WTE TReX-460, Руководство пользователя

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TReX User Manual v15.30 Firmware
Long preambles are typically used in conjunction with a matching receiver to save battery
power when the receivers is in deep sleep mode.
The POCSAG standard uses a setting of 18 (576 bits – configured in steps of 32). This very
long preamble means that paging receivers need only to wake briefly once per second (at 512
baud) in order to check for an incoming message. If the receiver is always powered and
receiving, then much shorter preambles can be used, and in some cases halve the channel
activity. When the TReX is used as transmitter and receiver at both ends of the link, a setting of
2 (64 bits) will work equally well.
Typical usage:
*TX_PREAMBLE=18 <CR>
*TX_LEAD
Sets the transmit lead-in and lead-out time in multiples of 10ms.
Some receivers require time to settle when a transmitter is keyed up. The command allows the
lead-in and lead-out times to be set.
*TX_LEAD=II,OO<CR>
where:
II is the lead-in time. This is the duration after the carrier is applied BEFORE data is
transmitted. Default is 0, max is 50 (500ms).
OO is the lead-out time. This is the duration AFTER data is transmitted that the carrier is
applied before keying down the transmitter. Default is 0, max is 50 (500ms).
Typical usage:
*TX_ LEAD =5,5 <CR>
*TX_LOG
Enables logging of transmitted messages to the file TX-LOG.TXT. If set to 0, disables
logging, 1 enables logging, and 2 deletes the log file.
Typical usage:
*TX_LOG=0<CR>
*TX_REPEAT
Sets the number of repeated transmissions from all serial protocols. A delay can be configured
between each transmission. Configuration if this item DOES NOT affect messaging from
inputs, the periodic timer or any store and forward function. If the RIC_DB or DMR_DB has
been configured, the repeated transmission will result in ALL entries in the databases being
used for retransmitted messages.
*TX_REPEAT=A,BB<CR>
where:
A is the number of repeated transmissions. Max 5. Default 0.
© WTE Limited, 2022 – Christchurch New Zealand
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