IRE Transactions on Vehicular Communications

A new series of foam polyethylene coaxial cables have been developed by Andrew Corporation. They are called FOAM HELIAX and retain the unique corrugated solid copper outer conductor construction so popular in regular air dielectric HELIAX. Two sizes have been developed, nominally 1/2 inch and 7/8 inch diameters, both of 50-ohm impedance. Connectors in type UHF and type N have been developed for th... View full abstract»

With the advent of semiconductors, there has been a growing trend toward utilizing as many transistors as possible in vehicular-communication equipment. Indeed, complete transistorization is possible for the entire mobile receiver section. In addition, part of the transmitter can also be equipped with transistors. View full abstract»

The ever growing use of two-way radio by business, by government agencies and by the public continually presents to our industry new challenges, new problems to solve. The purpose of this paper will be to cite some of the ways in which broad-band antennas are currently being used to meet these challenges and to suggest some ways in which they may be used to meet challenges in vehicular communicati... View full abstract»

I believe that a relatively few realize the important part the Electronic Industries Association (EIA) plays in establishing industry standards. Nor do many recognize its continuous struggle to influence appropriate frequency allocations to satisfy our immediate and future needs. Actually, much of the progress and stature of the electronics industry as we know it today is due to the quiet but dete... View full abstract»

Having attended several PGVC National Conferences during the past half-dozen years while a member of the military establishment, I arrived at the conclusion that this professional group is largely concerned with civilian vehicular communications. While this may be an accepted fact for most members, it came to me with a sense of surprise and disappointment. The fact that military vehicular communic... View full abstract»

At least a good part of the problem of impulse noise in FM mobile receivers can be traced to its unpredictable nature — even so far as regards any particular installation in any given radio system. View full abstract»

In attempting to prognosticate on the “Unseen Future of Vehicular Communications,” the theme of this 12th annual PGVC National Conference the author is well aware that extrasensory perception techniques, premonitions or just plain crystal-ball gazing may not suffice as prerequisites for this dissertation. It is recalled that not so many years ago, Dr. Frank B. Jewett, the renowned scientist and fo... View full abstract»

Noise interference is “Public Enemy Number One” to the Mobile Communication user. It places a fundamental limitation on his talking range and little can be done about it except to eliminate or suppress the noise radiation at its source. For a great many noises, like those from high tension power lines, this source elimination is either not practical or impossible. View full abstract»

The chicago Police Departments new communications network is considered to be probably the most modern and flexible system of its kind in existence. View full abstract»

This report describes a synchronous pulse-type radio-telephone system for mobile communication use. The system features direct user-to-user communication without intermediate switching, a number of users have a common frequency band but avoid interference by operating in different time channels. Transmission takes place in bursts containing a large number of contiguous samples. This time-compressi... View full abstract»

The problems involved in operating two or more equipments on one antenna are discussed and some methods are given for their solution. These involve the use of various types of linear passive filters. The particular type or niter to be used depends on the number of transmitters and receivers to be coupled, on the frequency separation between them, and whether the frequencies are to be fixed or vari... View full abstract»

Conventional backward-acting A GC circuits acting fast enough to counteract rapid fading will, if stable, suppress neighboring voice frequencies. However, forward-acting AGC is inherently stable, so it can be made very fast by inserting a sharp cut-off filter in the control path. This permits the suppression of 200 cps. fading with negligible effect on the 300–3,000 cps. voice band. Analysis and t... View full abstract»

This paper describes a selective contacting device that is responsive only to sustained frequencies in a discrete narrow band and is insensitive to speech and noise interference. It is of small size suitable for use in a pocket carried radio receiver and is sufficiently stable to permit 33 discrete resonant frequencies, spaced 15 cycles apart in less than an octave between 517–5 and 997–5 cycles p... View full abstract»