DOI:10.1049/ree.1966.0001

出版商:IERE    

年代:1966

数据来源: IET

摘要:

In flight simulators great care is taken to display to the pilot under training, as accurately as possible, the instrument readings appropriate to his handling of the aircraft. The pilot cannot make full use of this information, however, unless it is presented in correct relationship with other data derived from his simulated environment. The paper traces the development of environmental simulation, with particular reference to control loading, fuselage movement and visual systems

DOI:10.1049/ree.1966.0002

出版商:IERE    

年代:1966

数据来源: IET

摘要:

Reliable digital storage at linear densities as high as 20 000 khzs per mc as result e from a n investigation establishing means of providing optimum recording and reproducing resolution. High linear densities make greater lateral densities practical by reducing interference between tracks. High lateral densities have been demonstrated: 1000 tracks per inch with special head structures, and 4000 tracks per inch with selective-erasure techniques. An area density as high as 32 million bits per square inch has been achieved.These developments remove some of the apparent limits of area density in magnetic recording, and place the emphasis on the necessity for improving reproducing techniques

DOI:10.1049/ree.1966.0003

出版商:IERE    

年代:1966

数据来源: IET

摘要:

An experimental investigation into extending the operation of p-i-n diode modulators from 18 Gc/s to 40 Gc/s is described. Wafers of stacked p-i-n diodes are considered but most success is achieved with arrays of unencapsulated post-mounted diodes. By reducing the dimensions of diodes of this type used at lower frequencies, broad-band modulators can be designed to operate at frequencies up to 40 Gc/s. A minimum on/off ratio of about 10 dB and an insertion loss of < 2 dB can be obtained over a 1.5 to 1 band of frequencies.

DOI:10.1049/ree.1966.0004

出版商:IERE    

年代:1966

数据来源: IET

摘要:

The design of a 4 Gc/s nitrogen-cooled non-degenerate parametric amplifier suitable for installation at the focus of a dish aerial in a communication-satellite-system earth-station is described. Two singlediode amplifiers, each of 15 dB gain and 70 Mc/s bandwidth to the −3 dB points, are cascaded to provide a minimum gain of 30 dB and a −3 dB staggered tuned bandwidth of 60 Mc/s with 1 dB ripple in the passband. The noise temperature of the amplifier including a cooled circulator when cooled to 77°K is 35 ± 5°K (with contributions from the waveguide connexions and external circuitry increasing the overall noise temperature to 46 ± 5°K)

DOI:10.1049/ree.1966.0005

出版商:IERE    

年代:1966

数据来源: IET

摘要:

The paper discusses the steps which could be taken in the early design stages to predict, assess and then verify the reliability of the component parts of the system. Prediction of “mean time between failures” of electronic equipment is dealt with in particular. The A.G.R.E.E. type of testing carried out by the manufacturer to determine the reliability of his final product is described in some detail in an Appendix.

DOI:10.1049/ree.1966.0006

出版商:IERE    

年代:1966

数据来源: IET

摘要:

A direct digital integration of circuit equations was used to study the transient behaviour of a varactor bridge doubler circuit. A suddenly-applied sine, wave was assumed for the fundamental drive. A piecewise-linear varactor characteristic was used.The calculations show that good efficiency and rapid transient response can be obtained for certain ranges of tuning and bias.Experimentally observed input-output power relations are reproduced remarkably well by theoretically calculated results. These include an abrupt increase from negligible output to high efficiency as output is increased, for fixed bias voltage. Also, instabilities are observed when the power is too high for a given bias. The calculations thus prove that sideeffects such as rectification and avalanche multiplication in the varactor diode are not necessary for the presence of spurious oscillations

DOI:10.1049/ree.1966.0007

出版商:IERE    

年代:1966

数据来源: IET

摘要:

Some fundamental aspects of current- and voltage-controlled negative resistance devices are considered, in particular the relation of the physical mechanism involved to the equivalent circuit. Further, a unified stability criterion is presented which is applicable to both types of device. A versatile analogue of a current-controlled device is described which is compatible with a voltage-controlled analogue previously described. The high-frequency properties of this analogue are examined both experimentally and theoretically to determine the variation of the equivalent circuit parameters with frequency. With the aid of the analogue two circuit configurations are examined: a bistable trigger circuit, and a four-stable-state circuit obtained by the addition of a voltage-controlled analogue. It is believed that the techniques described enable circuits to be investigated at relatively low speeds, thus facilitating the optimization and understanding of a given configuration.

DOI:10.1049/ree.1966.0008

出版商:IERE    

年代:1966

数据来源: IET