ANNEX 10: RADIO MICROPHONE APPLICATIONS INCLUDING ASSISTIVE LISTENING DEVICES (ALD), WIRELESS AUDIO AND MULTIMEDIA STREAMING SYSTEMS

Scope of annex
This annex covers frequency bands and regulatory as well as informative parameters recommended for radio microphone applications (also referred to as wireless microphones or cordless microphones) including Assistive Listening Devices (ALD) (also referred to as aids for the hearing impaired). Radio microphones are small, low power (typically 50 mW or less) transmitters designed to be worn on the body, or hand held, for the transmission of sound. The receivers are tailored to specific uses and may range from small and portable to rack mounted modules as part of a multichannel system. This annex covers professional and consumer radio microphones, both hand-held and body-worn, in-ear monitoring, for use with concerts or other stage productions and Assistive Listening Devices (ALD). It also covers wireless audio and multimedia streaming systems used for audio/video transmissions and audio/video synchronisation signals including the following, cordless loudspeakers; cordless headphones; cordless headphones for portable use, cordless headphones for use in a vehicle, for example for use with a radio or mobile telephone. Band II Low Power Devices (LPD): short range low power FM transmitters operating in the FM Broadcast band 87.5 MHz to 108 MHz are used for the provision of an RF link between a personal audio device, including mobile phone, and the in-car or home entertainment system etc. Because of the difficulty in determining harmonised frequency bands for radio microphones, frequency band limits should be regarded as tuning ranges within which a device can be designated to operate. In most cases, Appendix 3 indicates those parts of the range that are not available in individual countries but this does not apply to the broadcasting bands at 174-216 MHz and 470-862 MHz where national geographical and licensing restrictions are likely to exist and the national administration should be contacted. The sub-bands below are intended for the following applications: - ALD: sub-bands b), c1), c2), d), g), h1), h2), h3), h4); - Radio microphones: sub-bands a), e), f1), f2), f3), f4), g), i1), i2), j1), j2), j3); - Wireless audio and multimedia streaming systems: sub-bands g), and j2); - Band II LPD: sub-band a1). ALD are specific radio microphone applications which capture an acoustic signal that is transmitted by radio to the hearing aid receivers.

Frequency Band Power / Magnetic Field Spectrum access and mitigation requirements Modulation / maximum occupied bandwidth ECC/ERC Deliverable Notes
a 29.7MHz  -  47MHz
10 mW e.r.p. No requirement ≤ 50 kHz Radio microphones. On a tuning range basis. The frequency bands 30.3-30.5 MHz, 32.15-32.45 MHz and 41.015-47.00 MHz are harmonised military bands. Individual licence may be required
a1 87.5MHz  -  108MHz
50 nW e.r.p. No requirement 200 kHz Band II LPD
c1 169.4MHz  -  169.475MHz
500 mW e.r.p. No requirement ≤ 50 kHz ECC/DEC/(05)02 Assistive Listening Device (ALD)
b 169.4MHz  -  174MHz
10 mW e.r.p. No requirement ≤ 50 kHz Assistive Listening Device (ALD). On a tuning range basis
c2 169.4875MHz  -  169.5875MHz
500 mW e.r.p. No requirement ≤ 50 kHz ECC/DEC/(05)02 Assistive Listening Device (ALD)
d 173.965MHz  -  216MHz
10 mW e.r.p. Notes 1 and 2 ≤ 50 kHz ECC Report 230 For Assistive Listening Device (ALD) systems. On a tuning range basis. Individual licence may be required
e 174MHz  -  216MHz
50 mW e.r.p. No requirement Not specified Radio microphones. On a tuning range basis. Individual licence may be required
f1 470MHz  -  786MHz
50 mW e.r.p. No requirement Not specified Radio microphones. On a tuning range basis. Individual licence may be required
f2 786MHz  -  789MHz
12 mW e.r.p. No requirement Not specified Radio microphones. On a tuning range basis. Individual licence may be required. See technical conditions for PMSE (including radio microphones) in Annex 3 of Decision ECC/DEC/(09)03 section 3.1
f3 823MHz  -  826MHz
20 mW e.i.r.p. / 100 mW e.i.r.p. No requirement ≤ 200 kHz Radio microphones. Individual licence may be required. 100 mW restricted to body worn equipment. See technical conditions for PMSE (including radio microphones) in Annex 3 of Decision ECC/DEC/(09)03 section 3.1
f4 826MHz  -  832MHz
100 mW e.i.r.p. No requirement ≤ 200 kHz Radio microphones. Individual licence may be required. See technical conditions for PMSE (including radio microphones) in Annex 3 of Decision ECC/DEC/(09)03 section 3.1
g 863MHz  -  865MHz
10 mW e.r.p. No requirement Not specified Radio microphones including wireless audio and multimedia streaming devices. The frequency band is also identified in annex 1
h1 916.1MHz  -  916.5MHz
10 mW e.r.p. ≤ 25 % duty cycle ≤ 400 kHz Indoor Digital Assistive Listening Device Systems. The frequency band is also identified in Annexes 1 and 11
h2 917.3MHz  -  917.7MHz
10 mW e.r.p. ≤ 25 % duty cycle ≤ 400 kHz Indoor Digital Assistive Listening Device Systems. The frequency band is also identified in Annexes 1 and 11
h3 918.5MHz  -  918.9MHz
10 mW e.r.p. ≤ 25 % duty cycle ≤ 400 kHz Indoor Digital Assistive Listening Device Systems. The frequency band is also identified in Annexes 1 and 11
h4 919.7MHz  -  920.1MHz
10 mW e.r.p. ≤ 25 % duty cycle ≤ 400 kHz Indoor Digital Assistive Listening Device Systems. The frequency band is also identified in Annexes 1 and 11
i1 1350MHz  -  1400MHz
20 mW e.i.r.p. / 50 mW e.i.r.p. No requirement/SSP (see notes column) Not specified Radio microphones. Individual licence may be required. 50 mW restricted to body worn equipment or equipment with Spectrum Scanning Procedure (SSP) implemented for the 1350-1400 MHz band
i2 1492MHz  -  1518MHz
50 mW e.i.r.p No requirement Not specified Radio microphones. On a tuning range basis. Individual licence required. Restricted to indoor use
j1 1785MHz  -  1795MHz
20 mW e.i.r.p. / 50 mW e.i.r.p. No requirement Not specified Radio microphones. Individual licence may be required. 50 mW restricted to body worn equipment or equipment with Spectrum Scanning Procedure (SSP) implemented for the 1785-1804.8 MHz band
j2 1795MHz  -  1800MHz
20 mW e.i.r.p. / 50 mW e.i.r.p. No requirement Not specified Radio microphones including wireless audio and multimedia streaming devices. Individual licence may be required. 50 mW restricted to body worn equipment or equipment with Spectrum Scanning Procedure (SSP) implemented for the 1785-1804.8 MHz band
j3 1800MHz  -  1804.8MHz
20 mW e.i.r.p. / 50 mW e.i.r.p. No requirement Not specified Radio microphones. Individual licence may be required 50 mW restricted to body worn equipment or equipment with Spectrum Scanning Procedure (SSP) implemented for the 1785-1804.8 MHz band

Note 1 A threshold of 35 dBµV/m is required to ensure the protection of a DAB receiver located at 1.5m from the ALD device, subject to DAB signal strength measurements taken around the ALD operating site.
Note 2 The ALD device should operate under all circumstances at least 300 kHz away from the channel edge of an occupied DAB channel.

Additional Information

Harmonised Standards
EN 300 422 all sub-bands except a1) EN 301 357 sub-bands a1), g) and j2) Systems using ETSI EN 301 357 should be designed so that when not in use there should be no transmission of an RF carrier, where indicated in the frequency issues.

Technical parameters also referred to in the harmonised standard
No information

Frequency issues
Sub-band a1): The user interface of SRD shall permit as a minimum the selection of any and all possible frequencies within the 88.1 MHz to 107.9 MHz and as a maximum 87.6 MHz to 107.9 MHz. When audio signals are not present, apparatus must employ a transmission time out facility. Pilot tones that ensure continuity of transmission are not permitted. Sub-band d): ECC Report 230 provides information on ALD frequency issues in the frequency band 174-216 MHz including an example for an on-site measurement procedure. It should be noted that ALD applications are a secondary, un-protected application and may need to move in frequency, if changes of the primary service take place. Sub-bands h1) to h4): The available channel centre frequencies are 916.3 MHz, 917.5 MHz, 918.7 MHz and 919.9 MHz. Use of all or part of sub-bands h1) to h4) may be denied in some European countries that use all or part of these sub-bands for defence/governmental systems or, in some countries that use sub-band 918-921 MHz for GSM for railways, extended band (ER-GSM). See Appendix 3 for national implementation concerning ER-GSM and defence/governmental services. Sub-bands f1) and f2): ECC/DEC/(15)01 identifies the band 703-733 MHz/758-788 MHz for the introduction of mobile/fixed communication networks (MFCN). Some national administrations which have not introduced mobile/fixed communication networks (MFCN) in accordance with Decision ECC/DEC/(15)01 may authorise larger parts or the whole of the band 694-790 MHz to be used by radio microphones. Sub-bands f2), f3), f4): Some national administrations which have not introduced mobile/fixed communication networks (MFCN) in accordance with Decision ECC/DEC/(09)03 may authorise larger parts or the whole of the band 786-862 MHz to be used by radio microphones. Sub-band i2): This frequency band is identified for the introduction of mobile/fixed communication networks (MFCN) in the future. National administrations may authorise radio microphones in the band as long as they will not have introduced mobile/fixed communication networks (MFCN).