Multitone RPR 583, Technical Manual

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RPR 583
TM1212 Issue 1 Page 3 - 3
The RF signal enters the aerial and is fed to the dual conversion superheterodyne
receiver. The signal is demodulated from RF to baseband frequencies, converted
to digital format and is then fed to the decoder. This results in the received data
activating the memory, display and the selected audible alert or vibrate alert.
To prolong the life of the battery, the receiver operates with battery economy mode.
When the unit is in standby mode, the receiver is powered up at regular intervals
(equivalent to once per batch) to allow the decoder to search for pre-amble. While
the unit is receiving preamble on its allocated channel, the receiver remains powered
up. This allows the decoder to search for a SYNC word. When the SYNC word is
found, ‘batch lock’ is achieved. In batch lock the receiver is only powered up during
the allocated frame to allow the MK7 decoder to search for its address. If the
address is found, the receiver stays ON for the duration of the message.