Formulae are derived for the path attenuation between two aerials of given effective surface areas, or two parabolic aerials, for conditions of free-space propagation.
Radio rediffusion employs the telephone network for the dissemination of radio broadcast programmes but need not be confined to telephone subscribers.
We have investigated tin doping at high concentrations in InP films grown on InP by liquid phase epitaxy.
Room temperature photoluminescence of p-i-n InGaAsP/InP multiple quantum well heterostructures was investigated under different excitation intensities.
T h e L-type multiplex operates by frequency-division and thus requires a source of carrier power for each channel or group of channels transposed from one frequency band to another.
TWO previous papers before the American Institute of Electrical Engineers discussed the activities of the Bell System in the development of multiplex telephone and telegraph systems using carrier c
The system provides up to 19 high-quality full duplex teleprinter circuits, within the range 300-2750 c/s, over physical, carrier, or radio links.
The system, called ZIG, was developed in Germany to operate on a two-wire transmission line to which the locomotive stations are coupled inductively via loop aerials.
This system was inaugurated on September 10, 1925, between Sydney and Melbourne, 450 miles apart.
T HE use of power from hydro-electric generating stations and central steam plants has increased until single companies serve a territory of many thousands of square miles and the problem of coordi
