Instruction manual

ACU-1000 Operations Manual
Interoperability Now 2-31
2.10.4.2 Flow Chart B Details – Basic Setup
DSP Setup With No Templates & No Application Notes
QB1 Is a COR Signal Available?
The default Squelch Type is VOX because it will function with all radios. However, if a COR
(unsquelched) signal line is available, this is usually a better choice. Determine if the radio has
an output that will go either high when the radio unsquelches (Active High COR), or low
(Active Low COR). It may be necessary to change the radio programming to enable the COR
output signal.
(QB1 Yes) Set COR Squelch Type & COR Polarity
• On the DSP Settings Screen, change the Squelch Type To COR.
• The default COR Polarity is Active Low. If the COR signal is actually Active High,
change the COR Polarity setting to Active High.
Note: A radio with active high COR, when connected to a DSP Module
set for Active Low, will keep the DSP’s COR LED on except when the
radio unsquelches.
• Click Apply to save the settings.
Jump to Set RX Level
(QB1 No) Jump to Set RX Level
Set RX Level
The RX (Receive) level must be optimized to allow best system operation. First of all,
conversations, especially conference calls, will be more intelligible if all voices are at the same
volume level. Second, VOX and VMR work best at the proper RX level.
• Monitor the front panel of the DSP module while the radio is receiving a voice signal at
a normal speaking volume level.
• Watch the DSP front panel SIGNAL light. It should flicker with the incoming speech.
If the level is too high, the LED will be on constantly during received speech. If too
low, the LED will never come on, or will flicker only occasionally.
• Adjust the RX Level until the Signal LED flickers with incoming speech.
• Click Apply to save the setting.
Note: If the interface is using speaker audio from the radio, the level will
vary depending on the radio’s volume control setting. Set the RX level in
the DSP to 0 dBm, and then vary the radio volume level until the proper
Signal LED indication is achieved. Note the setting, and keep the
volume control at this setting.