Instruction manual, SPT and MPT 31x series transponders
Instruction manual, SPT and MPT 31x series transponders
Instruction manual, SPT and MPT 31x series transponders
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Main Parts<br />
The board holds two voltage regulators which output the<br />
voltages required by the other boards. It also has a crystal<br />
oscillator which is used as the Tx frequency source, <strong>and</strong> a direct<br />
numerical synthesizer for generating the correct Tx frequency.<br />
Driver stages with power control, an output stage with overcurrent<br />
protection, <strong>and</strong> transducer matching circuits, complete<br />
the board.<br />
Receiver board (Rx)<br />
The receiver board is designed to receive transponder<br />
interrogation signals <strong>and</strong> telemetry signals. It contains nine<br />
narrow-b<strong>and</strong> channel receivers, <strong>and</strong> a WIDE-detector <strong>and</strong> phaselocked<br />
loops for generating the right modulation frequencies to<br />
the channel receivers.<br />
Figure 31 Receiver circuit board<br />
The board consists of a two stage amplifier with signal<br />
limitation <strong>and</strong> an anti-aliasing filter, two channel receiver stages<br />
for wake-up, <strong>and</strong> seven channel receiver stages for telemetry<br />
which are all constructed as ceramic hybrid circuits. The channel<br />
receivers perform mixing, low-pass filtering, summing <strong>and</strong><br />
envelope detection. The outputs from the channel receivers are<br />
fed to the microcontroller.<br />
Rx amplifier matching board<br />
The TP-PREAMP 24K Hz acts as a matching preamplifier<br />
between the transducer <strong>and</strong> the Channel Receiver circuit board.<br />
160820/O 85
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