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Advancements in 4-Bit Observing with APSR: Exploring Pulsar Science and Signal Fidelity

This document discusses the 4-bit observing capabilities of the APSR system, specifically focusing on the advantages and disadvantages of using 4-bit versus 2-bit modes. The 4-bit mode offers higher fidelity signals beneficial for polarimetry and enhances our understanding of pulsar emission physics, opening the door for exciting new discoveries. However, it comes with challenges, including reduced bandwidth and more complex processing requirements. Detailed instructions for implementation are provided, aiming for completion by late 2007.

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Advancements in 4-Bit Observing with APSR: Exploring Pulsar Science and Signal Fidelity

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  1. 4PSR A Brief Discussion ofAPSR & 4-bit Observing

  2. APSR • (A)TNF (P)arkes (S)winburne (R)ecorder • 8-bit sampling capabilities (CPSR2: 2-bit) • Up to 1GHz bandwidth (CPSR2: 128MHz) • Use the Pulsar Digital Filterbank as a front-end • Estimated completion: late 2007

  3. 4-bit ObservingThe Good • Higher fidelity signal • Good for polarimetry • Pulsar emission physics • Possibility of exciting new discoveries! • Instructions are documented

  4. 4-bit Observing The NotSoGood • Half the bandwidth of 2-bit mode (64 MHz) • Fiddly • Change cables • Change mode in software • Slower processing • Need to stitch together single polarisations

  5. 2 bit vs. 4 bit

  6. J0437 Stokes Navarro, J. et al. 1997

  7. Ragnetar - XTE J1810-197

  8. http://www.atnf.csiro.au/research/pulsar/observing/4bit

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