Bandwidth, Frequency Modulation FM | AKG Acoustics WMS 400 instruction

AKG WMS BASICS

Bandwidth

Every frequency-modulated carrier signal does not oscillate entirely within the frequency allocated to it, but also occu- pies frequencies in the adjoining range. This range is known as “bandwidth”. The wider the available bandwidth is, the better the transmission quality. Ideally, different carrier sig- nals should therefore be far enough apart to prevent their bandwidths from overlapping.

Frequency Modulation (FM)

Transforming an audio signal into a radio-frequency one and back again is achieved by means of frequency modulation (FM). This technology has also been used for decades in UHF radio to ensure reliable transmission and high signal quali- ty. This involves imposing an audio signal on a radio-fre- quency (RF) sine-wave carrier that now begins to oscillate in time with the audio signal. Variations in the level of the audio signal (changes in volume) produce frequency chan- ges in the RF carrier signal (transmission frequency). Therefore, this technique is known as “frequency modulation”.

Interference

Overlapping (interference) occurs when the bandwidths of adjacent signals are too wide, or the carrier frequencies are too close together. Parts of the signals transmitted lying in this range are no longer clearly recognized by the receiver, resulting in noise or dropouts. For this reason it is not pos- sible for two or more systems to work on the same frequen- cy. Even if the frequencies are different, one must always ensure that there is sufficient separation between the fre- quencies used.

Example of AKG WMS 40 carrier frequencies

AKG has selected fourteen different frequencies as carrier frequencies for wireless transmission by WMS 40 wireless systems. There is sufficient separation between them to ensure trouble-free operation and optimal signal quality. A maximum of four WMS 40 systems can be operated at any one time, and care must be taken to ensure that none of the frequencies are used twice! If more than four radio links are required simultaneously, AKG offers a series of wireless systems that make it possible to use a higher number of channels at once. Please refer to pp. 30 for detailed infor- mation. The maximum permissible number of channels may vary depending on national frequency plans.

					Color coded for easy identification
					It is easy to match up transmitters and receivers thanks to
					their color coding system. At the same time, the colors also
					tell you the carrier frequency used for the radio link.
➜	➜		➜	➜	Transmitters and receivers using the same carrier frequency
		➜			are coded with the same color. The color code clips on the
					HT 40, SO 40, MP 40, and GB 40 transmitters are removable,
					and can be replaced by the black clip provided.
				➜	➜
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WMS 40, WMS 400, WMS 4000 specifications

AKG Acoustics has long been recognized as a premier brand in the professional audio industry, particularly in the realm of wireless microphone systems. Among its celebrated offerings, the WMS 4000, WMS 400, and WMS 40 series stand out for their advanced technology and robust performance, catering to a range of applications from live performances to studio recordings.

Starting with the WMS 4000, this system is engineered for versatility and reliability. It features a sophisticated transmission diversity system that minimizes dropouts and ensures clear audio quality. The WMS 4000 offers an extensive frequency range, accommodating diverse environments and frequencies. A standout feature is its digital pilot tone, which automatically mutes the transmitter when it is switched off, effectively preventing unwanted noise during transitions. With a range of up to 300 meters, the WMS 4000 is ideal for large venues, allowing performers ample space to move without compromising sound quality.

Next, the WMS 400 series maintains the high standards set by its predecessor while providing a more accessible option for mid-level performers. It combines ease of use with quality audio performance, boasting a user-friendly interface that simplifies setup and operation. The WMS 400 employs an efficient frequency management system, which automatically scans the environment to select the best frequencies available, ensuring optimal performance with minimal interference. The system also features a rugged metal chassis, enhancing durability for live applications.

The WMS 40 series serves as an entry-level solution, perfect for beginners and small venues. It is lightweight and features a straightforward design, making it easy to operate for users without extensive technical knowledge. One of its most notable characteristics is its plug-and-play functionality, allowing for quick setup without complicated configurations. The WMS 40 series also offers excellent sound quality through its crystal-clear audio transmission and robust reception, making it a popular choice for schools, theaters, and small events.

All of these systems benefit from AKG's heritage in sound engineering, incorporating advanced audio processing technologies that ensure superior sound fidelity. They also come with a variety of microphone options, including handheld, lavalier, and headworn microphones, providing flexibility to meet different performance needs. Whether for a professional stage or an intimate setting, the AKG WMS series delivers outstanding performance, reliability, and user-friendly features that cater to a wide range of audio applications.

AKG Acoustics WMS 4000 manual Bandwidth, Frequency Modulation FM, Interference

Models: WMS 40 WMS 400 WMS 4000