Instruction manual

ACU-1000 Operations Manual
2-34 Interoperability Now
2.10.4.3 Flow Chart C Details - Trunked Radio TX Audio Delay Adjustment Procedure
QC1 Is Acquisition Time Known?
Trunked Systems require TX audio delay that matches the normal channel acquisition time.
This delay holds up the RX audio from cross-connected radios until the trunked radio is ready
to begin transmitting. If the Channel Acquisition Time is known, the task is simply to add this
amount of TX audio delay. If it is not known, a procedure must be followed to determine the
proper TX Audio Delay Setting.
(QC1 No) Determine TX Audio Delay Requirement
• Set the TX Audio Delay to its maximum setting of 800 ms.
• Cross-connect the HSP Module to the DSP associated with the trunked radio.
• Transmit via the HSP while monitoring the signal via a receiver that is part of the
trunked system.
• If the first syllable of the transmissions is being cut, more than 800 ms delay is needed.
Contact Systems and Applications Engineering at the Raytheon factory for
recommendations.
• If the first syllable is not being cut, lower the delay setting until it is, then raise the
setting up one step.
• Click “Apply” to save the TX Audio Delay setting.
Jump to QA5. Flow Chart C Complete.
The TX Audio Delay Setting may be a compromise between comfortable
conversation and safety. When it is imperative that absolutely no first
syllables are ever lost, the TX audio delay must be at least as long as the
longest channel acquisition time (normally longest during times of
heaviest system use). This may result in longer than needed delays
during periods of low or normal system traffic. If not sure, leave at max
TX Audio Delay.
(QC1 Yes) Jump to QC2
QC2 More Than 800 ms Delay Needed?
The DSP-2 module can provide up to 800ms TX audio delay. Contact Systems and
Applications Engineering at the Raytheon factory for recommendations if delay requirement
exceeds 800 ms.