{"title":"Communication with moving trains in tunnels","authors":"N. Monk, H.S. Winbigler","doi":"10.1109/IRETVC1.1956.207438","DOIUrl":"https://doi.org/10.1109/IRETVC1.1956.207438","url":null,"abstract":"This paper describes tests conducted in the North River tunnel of the Pennsylvania Railroad to determine a practical means for communicating with moving locomotives and trains in tunnels. It is shown that frequencies between about 25 and 1500 megacycles per second are not suitable for such communication over any substantial distance when employing conventional radio techniques. Tests are described utilizing other means of transmission, including the use of a series of antennas bridged onto a transmission line extending through the tunnel, and a closely-spaced two-wire line without antennas acting as a radiating and pick-up device. It is concluded that satisfactory transmission in tunnels can be obtained for a distance up to approximately 6,000 feet using the frequencies and equipment ordinarily employed in railroad mobile systems and twin-lead cable such as RG-86/U suitably located within the tunnel.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1956-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121862189","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 occurrence of Esand F2skip in the 30-50 Mc mobile band","authors":"E. Allen","doi":"10.1109/IRETVC1.1956.32895","DOIUrl":"https://doi.org/10.1109/IRETVC1.1956.32895","url":null,"abstract":"The purpose of this project was to use silicon transistors in place of vacuum tubes in all sections following the mixer stage of a military type communication receiver. The hybrid receiver built, while keeping the desirable characteristics of the vacuum tube receiver also provided for an increase of audio power and a reduction of battery power drain.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1956-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121888992","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":"AM systems for 1955","authors":"R. Morrow","doi":"10.1109/IRETVC1.1956.32898","DOIUrl":"https://doi.org/10.1109/IRETVC1.1956.32898","url":null,"abstract":"A re-evaluation of vehicular communications in the light of narrowing bandpass restriction points to Amplitude Modulation equipment. AM equipment provides full intelligence, a favorable signal to noise ratio and excellent squelch action with only a 6 KC bandwidth. It also retains extreme sensitivity and frequency stability. All this is packaged in a compact but easily accessible unit for convenience in servicing. There are excellent systems in existence, using this type of modern AM equipment which attest to the effectiveness of present day AM communications.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"231 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1956-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115106760","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 Bonneville power administration land-mobile communications system","authors":"M. Peckhart, D. Johannson","doi":"10.1109/IRETVC1.1956.32889","DOIUrl":"https://doi.org/10.1109/IRETVC1.1956.32889","url":null,"abstract":"Radio coordinated traffic light control permits the elimination of the conventional multiconductor cable which must tie together all traffic lights in a system. A VHF carrier modulated with audio-frequency control tones permits the radio coordinated system to perform the same as with the use of a cable plus the possibility of gaining additional benefits. All conventional traffic light control equipment may be used without modification. Several systems have been installed with complete success, gaining advantages in cost and flexibility. It may be expected that this form of control will grow rapidly within the next few years.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1956-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125762231","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":"VHF marine mobile systems in British Columbia","authors":"M. E. Green","doi":"10.1109/IRETVC1.1956.32900","DOIUrl":"https://doi.org/10.1109/IRETVC1.1956.32900","url":null,"abstract":"The purpose of this paper is to give a general description of the VHF Maritime Mobile facilities of the North-west Telephone Company, who provide this type of service to vessels operating in British Columbia Coastal waters. The present four-channel system, which has been in operation since 1948, will be described. A proposed six-channel system, based on assignments in the 152 to 162 mc/s band in accordance with the 1952 International Agreement, will be outlined.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"218 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1956-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115523110","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":"VHF propagation measurements in the Rocky mountain region","authors":"R. Kirby, H. Dougherty, P. L. McQuate","doi":"10.1109/IRETVC1.1956.32892","DOIUrl":"https://doi.org/10.1109/IRETVC1.1956.32892","url":null,"abstract":"Mobile measurements of VHF propagation over various irregular terrain paths have been made by the National Bureau of Standards in the Colorado Rocky Mountain region in an effort to evaluate terrain effects upon broadcast and point-to-point communications at very high frequencies. Mobile measurements of the varying path transmission loss were obtained in a continuous manner while driving along selected routes with a mobile field strength recording unit, which consists of a modified house trailer equipped with a telescoping mast and pulled by a pick-up truck. The paths used ranged from relatively smooth to very rough. The results of the measurements are considered in the light of current irregular terrain theory. The correlation of Sector median transmission loss for different frequencies over irregular terrain tends to be high when the paths are nearly the same, becoming significantly less when the paths diverge. This would indicate that the frequency selectivity of an irregular terrain path is small.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1956-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126620266","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":"Vehicular communications in the petroleum industry","authors":"R. Ransome","doi":"10.1109/IRETVC1.1956.32901","DOIUrl":"https://doi.org/10.1109/IRETVC1.1956.32901","url":null,"abstract":"A brief history of the development and growth of petroleum industry use of radio is given and general applications of mobile radio described. A number of the more pressing and immediate problems common to most mobile services are outlined and several steps toward possible solutions suggested.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1956-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116748487","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 integration of municipal radio systems","authors":"M. Kennedy","doi":"10.1109/IRETVC1.1956.32899","DOIUrl":"https://doi.org/10.1109/IRETVC1.1956.32899","url":null,"abstract":"","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1956-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128226451","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":"Unusual applications of mobile radio peculiar to the forest industries","authors":"R.W. Olin","doi":"10.1109/IRETVC1.1956.32890","DOIUrl":"https://doi.org/10.1109/IRETVC1.1956.32890","url":null,"abstract":"Public benefit of the use of mobile radio in industrial forest work is great. Each year many lives of workmen and visiting public are saved, and huge property damage averted through improved communications by radio. Industrial Tree Farming programs are accelerated and made practical by mobile radio. These programs will provide wood resources and water reserves to be enjoyed as public benefits for many future generations. Most timbered areas have no roads or public communications and are frequently in mountainous regions. Mobile radio easily adapted to the circumstances proves to be the only adequate means of communication to administer, protect, and harvest timber crop3. Modern machines used in forest work are widely scattered on each logging job but radio coordinates their efforts. It might be compared with military use of radio to coordinate the fire power of many mobile units on a single target. Forest Products Radio Service may be small in total radio units, but in effective public use per mobile unit this service has established outstanding national record. Mobile Radio is certainly an indispensable tool of Industrial Forests.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1956-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124807629","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 high performance mobile unit for 450 megacycles","authors":"M. A. Robbins, G. Ayer","doi":"10.1109/IRETVC1.1956.32896","DOIUrl":"https://doi.org/10.1109/IRETVC1.1956.32896","url":null,"abstract":"A simplified transmitter employs a magnetic reactor-modulator and a frequency tripling power stage. The receiver's sensitivity is twice the accepted value of 1 microvolt. This is made possible by the use of a planar-grid triode input stage.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1956-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124585287","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}
京公网安备 11010802042870号
求助内容：
应助结果提醒方式：