<sitemesh:write property='title'/>Reply by S.F. Mahmoud [to 'Comments on "Calculated channel characteristics of a braided coaxial cable in a mine tunnel" '] | IEEE Journals & Magazine | IEEE Xplore <meta name="bingbot" content="nocache"> <meta property="twitter:title" content="Reply by S.F. Mahmoud [to 'Comments on "Calculated channel characteristics of a braided coaxial cable in a mine tunnel" ']" /> <meta property="og:title" content="Reply by S.F. Mahmoud [to 'Comments on "Calculated channel characteristics of a braided coaxial cable in a mine tunnel" ']" /> <meta property="twitter:description" content="Summary form only given, as follows. The comments of Prof. Delogne on our paper ("Calculated channel characteristics of a braided coaxial cable in a mine tunnel") seem very appropriate and instructive. I do agree with Prof. Delogne that at low frequencies, questions related to the receiver noise and perhaps the receiver matching become of primary importance. The coupling loss in the aforementioned paper is actually related only to the mutual impedance between the transmitting and receiving antennas but does not include the input resistances of these antennas. This drawback has been repaired in the paper "Calculated transmission loss for a leaky feeder communication systems in a circular tunnel" by Hill and Wait (1976). However, by limiting the antenna input resistance to a certain minimum value at the lower frequencies, the two definitions of the coupling loss in our papers become identical (within a constant). It is interesting to notice that both papers confirm the result that the coupling loss is a very slowly varying function of frequency for frequencies less than about 35 MHz. This is so in spite of the different approaches used in the two papers. Specifically, the coupling loss in Mahmoud and Wait's paper is obtained without assigning any particular location or orientation of the antennas; hence, it can be considered as some kind of average coupling loss over various locations and orientations." /> <meta property="og:description" content="Summary form only given, as follows. The comments of Prof. Delogne on our paper ("Calculated channel characteristics of a braided coaxial cable in a mine tunnel") seem very appropriate and instructive. I do agree with Prof. Delogne that at low frequencies, questions related to the receiver noise and perhaps the receiver matching become of primary importance. The coupling loss in the aforementioned paper is actually related only to the mutual impedance between the transmitting and receiving antennas but does not include the input resistances of these antennas. This drawback has been repaired in the paper "Calculated transmission loss for a leaky feeder communication systems in a circular tunnel" by Hill and Wait (1976). However, by limiting the antenna input resistance to a certain minimum value at the lower frequencies, the two definitions of the coupling loss in our papers become identical (within a constant). It is interesting to notice that both papers confirm the result that the coupling loss is a very slowly varying function of frequency for frequencies less than about 35 MHz. This is so in spite of the different approaches used in the two papers. Specifically, the coupling loss in Mahmoud and Wait's paper is obtained without assigning any particular location or orientation of the antennas; hence, it can be considered as some kind of average coupling loss over various locations and orientations." /> <meta name="twitter:card" content="summary" /> <meta property="twitter:image" content="https://ieeexplore.ieee.org/assets/img/ieee_logo_smedia_200X200.png" /> <meta property="og:image" content="https://ieeexplore.ieee.org/assets/img/ieee_logo_smedia_200X200.png" /> <script src="https://cmp.osano.com/AzyzptTmRlqVd2LRf/6fda1518-2a1e-4b5b-a049-da0bef71dcab/osano.js"></script> <link rel="stylesheet" href="https://cookie-consent.ieee.org/ieee-cookie-banner.css" type="text/css"/> <meta http-equiv="Content-Type" content="text/html;charset=utf-8" /> <meta http-equiv="X-UA-Compatible" content="IE=Edge"> <g:compress> <link rel="stylesheet" href="/assets/css/simplePassMeter.min.css?cv=20240416_000000" /> <link rel="stylesheet" type="text/css" media="screen, print" href="/assets/dist/ng-new/styles.css?cv=20240416_000000"/> <link rel="stylesheet" type="text/css" media="screen, print" href="/assets/dist/ng-new/customStyles.css?cv=20240416_000000"/> <link rel="stylesheet" href="/assets/vendor/swiper/dist/idangerous.swiper.css?cv=20240416_000000"> <link rel="stylesheet" type="text/css" media="screen, print" href="/assets/css/jquery-ui-1.8.19.custom.css?cv=20240416_000000"/> </g:compress> <script type='text/javascript'> var googletag = googletag || {}; googletag.cmd = googletag.cmd || []; (function() { var gads = document.createElement('script'); gads.async = true; gads.type = 'text/javascript'; var useSSL = 'https:' == document.location.protocol; gads.src = (useSSL ? 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You may try again later or <a href='https://ieeexplore.ieee.org/xpl/contact' target='_blank'>contact us</a> for more information.","pdfPricingInfo":[{"memberPrice":"$14.95","nonMemberPrice":"$33.00","partNumber":"1093229","type":"PDF"}]},"getProgramTermsAccepted":false,"sections":{"abstract":"true","authors":"true","figures":"false","multimedia":"false","references":"false","citedby":"false","keywords":"true","definitions":"false","algorithm":"false","dataset":"false","cadmore":"false","footnotes":"false","disclaimer":"false","relatedContent":"false","metrics":"true"},"abstract":"Summary form only given, as follows. The comments of Prof. Delogne on our paper (\"Calculated channel characteristics of a braided coaxial cable in a mine tunnel\") seem very appropriate and instructive. I do agree with Prof. Delogne that at low frequencies, questions related to the receiver noise and perhaps the receiver matching become of primary importance. The coupling loss in the aforementioned paper is actually related only to the mutual impedance between the transmitting and receiving antennas but does not include the input resistances of these antennas. This drawback has been repaired in the paper \"Calculated transmission loss for a leaky feeder communication systems in a circular tunnel\" by Hill and Wait (1976). However, by limiting the antenna input resistance to a certain minimum value at the lower frequencies, the two definitions of the coupling loss in our papers become identical (within a constant). It is interesting to notice that both papers confirm the result that the coupling loss is a very slowly varying function of frequency for frequencies less than about 35 MHz. This is so in spite of the different approaches used in the two papers. Specifically, the coupling loss in Mahmoud and Wait's paper is obtained without assigning any particular location or orientation of the antennas; hence, it can be considered as some kind of average coupling loss over various locations and orientations.","publicationDate":"October 1976","pdfPath":"/iel5/26/23860/01093229.pdf","doi":"10.1109/TCOM.1976.1093229","publicationYear":"1976","pdfUrl":"/stamp/stamp.jsp?tp=&arnumber=1093229","publicationTitle":"IEEE Transactions on Communications","formulaStrippedArticleTitle":"Reply by S.F. 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XPLORE_WEBSERV_YES_NO) { var ACC_MGMT_NEW = 'false'; } var ACC_MGMT_CREATE_URL = 'https://www.ieee.org/profile/public/createwebaccount/showCreateAccount.html?ShowMGAMarkeatbilityOptIn=true&sourceCode=xplore&car=IEEE-Xplore&autoSignin=Y'; var ACC_MGMT_FORGOT_PASSWD_URL = 'https://www.ieee.org/profile/public/forgotpassword/forgotUsernamePassword.html?sourceCode=xplore'; var SPECIAL_CHARACTER_MAPS = '&:.AND.,=:.EQ.,+:.PLS.,#:.HSH.'; var SPECIAL_CHARACTERS = new Array(); var SPECIAL_CHARACTER_REPLACEMENTS = new Array(); var characterMaps = SPECIAL_CHARACTER_MAPS.split(","); for (var i = 0; i < characterMaps.length; i++) { parts = characterMaps[i].split(":"); SPECIAL_CHARACTERS[i] = parts[0]; SPECIAL_CHARACTER_REPLACEMENTS[i] = parts[1]; } var MAX_WILDCARDS = '9'; var MAX_SEARCH_TERMS = '25'; var ALL_SEARCH_FIELDS = 'Search_Index_Terms:Index Terms,Search_All_Text:Full Text & Metadata,Search_All:All Metadata,fullText:Full Text Only,Search_Publication_Title:Search Publication Title,Search_Related_Terms:Search Related Terms,Search_Authors:Author Name,Search_Standard_Ics_Title:ICE Terms,promoTopic:Custom Search,id:Article Number,moduleNumber:Module Number,part_num:Part_Num,issn:ISSN,isbn:ISBN,eisbn:EISBN,issueId:IS Number,pubIssueId:Pub Issue Id,accessionNumber:Accession Number,copyrightHolder:Copyright Holder,copyrightYear:Copyright Year,license:License,documentAbstract:Abstract,publicationId:Publication Number,parentPublicationId:Parent Publication Number,parentId:Parent Id,standardArticleId:Standard Article Id,title:Document Title,parentTitle:Parent Publication Title,parentDisplayTitle:Parent Display Title,publicationTitle:Publication Title,publicationDisplayTitle:Publication Display Title,volume:Volume,issue:Issue,paddedIssueNumber:Padded Issue Number,part:Part,startPage:Start Page,endPage:End Page,filePath:File Path,publicationDate:Publication Date,PublicationYear:Publication Year,onlineDate:Online Date,month:Month,Author:Author Pref Names,authorNormNames:Author Norm Names,author:Authors,authorIds:Author Ids,firstName:First Name,middleName:Middle Name,lastName:Last Name,authorAffiliations:Author Affiliations,authorBio:Author Bio,authorImg:Author Img,referenceCount:Reference Count,citationCount:Citation Count,downloadCount:Download Count,patentCount:Patent Count,multimediaFlag:Multimedia Flag,biomedicalEngFlag:Biomedical Eng Flag,nonIeee:Non IEEE,stdsProductNumber:STDS Product Number,bmsProductNumber:Bms Product Number,status:Status,doi:DOI,articleDoi:Article DOI,publicationDoi:Publication DOI,pdfPath:Pdf Path,pdfSize:Pdf Size,contentSubtype:Content Subtype,Publisher:Publisher,inspecControlledTerms:INSPEC Controlled Terms,ieeeTerms:IEEE Terms,unsiloTerms:Unsilo Terms,authorTerms:Author Keywords,maiTerms:MAI Terms,meshTerms:Mesh_Terms,pacsTerms:PACS Terms,insertDate:Insert Date,ConferenceLocation:Conference Location,indexContent:Index Content,coden:CODEN,documentText:Document Text,standardNumber:Standard Number,preprintFlag:Preprint Flag,rapidPostFlag:Rapid Post Flag,lastUpdate:Last Update,newFlag:New Flag,openAccessFlag:Open Access Flag,publicationOpenAccess:Publication Open Access,promoFlag:Promo Flag,pubmedId:Pubmed Id,duration:Duration,society:Society,conference:Conference,ConferenceCountry:ConferenceCountry,conferenceStartDate:Conference Start Date,conferenceEndDate:Conference End Date,societyUrl:Society URL,idSubject:Id Subject,bookNumber:Book Number,pages:Pages,editionNumber:Edition Number,sequence:Sequence,relatedInfoType:Related Info Type,relatedInfo:Related Info,formatIsbn:Format ISBN,meetingDate:Meeting Date,courseLevel:Course level,courseParts:Course Parts,courseId:Course ID,aboutUrl:About Url,additionalUrl:Additional Url,authorsUrl:Authors Url,openAccessUrl:Open Access Url,openAccessFlag:Open Access flag,partnumVendorurlMediatype:Partnum VendorURL MediaType,brandingImageFile:Branding Image File,coverImageFile:Cover Image File,latestIssueCoverImage:Latest Issue Cover 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Time,startYear:First Published Year,insertDate:Search Latest Date,pbdFlag:Pbd Flag,lmsUrl:Lms Url,currentVolume:Current Volume,graphicalFile:Graphical File,graphicalCoverImage:Graphical Cover Image,graphicalSummary:Graphical Summary,graphicalType:Graphical Type,graphicalAbstractFile:Graphical Abstract File,graphicalAbstractImage:Graphical Abstract Image,graphicalAbstractType:Graphical Abstract Type,graphicalAbstractSummary:Graphical Abstract Summary,authorNativeNames:Native Name,externalId:Article Page Number,standardBundles:Standard Bundles,standardBundleParts:Standard Bundle Parts,virtualTitle:Virtual Title,seriesName:Series Name,seriesId:Series Id,mlHtmlFlag:ML Html flag,promoDates:Promo Dates,promoStartDate:Promo Start Date,promoEndDate:Promo End Date,issueCompleteFlag:Issue Complete Flag,scope:Scope,purpose:Purpose,standardFamilyTitle:Standard Family Title,thumbnailImg:Thumbnail Img,supplementFile:Supplement File,courseFile:Course File,supplement:Supplement,courseAuthor:Course Author,pdhs:Pdhs,ceus:Ceus,courseFirstFrame:FirstFrame Img,idSubTopic:Id Sub Topic,certificateUrl:Certificate Url,standardRoot:Standard Root,icsTerms:Standards ICS Terms,impactStatement:Impact Statement,affirmedDate:Affirmed Date,sourcePdf:Source Pdf,orcid:Author ORCID,algorithmFlag:Algorithm Flag,fundingAgency:Funding Agency,funder:Funder,pricingKey:Map Pricing Key,publicationRollup:Rollup Key,collection:Collection,previewImage:Preview Image,regularDate:Regular Date,ContentType:Content Type,ringgoldIds:Ringgold ID,figure:Figure,mediaPath:Media Path,publicationVolumeOnly:Publication Volume Only,Search_All:All Metadata,Search_All_Text:Full Text & Metadata,fullText:Full Text Only,TypeAheadTerms:Type Ahead Terms,ContentType:Content Type,Author:Author,Affiliation:Affiliation,Topic:Topic,PublicationTitle:Publication Title,PublicationYear:Year,Publisher:Publisher,ConferenceCountry:Conference Country,ConferenceLocation:Conference Location,StandardStatus:Standard Status,ConferenceYear:Conference Year,PublicationPackage:Subscribed Content,StandardPackage:Standard Package,ReadingRoom:Reading Room,StandardTitle:Standard Title,StdDictionaryTerms:Standards Dictionary Terms,TitleRange:Publication Range,StandardRange:Standard Range,RecordType:Record Type,MediaType:Media Type,BookType:Book Type,CourseType:Course Type,PublicationStandardRange:Publication Standard Range,PerpetualYear:Perpetual Year,OpacTitleRange:Opac Title Range,BookSeries:Book Series,SubjectCategory:Subject Category,Sessions:Sessions,TypeAheadPublication:Type Ahead Publication,SubTopic:Sub Topic,CourseDuration:Course Duration,CourseLevel:Course Level,StandardType:Standard Type,StandardSubtype:Standard SubType,StandardModifier:Standard Modifier,IcsTerms1:Ics Terms 1,IcsTerms2:Ics Terms 2,IcsTerms3:Ics Terms 3,SupplementalItem:Supplemental Items,CourseDuration:Course Duration,SpecialSection:Topics,SocietySection:Society Sections,PublicationTopics:Publication Topics,Keywords:Keywords'; var SEARCH_FIELD_REFERENCES = new Array(); var SEARCH_FIELD_DISPLAYS = new Array(); var searchFields = ALL_SEARCH_FIELDS.split(","); for (var j = 0; j < searchFields.length; j++) { parts = searchFields[j].split(":"); SEARCH_FIELD_REFERENCES[j] = parts[0]; SEARCH_FIELD_DISPLAYS[j] = parts[1]; } var refSite='https://ieeexplore.ieee.org'; var refSiteName="IEEE Xplore"; var applicationName = 'Xplore'; var MC_OPERATION_DELAY_TIMEOUT='5000'; var MC_ADDING_DELAY_MSG='Please wait.The selected item(s) is being added to the cart.'; var MC_TIMEOUT='60000'; var MC_OPERATION_DELAY_MSG_FLAG='true'; var MEMBER_PROFILE_CHANGE_USERNAMEPASS_LINK = 'https://www.ieee.org/profile/changeusrpwd/showChangeUsrPwdPage.html?refSite=https://ieeexplore.ieee.org&refSiteName=IEEE Xplore'; var MEMBER_MY_PROFILE ='https://www.ieee.org/profile/myprofile/myprofile.html?refSite=https://ieeexplore.ieee.org&refSiteName=IEEE Xplore'; var MEMBER_PROFILE_ADDRESSINFO_LINK = 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