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7. Key Terms

On this page you can find frequently asked Key Terms:



Very High Frequency - covers the radio frequency spectrum from 30M Hz to 300 MHz and is used mostly for TV broadcasting and FM radio.


Ultra High Frequency - covers the radio frequency spectrum from 300 Mhz to 3 GHz and is used mostly for TV and mobile phone services.


All radio systems are susceptible to interference, and in extreme cases the signal can cut out altogether. To avoid the likelihood of this, ‘diversity’ receivers use two aerials spaced a distance apart. The signal received on each aerial is compared by the receiver, and the system automatically uses whichever is the stronger. As it’s unlikely that both aerials will ever experience drop out simultaneously, the resultant signal is very stable. (Diversity receivers do not require diversity transmitters – the aerials are merely picking up two different versions of the same signal due to their physical separation in space.) Systems with only one aerial are known as ‘non diversity’ - these should only be used when your budget is tight and the operating range of the system will be short.


This refers to problems of interaction with other electronic equipment. There are three common types of interference - electrical interference, radio frequency interference or ‘RFI’, and intermodulation (see below). Electrical interference can be caused by any electrical device, for instance computers, lighting and domestic products such as hi-fis and ‘white goods’. RFI is caused by radio, TV and other equipment that generates radio frequency energy in its normal operation. Well designed radio mic systems will avoid all types interference, but the cheapest may not!


This is a type of distortion where two or more radio frequencies interact, resulting in new frequencies not present in the original signal. This can happen when a receiver picks up two dissimilar frequencies that interact with its own electronics to produce sum and difference frequencies, manifested in a whistling noise. It’s often also called ‘Third Order’ Intermodulation due to the third order harmonic that is created - this can occur when two or more wireless systems are used together as they interact to create additional frequencies. The more wireless systems you use simultaneously, the more intermodulation problems are likely to occur. Some transmitters have frequency coordination software that attempts to eliminate the harmonics, and many manufacturers provide tables of frequencies that can be used safely together without intermodulation.


This is a form of circuitry not unlike a noise gate that is often built into wireless receivers. It mutes the audio output when no RF signal is present, or only a very low one - this cuts out any extraneous ‘white’ noise that would otherwise be heard when insufficient signal is received from the microphone, or when the mic is switched off. Most receivers have an adjustable squelch threshold.

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Radio Mics översikt

Line6 Helix HX Effects Epiphone Joe Bonamassa 1958 "Amos" Fender SQ Jaguar Special SS IL CAR Zoom F1-LP Focusrite Clarett 8Pre USB Warm Audio WA73-EQ Presonus Faderport 16 Bose QC 35 II Wireless BK Yamaha DXS15 MKII Palmer PWT 12 MK 2 Zoom F1-SP Fun Generation PL 15 Sub A
Line6 Helix HX Effects

Multi effect pedal More than 100 HX effects, Of which up to 9 effects can be used simultaneously, Import of own Impulse Responses (IRS), Parallel stereo signal paths, Inputs can be switched between line / instrument level, Two assignable...

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599 €
Epiphone Joe Bonamassa 1958 "Amos"

Electric Guitar Joe Bonamassa model, Body and neck: Korina, Fretboard: Certified blackwood, Neck profile: 1958 Rounded C, 22 Medium jumbo frets, Pickups: Epiphone Probucker 2 (neck) and Epiphone Probucker 3 (bridge), Lock Tone ABR-1 Tuneomatic bridge, Including case, certificate,...

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899 €
Fender SQ Jaguar Special SS IL CAR

Electric Bass Body: Agathis, Neck: Maple, Fretboard: Indian Laurel (Laurel), Neck profile: C, 20 Frets, Scale: 762 mm (30"/ Short Scale), Nut width 38 mm, Pickups: 1 J-Style and 1 Split single coil, Black 3-ply pickguard, Colour: Candy Apple...

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205 €
Zoom F1-LP

Field Recorder and Lavalier Microphone Set Two-channel audio recorder, Compatible with zoom microphone capsules, Supports WAV formats up to 24bit / 96kHz or MP3 formats on microSD / microSDHC card (up to 32GB), USB audio interface for PC and...

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198 €
Focusrite Clarett 8Pre USB

USB 2.0 audio interface 24-bit / 192 kHz, 18 inputs and 20 outputs, 8 Clarett mic preamps with Air mode model and the classic ISA mic preamp sound, Low noise (-128dB ON), Up to 118 dB dynamic range, Switchable...

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835 €
Warm Audio WA73-EQ

Warm Audio WA73-EQ; 1-channel Mic-Preamp; British 1073-style; fully discrete Class A; Carnhill Transformers; 80dB of Gain (stepped gain switch); Tone Button (changes input transformer impedance); Polarity switch; +48v phantom power; Inductor based 3 band EQ: Low Band Boost/Cut (35, 60,...

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888 €
Presonus Faderport 16

16-Channel DAW Production Controller 16 Professional, touch-sensitive 100 mm motor faders (Dual-Servo Drive Belt), High fader resolution: 10 Bits/1,024 steps, 85 Background and status illuminated buttons, 104 Controllable functions, 16 High-resolution LC displays as digital labeling fields, Timecode and...

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969 €
Bose QC 35 II Wireless BK

Bose Quiet Comfort 35 II Wireless Black Noise Cancelling headphone - Acoustic Noise Cancelling, around-ear design, swiveling ear cups, volume optimized EQ, Google Assistant, up to 20 h running time, includes audio cable, USB charging cable and etui, colour: black

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368 €
Yamaha DXS15 MKII

Active Subwoofer Equipped with: 1x 15" woofer, 1020 Watt Class-D power amp, Frequency range: 40 - 150 Hz, Maximum output level: 135 dB, Black plywood housing with speaker grille that protects entire front and the front edges, XLR inputs/outputs,...

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885 €
Palmer PWT 12 MK 2

Multi power supply for effect pedals 4 Outputs - adjustable from 9 to 18V, 2 Can be interconnected with the supplied Y-cable and deliver up to 36 V output voltage, The maximum capacity of the 9 V outputs is...

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139 €
Zoom F1-SP

Field Recorder and Shotgun Microphone Two-channel audio recorder, Compatible with zoom microphone capsules, Supports WAV formats up to 24bit / 96kHz or MP3 formats on microSD / microSDHC card (up to 32GB), USB audio interface for PC and Mac...

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248 €
Fun Generation PL 15 Sub A

Active subwoofer Speaker assembly: 15" woofer, Power: 250 W RMS / 1000 W peak, Max. SPL: 125 dB, Frequency range: 40 - 250 Hz, Adjustable low-pass filter from 40 - 150 Hz, Inputs: XLR (L + R), XLR (L...

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189 €
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