IRE Transactions on Vehicular Communications最新文献

{"title":"Frequency management in the forest industries radio communications","authors":"M. Savage","doi":"10.1109/IRETVC1.1956.32891","DOIUrl":"https://doi.org/10.1109/IRETVC1.1956.32891","url":null,"abstract":"Modern trends in uhf communication systems indicate an ever increasing use of greater numbers of channels, higher transmitter powers, and decreased antenna spacing. This all adds up to an ever increasing number of systems interference problems. In most instances, a system can be rendered \"interference free\" by adding sufficient selectivity between the receiver or transmitter and its antenna. This added selectivity can be acquired by the use of a new low-loss tunable filter employing two high-Q, aperture coupled, resonant cavities in tandem. The physical construction of these equipments, as well as operating characteristics, will be discussed in this paper.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"41 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":"121618962","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":"Extending mobile radio range by VHF repeaters","authors":"C.A. Kemp","doi":"10.1109/IRETVC1.1956.32894","DOIUrl":"https://doi.org/10.1109/IRETVC1.1956.32894","url":null,"abstract":"The distance from a base station over which a mobile radio may operate is usually limited to near the optical horizon, particularly with frequencies of 150 mc and higher. When it is desired to extend the mobile range beyond this distance remotely controlled base stations involving either telephone lines or microwave relay systems are used quite successfully. However, these systems are expensive, particularly where the cost of the microwave system or telephone line cannot be shared by other functions such as additional telephone channels or telemetering and control channels. By the Judicious use of mountain tops, where available, and the use of unattended automatic repeater (relay) stations, it is possible to extend mobile range from a base station to several times that which is obtained with a single base station without incurring the expense or complexity involved in a microwave relay system. This paper will describe some of the methods which have been used by the Bureau of Reclamation to provide this type of long distance base to mobile coverage. The operations of the Bureau of Reclamation differ somewhat from the average public utility in that the transmission of power or water is on a wholesale basis with very little retail or distribution type operation. Rather than involving a small amount of high voltage transmission with a great deal of complicated distribution which requires a large number of mobile units in a relatively small area, as is the case with most power utilities, the Bureau's power transmission systems involve very long high voltage power lines with few operational centers or base stations and relatively few mobile units, but these mobile units are required to operate over the much greater distances involved. Similarly, the Bureau's large irrigation systems involve transportation of water over hundreds of miles. This also requires a system with relatively few mobile stations but with a requirement that these stations operate over rather long distances. For these reasons it has been necessary to provide unattended vhf repeaters to extend mobile coverage from the operating centers to the ends of the power or water transmission systems. Since most of the Bureau of Reclamation operations are carried on in the sparsely settled areas of the 17 western states, there is often a lack of commercial telephone facilities which could otherwise be used to interconnect operating centers and provide channels to extend radio coverage. Three general types of repeater systems are used. (1) The low band-high band system which utilizes mobiles operating in the low vhf band (approximately 30 mc) with relay links in the high vhf band (approximately 160 mc). (2) The high bead system with wide frequency spacing. (3) The bigh band system with close frequency spacing. One of each will be described.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"59 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":"115412577","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":"450 Mc. coverage tests at Chicago","authors":"K.V. Glentser","doi":"10.1109/IRETVC1.1956.32893","DOIUrl":"https://doi.org/10.1109/IRETVC1.1956.32893","url":null,"abstract":"This paper describes a high frequency two way communication equipment designed for vehicular mounting. A high degree of frequency accuracy and stability along with simplified semi-automatic transmitter tuning is featured. In addition to voice and code transmission and reception capability, facilities for frequency shift keying and teletype operation without the need of additional conversion equipment or power supplies are provided. A telephone and ringer circuit operating over the two wire remote control line is incorporated. Photographs and block diagrams of the various units are shown.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"26 4 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":"123217378","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":"Spectrum compression and its problems","authors":"C. Schultz","doi":"10.1109/IRETVC1.1956.32902","DOIUrl":"https://doi.org/10.1109/IRETVC1.1956.32902","url":null,"abstract":"","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"31 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":"127901264","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":"D. C. transformers","authors":"J.S. Smith","doi":"10.1109/IRETVC1.1956.32897","DOIUrl":"https://doi.org/10.1109/IRETVC1.1956.32897","url":null,"abstract":"The introduction of power Junction transistors as switch devices has opened new horizons to mobile power supply design. The use of these devices in conventional circuits presently offers equipment capable, within the temperature limits of the transistors, of outperforming present Vibrator Supplies at low power levels. As power transistors are improved wide application of this principle of D.C. to D.C. conversion is inevitable.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"18 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":"134004336","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 operational fixed microwave council","authors":"C. D. Campbell, J. Keller","doi":"10.1109/IRETVC1.1955.32877","DOIUrl":"https://doi.org/10.1109/IRETVC1.1955.32877","url":null,"abstract":"","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1955-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121032769","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":"Management of communications in industry","authors":"J. McKinley","doi":"10.1109/IRETVC1.1955.32872","DOIUrl":"https://doi.org/10.1109/IRETVC1.1955.32872","url":null,"abstract":"","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1955-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122026273","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":"Mobile radio changes the pace of the nation","authors":"M. Floegel","doi":"10.1109/IRETVC1.1955.32878","DOIUrl":"https://doi.org/10.1109/IRETVC1.1955.32878","url":null,"abstract":"The purpose of this paper is to direct attention to the many uses of radio communication systems, some of them unusual and seldom heard of, and to show how organizations, through the use of radio, are better able to coordinate their activities and thus provide a quicker and more efficient service to the public.","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"315 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1955-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123681853","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":"Radio equipment which meets the challenge of 6 and 12 volt vehicles","authors":"K.E.H. Backman","doi":"10.1109/IRETVC1.1955.32879","DOIUrl":"https://doi.org/10.1109/IRETVC1.1955.32879","url":null,"abstract":"","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1955-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124896145","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 communications consulting engineer's notebook","authors":"V. J. Nexon","doi":"10.1109/IRETVC1.1955.32876","DOIUrl":"https://doi.org/10.1109/IRETVC1.1955.32876","url":null,"abstract":"","PeriodicalId":263631,"journal":{"name":"IRE Transactions on Vehicular Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1955-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131517820","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}