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RFPT100

RFPT100
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RFPT100 An emergency distress beacon is a small battery‐powered device that can be carried on board of ships (called EPIRB = Emergency Position Indicating Radio Beacon), aircraft (called ELT = Emergency Locator Transmitter) and on people (called PLB = Personal Locator Beacon). Once activated it transmits a signal that is detectable by government search and rescue authorities. These beacons are regulated by Cospas‐Sarsat, an international organisation for the search and rescue of persons in distress. The Cospas‐Sarsat system uses a constellation of satellites orbiting the globe and a network of earth stations to provide distress alert and location information to rescue teams anywhere in the world. Using the signals transmitted by the beacon, the system calculates its position to within a few km. The beacon's correct operation depends to a great extent on the stability of the reference oscillator that is used to generate the 406 MHz transmitter signal. Traditionally Oven Controlled Crystal Oscillators (OCXO) have been used for this function. However an OCXO needs significant power and time to heat the internal oven whereas the new Rakon RFPT100 TCXO has a power consumption of only 6mW (typ.) and instantaneously provides a stable output frequency. This results in increased battery life or alternatively allows the use of a smaller battery. The smaller battery reduces system cost and allows future beacons to be smaller and lighter. The RFPT100 TCXO makes use of Rakon's Pluto™ ASIC which is a fourth‐order temperature‐compensation chip. The Pluto™ ASIC uses certain patented features, which enables it to achieve the critical medium term stability, previously unattainable with any TCXO. This unique performance for the first time has enabled the use of compact, low‐cost TCXOs in emergency beacon applications. The Pluto™ TCXO employs One‐Time Programmable (OTP) non‐volatile memory which ensures lifetime reliability under adverse conditions. Standard Specifications Parameter Class I Class II Frequency stability over temperature ppm ppb/min ppb/min ppb ppm ppm V

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Pluto™ TCXO designed for Cospas-Sarsat Emergency Beacons rakonsynchronising connectivityMedium Term Stability - RFPT100Medium Term Stability 65 60 55 50 45 40 35 30 25 20 1.5 1.0 05 00 Residual Medium Term Stability Requirements: Notes: Residual Frequency: s3.0ppb Tmln<class ’> = Tmin (Class 2) = -20’C Mean Slope: ±1 Oppb/mln (Points: A to B. C + twarm-up to D. E + twarm-up to F) ton (Beacon turnon time) ■ after 2 hour "cold soak" ±2.0ppb/min (Points: B to C ♦ twarm-up. D to E + twarm-up) tmeas (Start time of frequency stability measurement) 6 RF Output 7 NC 8 Tri-state...

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RFPT100 2Pages

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RFPT100
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