Instruction manual

ACU-1000 Operations Manual
Interoperability Now 4-1
4 System Troubleshooting
4.1 System Troubleshooting Overview
This section provides some hints to optimization of ACU-1000 setup based on system
operation symptoms.
These symptoms include:
Missed First Syllables
Missed Syllables in Mid-Conversation
Stuck Channel (system is locked up by one transmitter)
Ping-Pong (cross-connected radios key & unkey repeatedly after end of intended
transmission)
False Keying (inappropriate keying due to RFI)
Inability Of Dispatcher To Gain System Control
Poor Audio Quality
o Incompatible Volume Levels
o Noisy Received Signals
o Audio Shaping To Improve Sound Quality
Unintended Consequences (symptoms resulting from inappropriate settings)
4.2 Missed First Syllables
There are several possible causes for the initial syllables of system messages being missed. To
narrow down the source of the problem, first determine if one of the ACU-1000 extensions is
missing initial syllables from messages from all other extensions, or more likely, that all
extensions are missing the first syllables of messages from a particular extension.
The first example is rare and points to a slow to respond link at the one extension reporting the
problem. This could be caused by a slow-to-key transmitter. This is best resolved by adding
transmit audio delay on that extension to buffer the audio until the transmitter is fully active.
Note: If audio is lost during a transmission as well as at the beginning of
a transmission, first consider the remedies explained in Section 4.3,
“Missed Syllables in Mid-Conversation”