Microwave Generator

  • Abele T.
  • Leonard D.

The microwave generator is a highly frequency-stable, low-noise source of microwave power which is the local oscillator supply for the T D - 3 microwave transmitters and receivers. It delivers 0.5W output power and is adjustable to any one of 17 different frequencies: 3780, 3800 . . . 4100 MHz.* To achieve great reliability, minimum maintenance, and low power consumption, it was decided to use only solid state devices. Various devices were considered: varactors, step recovery diodes, and transistors; however, at design time, varactors were the only solid state devices that appeared able to operate at the required frequencies and provide the power levels and reliability demanded. Once varactors were chosen it was possible to determine the over-all circuit configuration. A crystal oscillator operating in the range of 125 MHzf was needed to obtain the required frequency stability. Then a chain, consisting of a cascade of several varactor multipliers, was used to obtain efficient frequency multiplication up to 4000 MHz. A power amplifier had to be inserted between the oscillator and the * This equipment is manufactured for Bell System use only. t In general 125, 500, 1000, and 4000 MHz are used to denote any frequency between 118.125 and 128.125 MHz and their fourth, eighth, or thirty-second multiple, respectively. 1301

Recent Publications

August 09, 2017

A Cloud Native Approach to 5G Network Slicing

  • Francini A.
  • Miller R.
  • Sharma S.

5G networks will have to support a set of very diverse and often extreme requirements. Network slicing offers an effective way to unlock the full potential of 5G networks and meet those requirements on a shared network infrastructure. This paper presents a cloud native approach to network slicing. The cloud ...

August 01, 2017

Modeling and simulation of RSOA with a dual-electrode configuration

  • De Valicourt G.
  • Liu Z.
  • Violas M.
  • Wang H.
  • Wu Q.

Based on the physical model of a bulk reflective semiconductor optical amplifier (RSOA) used as a modulator in radio over fiber (RoF) links, the distributions of carrier density, signal photon density, and amplified spontaneous emission photon density are demonstrated. One of limits in the use of RSOA is the lower ...

July 12, 2017

PrivApprox: Privacy-Preserving Stream Analytics

  • Chen R.
  • Christof Fetzer
  • Le D.
  • Martin Beck
  • Pramod Bhatotia
  • Thorsten Strufe

How to preserve users' privacy while supporting high-utility analytics for low-latency stream processing? To answer this question: we describe the design, implementation and evaluation of PRIVAPPROX, a data analytics system for privacy-preserving stream processing. PRIVAPPROX provides three properties: (i) Privacy: zero-knowledge privacy (ezk) guarantees for users, a privacy bound tighter ...