If radios or other audio sources were connected to the JPS gateway and the audio levels were not set correctly, this can cause poor audio quality when that device is bridged to other devices in an interoperability net. To prevent or correct this issue:
Set RX Level:
- (ACU-1000/2000) Cross-connect the HSP module to the DSP module being adjusted. (NXU-2/A/B) Get a subscriber unit to the donor device connected to the NXU.
- Monitor the front panel of the DSP module/NXU while the radio is receiving a voice signal at a normal speaking volume level. Listen to the RX audio of the interfaced radio using the HSP handset (ACU only).
- Watch the DSP/NXU 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.
Set TX Level:
- (ACU-1000/2000) Cross-connect the HSP Module to the DSP Module being adjusted, and use the HSP Handset to key the radio while speaking at a normal volume level. (NXU-2/A/B) Get a subscriber unit to the donor device connected to the NXU and an audio source from the distant end of the NXU's RoIP connection.
- Monitor to the TX audio of the interfaced radio on a receiver set to the radio’s TX frequency.
- Increase the TX level of the DSP/NXU until the audio in the monitoring radio stops increasing in level. This is the threshold point where the limiter is preventing the TX level from going any higher. Leave the DSP/NXU’s TX level at this threshold value.
- You may also follow the radio’s recommended TX input audio setting procedure.
- Click Apply to save the TX Level setting.