Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!lll-winken!uunet!mcvax!kth!sunic!dkuug!auc!vax87!i8bla From: i8bla@vax87.auc.dk Newsgroups: sci.electronics Subject: Re: radio reception Message-ID: <81@vax87.auc.dk> Date: 21 Jul 89 11:47:54 GMT References: Lines: 31 In article , gutherz@athos.rutgers.edu (Matt Gutherz) writes: > > A while back (months) there was a discussion about improving > radio reception in basements etc. Someone posted a solution > using 2 antenna and some coax. Does anyone have the posting > or know the specs for the antenna? Thanks in advance. > > > Matt gutherz@jove.rutgers.edu Radio propagation inside buildings. The system you mention is probably the 'leeky feeder'. This can be used in tunnels, where you place an antenna outside to pick- up the radio signal, an retransmit it on the coax cable. If the cable has some slots, you will experience an electromagnetic field, radiating from the cable. The problem is to get a field with no severe power fades. Such systems are already imple- mentet in Europe, retransmitting FM radio broadcast. I have an extra question: Does anyone have any experience in radio propagation inside buildings at 2 GHz as a function of building materials? (Bricks, concrete, reinforced concrete, wood, glas etc). I would be glad to hear about any practical experiments or theoretically modelling. Bo L. Andersen Aalborg University Denmark