Section
10
Tech Tips
Frequency Interaction
Unfortunately, radio frequency (RF) channels cannot be ran- domly selected for use in radio devices. They must be selected to avoid known frequencies in use, FCC restrictions on the lo- cation of devices, and even interference between your own RF devices. The factory defined frequencies (Groups
Microphone Gain Adjustment
The microphone gain controls on the base station and beltpack are set to
Figure 34 displays the same gain setting as in Figure 33 but brought into a high noise environment. The user’s voice now lights the OM indicator all the time he or she speaks due to the higher noise plus the user speaking louder. The result on the system is distortion on louder speech. The microphone gain must be reduced. The same applies to a user with a powerful voice. If someone sets the system mic gain to their voice and user has a much stronger voice, then the gain will need to be reduced, even if the background noise is the same.
Always remember to set the microphone gain based on the sit- uation and location in which the equipment will be used. If the equipment is used on the field during a football game, set the gain based upon a loud stadium, NOT the quiet stadium 2 hours before a game. If a production studio user has a quiet voice, set the gain to their voice and NOT the stage hand’s loud voice who helped set up the system.
SOUND LEVEL, RMS
OM THRESHOLD
USER'S VOICE
NOISE
SOUND LEVEL, RMS
USER'S VOICE OM THRESHOLD
NOISE
Figure 33 | Figure 34 |
Low Noise Environment | High Noise Environment |
Microphone Gain Set Correctly | Microphone Gain Set Too High |