{"title":"A new approach to transistorization of mobile radio telephone equipment","authors":"I. Teose","doi":"10.1109/IRETVC1.1961.207470","DOIUrl":"https://doi.org/10.1109/IRETVC1.1961.207470","url":null,"abstract":"An equipment design is described in which transistors are employed in both receiver and transmitter to reduce power drain and increase reliability. The following design objectives are believed successfully met: Low power drain in receive condition. Tuning adjustments minimized by use of lumped ferrite filters for both first and second I.F. selectivity of receiver. All components easily and quickly accessible for maintenance. Up to eleven r.f. channels available within a one Mc/s band for both receiver and transmitter. Thus particularly adaptable to Maritime VHF. Manufacturing cost of same order as vacuum tube designs of similar r.f. power output. A detailed description is given of a compact unit, suitable for either underdash or trunk mounting in vehicular installations.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1961-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128645384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Wide-band channel for emergency communication","authors":"H. Magnuski","doi":"10.1109/IRETVC1.1961.207468","DOIUrl":"https://doi.org/10.1109/IRETVC1.1961.207468","url":null,"abstract":"A single wideband channel could be assigned to all short range emergency communication systems, resulting in better service and better spectrum utilization. Many independent VHF or UHF mobile users or military nets could use this one channel at random without any form of centralized control or synchronization, and each could transmit different simultaneous emergency messages without significant mutual interference. In reviewing wideband modulation and addressing (coding) techniques, it is shown that Delta modulation and discrete frequency coding is best suitable for this application.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1961-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123533196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The citizens band boom","authors":"Ivan H. Loucks","doi":"10.1109/TVC.1961.6499345","DOIUrl":"https://doi.org/10.1109/TVC.1961.6499345","url":null,"abstract":"The Citizens Radio Service is defined by the Federal Communications Commission as a radiocommunication service of fixed, land and mobile stations intended for personal or business radio communications, radio signalling, control of remote objects or devices by means of radio, and other purposes not specifically prohibited. Its stated purpose is to provide for the use of radio facilities by any citizen of the United States for private shortdistance radiocommunications, radio signalling, or the control of remote objects or devices by means of radio. The author traces its beginning, its progress, and its present situation, - and makes some predictions on its possible future.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1961-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125770951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Mechanical filters for FM mobile applications","authors":"R. Johnson","doi":"10.1109/TVC.1961.6499348","DOIUrl":"https://doi.org/10.1109/TVC.1961.6499348","url":null,"abstract":"The Western Division of Collins Radio Company has developed an electromechanical bandpass filter for use in the low frequency IF of split channel FM mobile receivers. The “Mobile” Filter has a 455 kc center frequency and nominal 3 db and 60 db bandwidths of 13 kc and 26 kc respectively. The filter is fixed tuned, enclosed in a third of a cubic inch package and was engineered with the idea of low price without compromise in performance. The Mobile Filter gives both the equipment designer and user excellent selectivity and stability, so essential when operating under split channel conditions, along with a flat amplitude response and low loss.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1961-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116355349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Personal radio systems and applications","authors":"John F. Mitchell","doi":"10.1109/TVC.1961.6499344","DOIUrl":"https://doi.org/10.1109/TVC.1961.6499344","url":null,"abstract":"This paper is a discussion of the system aspects of radio systems designed to use the new types of Personal Radio Equipments which have been, and are being, introduced to the market in increasing numbers and types. Several actual applications are discussed. These examples cover the two basic types of equipment now in use, which are two-way non-selective call units, and one-way selective calling paging units. The basic capabilities of the personal equipment are examined insofar as they pertain to Personal Radio System Design. The limitation and advantage of this equipment as well as the new uses and applications of this equipment are treated.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1961-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123491795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A two way dial private mobile system for telephone construction and maintenance","authors":"R. L. Flaminio, W. H. Rice","doi":"10.1109/TVC.1961.6499346","DOIUrl":"https://doi.org/10.1109/TVC.1961.6499346","url":null,"abstract":"The assignment of frequencies by the Federal Communications Commission in 1958 for use by the Telephone Industry opened the way for obtaining more efficient plant operations through vehicular communications. The mobile communication system described in this paper was designed to serve the needs of the construction and maintenance forces in the Southwest District of the Bell Telephone Company of Pennsylvania. The system employs decentralized dispatching which permits the supervisory personnel to use the service directly from their respective job locations. This is accomplished by incorporating the talking and signaling functions of the radio system into the standard Bell System 500 type telephone set normally used for the wire line service. Since the dispatch points are located in administrative offices where loudspeaker operation must be avoided, mobile to base station dial signaling is employed. Similarly, dial signaling from base to mobile was used to protect the public from indiscriminate loudspeaker operation. Arrangements are also provided for mobile to mobile calls on a dialing basis. This feature is of significant value to the foremen who supervise a number of cable or line crews throughout a relatively large area.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1961-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131255516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A modular approach to the design of F.M. communication equipment","authors":"B. Tennent, G. G. Armitage","doi":"10.1109/TVC.1961.6499349","DOIUrl":"https://doi.org/10.1109/TVC.1961.6499349","url":null,"abstract":"Through the use of coils wound on subminiature ferrite bobbins, threaded ferrite cup cores and of newly released P.A.D.T. transistors, the T.F. strips of an FM communications receiver have been packaged into two compact, hermetically sealed, pre-tuned components. This ensures built-in optimum performance, reliability and standardisation of an important section of FM receivers for all frequency ranges and simplified maintenance. Similar developments for other sections of FM communications equipment and for Citizen's Band Radio are referred to in this paper.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1961-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126561352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Personal radio antennas","authors":"N. H. Shepherd, W. G. Chaney","doi":"10.1109/TVC.1961.6499347","DOIUrl":"https://doi.org/10.1109/TVC.1961.6499347","url":null,"abstract":"The trend toward personalizing vehicular radio sets has been accompanied by major engineering problems. Of these, one of the most challenging is that of designing an efficient antenna to occupy a small space. Due to these size limitations, personal radio antennas will be referred to as small antennas. This paper will describe a series of tests made under laboratory conditions followed by a coverage study made under service conditions in city streets to evaluate the relative performance of small antennas and accumulate propagation data for system design. The laboratory measurements included a study of the properties of ferrite loop antennas, coils, whips and short wire antennas. The field measurements covered actual recorded field strength data from personal carried transmitters using reference quarter-wave whips. It was concluded that ¾-wave whips even when working against as poor a ground plane as the set chassis offered the best performance. However, the 20 to 25 db of shadow loss found in city streets plus a 10 to 15 db antenna loss even with whips will severely restrict the coverage of personal transmitters. Other steps may be necessary if adequate areas are to be reliably covered.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1961-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125688605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A broadband 160-MC colinear array","authors":"R.F.H. Yang, L. Hansen","doi":"10.1109/IRETVC1.1960.32970","DOIUrl":"https://doi.org/10.1109/IRETVC1.1960.32970","url":null,"abstract":"The design of a 3-element colinear array is described. Over the 152-162 MC band, the array has a minimum gain of 4 db over a half-wavelength dipole and VSWR less than 1.5. The circularity of its horizontal pattern is ± 1/4 db. The array elements are covered and supported by a Fiberglas tube, DC grounds are provided for these radiating elements for lightning protection and reduction in static noise.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1960-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132949564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"15 KC splits—A source of channels in the 150 MC band","authors":"J. McCormick","doi":"10.1109/IRETVC1.1960.32979","DOIUrl":"https://doi.org/10.1109/IRETVC1.1960.32979","url":null,"abstract":"The implementation of 15 KC split frequencies in the 150 megacycle band is entirely feasible, practical, and in the interest of good spectrum utilization, provided only that sufficient geographic spacing is employed between base stations. Equipment meeting the present FCC standards for narrow-band operation is entirely adequate for this type of operation. With receivers having a two-signal selectivity of 40 db or more at plus and minus 15 KC, the limiting factor on interference range is the side-band envelope of the interfering transmitter. But even with receivers having only 20 db of selectivity at the 15 KC points, 15 KC split-channel operation is clearly superior to co-channel operation. Tone-operated squelch will be even .ore effective in reducing interference with 15 KC spacing between the systems than with co-channel operation because the desensitizing effect of an interfering carrier is reduced by as much as 72 db. Tone operated squelch can be expected to completely eliminate nuisance interference due to voice modulation peaks.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1960-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131208170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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