VocoPro UHF-3800 Operations Instructions download pdf (Page 14)

Tips for Achieving Optimum Performance

Recognizing Interference

The ways of recognizing the type of interference present are observing the RF/AF

LED indications and carefully listening to the audio output. A set of headphones can

be a useful tool in isolating and analyzing interference problems. With headphones it

is easier to listen to one wireless channel at a time, even when the system is in use.

Below are some common interference descriptions. Most likely, one of the below

descriptions matches the symptoms that you may be experiencing.

• If there is interference when the microphones are off, and the noise/distortion is

present from the receiver output when the microphones are powered on, try

turning off all other wireless microphones. If the interference problem is still

present, there might be a direct radio interference problem. Direct interference

is a serious problem that must be corrected in order for the wireless system to

be fully usable.

• Interference in the form of low level-audio tones, whines, whining sounds

whose pitch changes rapidly, or audible voices or music (distorted or not) is

likely to be caused by intermodulation, non-wireless interference or direct

interference.

• If there is interference when the receiver is turned on, in the form of buzzy or

raspy whines with a distinct cadence or rhythm that differs from time to time,

digital interference might be the problem. Common sources include computers,

digital delays, effects processors, lighting controllers, and other digital

equipment using microprocessors and digital signal processors (DSPs).

• If there is no interference when the receiver is turned off and irregular popping,

cracking or buzzing noises on the audio with the receiver on, there may be

electrical interference problems. This kind of interference is usually caused by

electric motors, neon lights, lighting equipment, appliances and other types of

electrical equipment. Electrical interference will generally affect all wireless

systems at a location, not just one system.

• Certain types of buzzing sounds are actually due to interference from TV

stations. If the buzzing sound changes substantially at more or less random

intervals and does not seem to be caused by electrical equipment, the problem

may be TV interference.

• Interference that takes the form of bursts of static or short bursts of noise is

likely to be caused by lightning, intermittent arcing or defective electrical

machinery. This type of random interference is quite rare but can be among the

most difficult to resolve.

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Tips for Achieving Optimum Performance

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VocoPro UHF-3800 Operations Instructions Page 14