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2. Wireless microphone - Wikipedia

   en.wikipedia.org/wiki/Wireless_microphone

   Almost all wireless microphone systems use wide band FM modulation, requiring approximately 200 kHz of bandwidth. Because of the relatively large bandwidth requirements, wireless microphone use is effectively restricted to VHF and above. Many older wireless microphone systems operate in the VHF part of the electromagnetic spectrum. Systems ...

3. Very high frequency - Wikipedia

   en.wikipedia.org/wiki/Very_high_frequency

   v. t. e. Very high frequency ( VHF) is the ITU designation [ 1] for the range of radio frequency electromagnetic waves ( radio waves) from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten meters to one meter. Frequencies immediately below VHF are denoted high frequency (HF), and the next higher frequencies are known as ultra ...

4. Wireless microphone licensing - Wikipedia

   en.wikipedia.org/wiki/Wireless_microphone_licensing

   In the UK, use of wireless microphone systems requires a Wireless Telegraphy Act license, except for the license free bands of 173.8–175.0 MHz and 863–865 MHz, sometimes referred to as "Channel 70" (not to be confused with TV Channel 69, which was 854–862 MHz and always required a license from JFMG Ltd [1] although licences are no longer ...

5. ISM radio band - Wikipedia

   en.wikipedia.org/wiki/ISM_radio_band

   Wireless network devices use wavebands as follows: IEEE 802.11/Wi-Fi 2450 MHz and 5800 MHz bands; Bluetooth 2450 MHz band [10] falls under WPAN; ANT / ANT+ (originates from Adaptive Network Topology) is a proprietary (but open access) multicast wireless sensor network technology designed and marketed by ANT Wireless. ANT devices may use any RF ...

6. Squelch - Wikipedia

   en.wikipedia.org/wiki/Squelch

   Squelch. Look up squelch in Wiktionary, the free dictionary. In telecommunications, squelch is a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a strong input signal. [ 1] Essentially, squelch is a specialized type of noise gate designed to suppress weak signals.

7. Title 47 CFR Part 15 - Wikipedia

   en.wikipedia.org/wiki/Title_47_CFR_Part_15

   Unlicensed broadcasts on the TV broadcast bands are prohibited, except for certain medical telemetry devices, wireless microphones, and other low power auxiliary stations. 87.5 to 88.0 MHz is considered part of the VHF TV low band. For TV, 15.241 and 15.242 deal with high VHF (channels 7 to 13), 15.242 also deals with UHF (band IV and band V).