The Selection of Wireless Microphones

- Oct 17, 2018-

1. Select the type of microphone (or other source). Applications usually determine which microphone physical design is required: lavalier or pin-type or head-mounted on clothes; hands-free, for singers or microphones must be passed between different users When connected; cable type for use with electronic instruments or other non-microphone sources. Other microphone characteristics (pickup type, frequency response, and directivity) are determined by acoustic factors. As mentioned earlier, the microphone selection for wireless applications should be the same as for wired applications.

2. Select the type of transmitter. Microphone selection usually determines the type of transmitter required (handheld, waistpack or plug-in) and is also application based. General features to consider include: antenna type (built-in or external), control functions and position (power, mute, gain, tuning), indicator light (power, battery status), battery (lifetime, type, and availability), physics Description (size, shape, weight, finish, material). For handheld and plug-in, the interchangeability of the microphone pickup may also be an option; for a bodypack transmitter, the input is detachable; multi-purpose inputs are often necessary, depending on the connector type, wiring and electrical performance ( characteristics of impedance, level, bias voltage, etc.).

3. Select the receiver type. The basic choices are in diversity and non-diversity. For reasons described above in the Receiver section, it is recommended that all applications other than the most budgeted applications use diversity receivers. While non-diversity works well in many situations, the affordability of diversity receivers for multipath problems is often worth the extra money. Other receiver characteristics that should be considered are: control (power, output level, squelch, tuning), display device (power, RF level, audio level, frequency), antenna (type, connector), electrical output (Connector, Impedance, Line/Mic/Headphone Volume, Balance/Unbalanced). In some applications, battery power may be required.

4. Determine the total number of systems to be used simultaneously. It is also important to consider adding new components to the wireless system in the future: selecting a wireless system type that only applies to several frequencies may prove to be the ultimate limit. Of course, this total should include any existing wireless microphone system, and new devices must use it to work.

5. Coordinate system compatibility frequencies and avoid known sources of non-system interference. Consult the manufacturer or highly qualified professionals about the frequency selection and integration issues of the planned number of systems. This should be done even for a single system, and must be done for multiple system installations to avoid potential interference problems. Frequency coordination includes selecting the operating band (VHF or UHF) and selecting a separate operating frequency (for compatibility and avoiding other transmissions). For a fixed location, select the frequency in the unused TV channel. For mobile apps, systems with other alternate frequencies may be required, although this only applies to a few channels. The preferred option for the tour is to use "frequency agile" (tunable) equipment to ensure that all venues have the required number of systems.

6. Determine the auxiliary equipment as needed. This may include remote antennas (1/2 wavelength, 5/8 wavelength, directivity), mounting hardware (brackets), antenna splitters (passive, active), and antenna feeders (portable, fixed). These choices depend on the operating frequency and the individual application.



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