MReX-5B Transmitter User Manual v2.07 Firmware
Transmit Commands
*TX_FREQ
*TX_FREQ
specifies the transmit frequency in Hz e.g.
*TX_FREQ=458600000<CR>
*TX_MODE
*TX_MODE
specifies the transport method of the transmitter (how the information is transmitted
over the air).
•
POSCAG_A must be used in order to transmit alphanumeric messages.
•
POSCAG_N must be used in order to transmit numeric messages.
•
WTE_EN must be used in order to transmit 8 bit characters (POSCAG_A transmits 7 bit
characters only).
Accepts POSCAG_A, POCSAG_N and WTE_EN. E.g.
*TX_MODE=POSCAG_A<CR>
*TX_PREAMBLE
*TX_PREAMBLE
set the preamble length in multiples of 32 bits.
Short preambles allows the messages to be transmitted quickly.
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). This very long preamble means that paging
receivers need only to wake once per second (at 512 baud) in order to check for an incoming mes-
sage. If the receiver is always powered and receiving, then much shorter preambles can be used,
and in some cases halve the channel activity.
Typical usage:
*TX_PREAMBLE=18
<CR>
© WTE Limited, 2020 – Christchurch New Zealand
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