Instruction manual

ACU-1000 Operations Manual
Interoperability Now 2-29
QA6 Is Noise Reduction Required? [Affects RX Audio Only]
The DSP module has a Digital Noise Reduction Mode that can be used to clean up noisy
received signal input. This affects noise that is mixed with the speech signals, not RF noise
that unsquelches a radio, creating a loud noise burst. The only method to find the correct
amount of Noise Reduction to apply is to listen to the received signal as the level is changed;
this is best done using the HSP Handset so that you can be sure that all noise heard is from the
radio’s received signal. Do not use the HSP speaker or a cross-connected radio. A little Noise
Reduction goes a long way, and too much will give the received signal a fuzzy, artificial sound.
It may be advantageous to attempt to improve the signal quality by other means (such as
improving antenna placement) before adding Noise Reduction.
(QA6 Yes) Adjust Noise Reduction
• The default setting for Noise Reduction is Off (no reduction). While listening to the
received signal, increase the Noise Reduction setting one step at a time until the best
signal quality is reached.
• If possible, listen to the receive signal from several different sources and determine the
Noise Reduction setting that works for most.
• If the signal quality is later improved, revisit the Noise Reduction setting.
• Click “Apply” to save the setting.
Jump to “Operational Test & Final Adjustments”.
(QA6 No) Jump to “Operational Test & Final Adjustments”