A few thing you may want to be aware of if you want to get the best out of a wireless system for your gig.
1.Bad battery choices
Low voltage brings up problem, like cutouts, dropouts or distortion. So it is important to choose batteries for more stable voltage output instead of battery life, which makes the alkaline or lithium one-time-used batteries a better choice. Especially lithium-ion types outlasts Ni-Mh and Ni-Cad batteries. Because of up to 20% less voltage output, rechargeable battery is far from ideal option as it seems to be. But if you are really o tight budget and rechargeable is the first choice. Just use it and make sure you remove it from transmitters or receiver and charge them up after each use. Besides, it also prevent battery leak from doing harm to components. And it is also crucial to match the voltage requirements of the transmitter and receiver.
2.Over-boosted signalLow battery could result in distortion. But the most common reason is still setting the gain control too high. For some of the systems that includes clipping indicator, it is much easier to monitor and then control the gain input. If the peak lights keeps blinking, you know it is necessary to turn down the gain level. For those systems do not have a indicator, it is better to set the gain at around 70% and run for a short test to see if this level suits you. It will require much more effort to get a clear audio if you do not pay attention to the mic gain at the beginning. Because if you over-boost the mic signal, it will not help by turning down the the volume control later on. Volume adjustment will crank up or decrease both the signal and noise. So it is essential to set a proper gain at the very first place.
Keep transmitter and receiver line-of-sight, and avoid metal objects, walls, and large numbers of people between them. Because the human body will absorb the wireless. Apart from immovable obstruction, don’t cup around the external or built-in antenna (as for a handheld mic, which is often at the bottom), otherwise you will expect 50 percent or more decrease on performance. The same effect will happen on a fold antenna on a bodypack transmitter. It brings us to another thing that needs our attention: antenna placement. Even for a dual antenna system. a proper location still matters, which maximizes the reliability of transmission and performance of the system. Different antennas have different frequency, so it is better not to mis-use antenna.
4.Avoidance of local radio broadcast or TV channelsTV transmission involves much more power than a wireless microphone system, So it makes sense to avoid using frequencies of local TV channels. When we speak of "Local", which is generally considered to be up to 50 or 60 miles, depending on the coverage area of the particular TV transmitter and on the location of the wireless microphone system. Indoor systems suffer less from TV frequencies.Different locations have different frequencies. It is not quite possible to have a set channel to tackle all situation. And you also need to be aware of whether it is multiple systems in your own location or down the street. By the time, your wireless frequencies may need to be adjusted.