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ANITA Calibration System

ANITA Calibration System. Jason Link University of Hawaii. ANITA Collaboration Meeting at UCI 4/7/05 – 4/9/05. The ANITA Calibration System. Calibration System Overview Noise Diode RF Tickler Status. Calibration System Diagram. Noise Diode Design History.

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ANITA Calibration System

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  1. ANITA Calibration System Jason Link University of Hawaii ANITA Collaboration Meeting at UCI 4/7/05 – 4/9/05

  2. The ANITA Calibration System • Calibration System Overview • Noise Diode • RF Tickler • Status

  3. Calibration System Diagram

  4. Noise Diode Design History • Original design was to have 10 noise diode each split 8 ways into each QRH RF channel. • In the process of SURF prototyping Peter raised a concern that this design leads to a correlated noise signal in which is undesirable for testing of the trigger system. • Redesign to have a unique noise diode for each QRH RF channel with a simple bias circuit.

  5. Noise Diode Module - Design • Larry Ruckman has laid out a board to accommodate two NC305 Noisecom Noise Diodes (10 Hz-3GHz, 30-35 ENR) on a 24V Bus. • Board fits in 1.5” sq RF aluminum box from Compac-RF (same box used for Mini-Circuits ZKL-1R5). • Plan to use one module per RFCM. Noise diodes to be placed only in QRH RFCMs.

  6. Calibration Pulser Box (Inside Main EMI Enclosure) • Open Design Issues/Questions • Unknown if AVTECH works in Vacuum – test required. • TTL control of Pulser and Switch may require inverter as Acromag uses Active Low Logic. • Monitor Line to be read out by SURF channel? • Finalize antenna choice (DiscCone?) and location.

  7. AVTECH AVP-2S-M Pulser • 0-2V amplitude pulser capable of pulses between 0.2-4.0 ns. • Very fast pulses – rise time ≤ 50 ps, fall time ≤ 200 ps with rate up to 1 MHz. • Triggered via TTL pulse. • Unit will have a monitor line which provides a 20 dB attenuated coincident replica of pulser output. • Must get customized unit to work on +24V power bus – AVTECH can provide at a cost of $3547 • AVTECH can also provide a +24V unit with temperature-stabilization circuitry so the pulse width when operated at 0.2 ns will not vary more than +/- 20% as temperature varies from 12-27 degrees and instrument will not be damaged operating from 0 to 50C (as opposed to the nominal 0-40C). Pulse width would be limited to 1 ns rather than 4ns. Cost increases to $5945.

  8. Calibration System Status • Have quotes from AVTECH on pulser (~2.5 month lead time) • RF Switch has been ordered • ND components for EM flight are in house, boards and boxes should be arriving this week, ~1 week to stuff all boards for EM flight, ~1 week to test. • Have not done any work on antennas for pulser.

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