How to Record Clean Audio like a True Sound Geek - B&C Camera

Wireless microphones offer more freedom for sound technicians and videographers but can also bring difficulties. It is challenging to ensure that your wireless system behaves as planned, whether you are an experienced touring professional or a first-time user. Not one person nor any of the existing methods on the market are entirely invulnerable from potential problems either. Just saying audio is challenging. 


Knowing the fundamentals of how wireless systems work can save you a lot of trouble in the future. This understanding will enable users to reduce dropouts, interference, and distortion. Here are some helpful tips for avoiding common mistakes.


Avoid "Signal Blockage" 

We strongly recommend that users keep the transmitter and receiver antennas in direct line of sight. Walls, metal objects, and large crowds should be avoided for optimal reception. Therefore, your receiving antenna must reside within the same room as its corresponding transmitter and perched above spectators or any other obstructions.


The human body can take in, deflect and interfere with a wireless mic transmitter's RF signal. Human bodies are mostly made up of salty water, which is why they can absorb this kind of energy. In addition, if someone were to cup their hands around the external antenna on a hand-held transmitter, there would be close to 50 percent or more reduction in its adequate output power. Likewise, when the flexible antenna on a bodypack transmitter is coiled or folded, it weakens the transmitted signal significantly.


Pick the Right Antenna Type and Place it Correctly

Receiver antennas are one of the most frequently misunderstood elements in wireless microphone setups. If you make a mistake with antenna selection, placement, or cabling, it can lead to dead zones within your performance area and low signal strength at your receiver, which may result in frequent dropouts. Therefore, be sure that you exercise the utmost caution when dealing with these components!


Diversity receivers perform much better than single antennas, yet they must be well-positioned to reach maximum output and reliability. For optimum diversity performance, placing the antennas apart by at least one-quarter of a wavelength (around five inches when operating at 600MHz) is essential. Even more ideal would be if you spaced them out by one full wavelength (20 inches for 600 MHz frequencies) with both antennae configured in an open "V" formation. This allows for superior reception no matter how far away or what angle your transmitter may be held from.


For optimal performance, ensure your antenna is in precise line-of-sight with the transmitter. Also, double-check that any antennas you use are compatible with the frequencies of your system; not all antennas can be used interchangeably without risk.


Suppose the receiver is positioned far away from the performance area, such as in a closet or closed rack. In that case, it is recommended to mount ½-wave antennas above where most of your audience will be located. Doing so allows for an optimal line of sight between receivers and transmitters. However, ¼-wave antennas should never be remotely mounted since they require the receiver chassis as a ground plane - which isn't possible when they're not physically connected.


To maximize diversity performance, ensure that your antennas are separated by a minimum of one wavelength - roughly 20 inches at 600 MHz. Increasing the distance between the antenna beyond this point may help facilitate better coverage when covering larger spaces such as stages, churches, or conference rooms but will not improve reception quality significantly.


And for best reception, set up directional antennas far from the stage. Doing so will increase your pick-up of signal in that direction and decrease interference from other angles. If you need to use coaxial cables for connectivity between the receiver and antennae, a line amplifier is essential due to the loss of signal created by this setup. Check with manufacturers about which type of cable suits your needs, as each one has varying net potential losses - ideally not exceeding five DBS!


Manage Your Batteries Like They're Your Babies

Trying to save money, many users of wireless mics continue to opt for cheaper batteries. However, most manufacturers recommend alkaline or lithium single-use varieties as they provide a dependably steady output voltage over the battery's lifespan – an essential factor in avoiding distorted sounds or signal dropouts due to low power supply. After all, transmitter battery life remains one of the primary considerations with these types of devices.


Rechargeable batteries appear to be the optimal answer, yet once these cells are fully charged, they still provide approximately 20% less voltage than a single-use battery.


To ensure that your battery can power a complete performance, measure and compare the voltage requirements of your transmitter with the output voltage of your chosen battery. Lithium-ion batteries offer reliable usage if you use a nine-volt application, while NiMH or NiCad styles may only last for two hours maximum. For AA applications, opt for rechargeable NiMH batteries as they boast similar performance to single-use alkaline ones without having to replace them multiple times throughout use.


Investing in rechargeable batteries is a brilliant idea to save your wallet and the environment, provided you maintain them correctly. After each event, be sure to remove all of the batteries from any transmitters they were used with. This will stop half-drained cells from being put back into use next time and avert disastrous leakage that could break irreplaceable equipment if stored too long!


Get the Gain Setup Right

Adjusting the input gain of your wireless microphone system is one of the most crucial tasks. Too high a setting may cause distortion, while too low may lead to poor signal-to-noise ratios. Most systems feature some control for this purpose, whether in the form of a switch, knob, or programmable adjustment.


Viewing this gain control as you would a "trim" or "gain" adjustment on a mixer is helpful. Its role is to adjust the input sensitivity to avoid overloads, and your signal level remains higher than any accompanying system noise. This ensures optimal performance without compromising quality.


To adjust the gain of a wireless transmitter, mimic how you would for mixer input gain. Turn the control to reach right below when your peak indicator lights up - usually on your receiver's front panel - while singing or playing an instrument. Keep an eye out, as this will help ensure that you get quality sound performance and recording.


To determine the ideal setting for your transmitter gain, monitor the peak indicator: if it is constantly flashing, reduce the gain until you observe occasional flickers; conversely, should it never flash at all during use, increase the gain to where only the loudest signals cause a reaction.


By adjusting the output level control of a wireless microphone system on its receiver, you can enhance the sound clarity and amplify your dynamic range. This setting does not have any bearing over gain settings in the transmitter; if a distortion or weak signal-to-noise ratio is coming from it, then no amount of changing the receiver's output will correct it. Most people leave this knob at maximum as long as their mixer has enough headroom to deal with said level. Henceforth allowing for the optimal audio experience overall!


Bring a backup to be safe with any wireless microphone systems you use. Keep a wired mic on hand in case of technical difficulties so the show can go on without delay or disruption!


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