Artificial Pulsar User's Guide

The NRAO in Green Bank has developed a hardware test fixture for validating pulsar data acquisition systems. This system is called the Artificial Pulsar. The test fixture has dual polarization outputs. There are different length cables attaching the signals to the backend inputs, so the relative timing of signals can not be assumed to be simultaneous.

This note summarizes its functions and typical settings. The artificial pulsar has two major components:
  • A commercial signal generation unit that has pulse capability
  • A broadband noise source and signal combiner with gain/attenuation capabilities and monitor functions.
artificialPulsar.JPG artificialPulsarFlash.JPG
Artificial Pulsar hardware, showing the signal generator and gain control,

Settings

The signal generator allows a variety of pulse intensities and profiles. The following settings are commonly used:
  • Pulse Frequency: 300 Hz
  • Pulse On Output Level: +15 dBm
  • Pulse Off Output Level: 0
  • Duty Cycle: 1%
  • Edge Time: 5.8 nanoseconds

The gain control unit attenuations are:
  • Pulsar Attenuation: 22 dB
  • Output Attenuation: 3 dB

The gain control unit has an LED readout, with switch selector. With the switch at the "Pulsar" setting, the LED reads 2.75

Output Pulsar Profile

Someone should put a plot here!

-- GlenLangston - 28 Aug 2008

Topic attachments
I Attachment Action Size Date Who Comment
artificialPulsar.JPGJPG artificialPulsar.JPG manage 620 K 2008-08-28 - 11:25 GlenLangston Artifical Pulsar
artificialPulsarFlash.JPGJPG artificialPulsarFlash.JPG manage 1004 K 2008-08-28 - 11:26 GlenLangston Artifical Pulsar Flash Photo
Topic revision: r1 - 2008-08-28, GlenLangston
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