Page Type: SYMPTOM
Quiet Transmissions means that, during a significant fraction of the time, the scanner is recording content that is rejected due to abnormally low audio levels. There are two possible reasons - either the audio input is running low (and can be raised through the Windows Sound user interface), or the designated programming for the scanner includes channels that are producing non-voice content (such as periods of silence.)
In the normal default software configuration, transmissions with extremely low audio levels are rejected by the software (never sent into Rangecast). This is to screen out silent transmissions with no meaningful content (for example, mic clicks, or total silence.) If the audio level from the scanner is abnormally low, then real transmissions may be screen out by this filter, resulting in missing content on channels received by that scanner.
If the rejected transmissions carried voice content that were too quiet due to level settings, then this error may result in missing content. Even if other scanners in the cluster were operating normally, since Multisync makes scanners collaborate on reception, so that each transmission is captured by only a single radio, transmissions rejected due to audio level settings are lost to the system.
If the rejected transmissions did not carry viable audio content, then including the broadcast channel in the programming may result in missed content on other channels, because when the scanner is locked onto the channel without meaningful content, it cannot detect or record content from other channels.
There are two possible causes for the Loud Transmissions error message.
1) If this error is due to audio levels:
Raise the audio levels in Windows Sound for the audio input from the scanner.
[FAQ-1067] Adjusting Windows audio input levels
The Rangecast audio recording process compresses audio to support a wide dynamic range, but if the levels are too high or low, quality is compromised (and some transmissions may even be discarded). A level control is available in Windows Sound to adjust the input levels from each scanner, and Rangecast provides information about observed levels to help determine when adjustments are needed.