Article View: sci.electronics
Article #4165Re: naive question about RF propagation
From: Wm Randolph Franklin
Date: Tue, 16 Jan 1990 22:49
Date: Tue, 16 Jan 1990 22:49
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In article <480ec7fd.15840@valley.UUCP> pfluegerm@valley.UUCP (Mike Pflueger) writes: > >Actually, I had this as an EE problem to solve in college - how the tunnel >could be modified to pass signals of a frequency above cutoff. One way >was to modify the u (mu) of the material in the tunnel - such as a special >gas, or styrofoam, obviously impractical. The real way was to run a wire >through it which extended outside the tunnel. The wire would conduct the >RF into the tunnel and allow reception. I forget the exact details on >length of the wire, but this was in a course taught by John Kraus (Mr. >Antenna) himself, so I'm confident of the solution. Don't (some) subway systems use this so the crew can use radios? -- Wm. Randolph Franklin Internet: wrf@ecse.rpi.edu (or @cs.rpi.edu) Bitnet: Wrfrankl@Rpitsmts Telephone: (518) 276-6077; Telex: 6716050 RPI TROU; Fax: (518) 276-6261 Paper: ECSE Dept., 6026 JEC, Rensselaer Polytechnic Inst, Troy NY, 12180
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!rpi!wrf From: wrf@mab.ecse.rpi.edu (Wm Randolph Franklin) Newsgroups: sci.electronics,rec.ham-radio Subject: Re: naive question about RF propagation Message-ID: <*BR#`|@rpi.edu> Date: 16 Jan 90 22:49:27 GMT References: <28774@amdcad.AMD.COM> <480ec7fd.15840@valley.UUCP> Organization: Rensselaer Polytechnic Institute, Troy NY Lines: 17