Jon D Curtis wrote: > > From: "ROY" <[email protected]> > Organization: ESKOM TRI > To: [email protected] > Date: Mon, 5 Aug 1996 07:26:18 GMT+200 > Subject: Cable problems > X-Confirm-Reading-To: "ROY" <[email protected]> > X-Pmrqc: 1 > Priority: normal > X-Mailer: Pegasus Mail for Windows (v2.01) > Message-Id: <[email protected]> > > To treggers > > I wonder if there is any one out there how could shed some light on a > problem that we are experiencing? > > We have Bandwidth Monitoring Equipment (BME) installed in a > sub-station. It is coupled to a microwave link. With noise levels > which are not quite high, it tends to hang up or look to sink again. > > The outputs and inputs use co-axial cable, which runs from the BME to > the radio, through a digital distribution fram (DDF). These cables > seem to be the source of the problem. Is there any way one could > screen these cables? If so what is the way of doing it? or where > could I get information which could help me? > > I would like to hear from any person who could help me in this > regard. > > Thanks a million > > Roy Hubbard > Eskom T-R-I > Tel : 27 11 629-5236 > Fax : 27 11 629-5369 > E-mail : [email protected]
OK, I'll take a stab at it. Have you considered the possibility of differential ground levels? Maybe that's too simple a question, but that's where I'll start. Is the equipment in the same rack, or, are they seperated? By how far? Is your problem really noise, or reflection lose? Are the inputs common mode or differential? Have you swept the cables on a network analyzer to completely elimenate them? Doug
