, with approximately 70% of those holding NoVs having transmitted in the band. Of the remainder some are known to be still constructing suitable equipment, some experiencing difficulty with local noise problems and others are possibly put off by the reports of limitations in coverage on account of the e.r.p. restriction.

The current e.r.p. level limits the coverage area, particularly for those operating in an urban or business noise environment. Some NoV holders have ceased experimentation due to the lack of activity.

There have been no reports of interference and investigation shows that an increase of radiated power to 10 dBW is not likely to cause interference. Moreover, NoV holders are only permitted to operate subject to causing no interference.

Special Research Permits under a Notice of Variation to the Licence are made available to holders of Full Amateur Licences on a case by case basis to applicants who can demonstrate a genuine interest in experimentation at these frequencies and provide adequate supporting documentation for assessment.

Due to the usage of the spectrum around the 500 kHz bands, applicants should pay special attention to demonstrating technical and operational competence in terms of transmitting within the frequency band and Effective Radiated Power (e.r.p.) parameters agreed with Ofcom. Previous experience at 73 kHz as well as 136 kHz will be considered desirable in this respect to ensure adequate steps are taken to limit any potential interference.

Ofcom will monitor any interference reports and also consider limiting numbers if necessary in reviewing operation in the band. On no account will an e.r.p. level of greater than 10 dBW be permitted under any circumstance.

The standard application form (OfW306) for a Special Research Permit can be downloaded at: http://www.ofcom.org.uk/radiocomms/ifi/licensing/classes/amateur/applications/ofw306.pdf

A new NoV will automatically be issued to existing NoV holders; new applications are not required.

Should a new NoV not be required or if you are in possession of an NoV which is not required, please inform the Ofcom Licensing Centre stating your name, call sign and Licence number preferably by e-mail to licensingcentre@ofcom.org.uk or alternatively by post to the address at the end of the text.

Form OfW306 is also available on request from the Ofcom Licensing Centre at:

Ofcom Licensing Centre
Amateur Radio
Riverside House
2a Southwark Bridge Road
London SE1 9HA

Tel: 020 7981 3131

Back to top