We have made some trial;

 connecting the phone directly to the line caming fron the telephone
company,
 the radio there are not.

 The radio can be listened only on the extentions of the PABX with or
without
 the thelephone line connected, using different type of thelephone.

 Seems that the radio is piked up by the PABX itself...

 The grounding of the PABX seems good.

 Ciao

 Leo

  ----- Original Message -----
>  From: "Russell McMahon" <apptech@CLEAR.NET.NZ>
>  To: <PICLIST@mitvma.mit.edu>
>  Sent: Saturday, February 26, 2000 12:22 PM
>  Subject: Re: [OT] Radio over telephone line
>
> >
> > > Radio pickup is often caused by imbalance in the phone line.
> Longitudinal
> > > sisgnals received by the long "aerial" which the phone line becomes
are
> > > converted to differential signals which then enter the phone
circuitry.
> > >
> > > This unbalance can be in the line itself or the connected equipment.
> > > The telephone company SHOULD be able to determine where the fault is.
> > > This normally requires disconnecting the line at your premises unles
> they
> > > have fancu equipment (either a remote line disconnector or "pulse
echo"
> > > equipment.
> > >
> > > IF you can connect a standard telephone to the circuit rather than a
> PABX
> > > you should be able to tell if the problem is still there. If it is
> present
> > > when you use only a telephone and the building's equipment and wiring
> are
> > > disconnecetd it is probably THEIR fault.
> > >
> > > On what basis did they say that the fault was in your equipment and
not
> > > theirs?
> > >
> > > Imbalance is often caused by a leakage to ground from one side of the
> > phone
> > > line. This can be caused by a hole in a cable pair, corrosion or
> spider's
> > > web in a terminal box or water in a cable - and many other things.
> > >
> > >
> > > regards
> > >
> > >
> > >
> > >       Russell McMahon
> > > _____________________________
> > >
> > > >From other worlds - www.easttimor.com
> > >                                 www.sudan.com
> > >
> > > What can one man* do?
> > > Help the hungry at no cost to yourself!
> > > at  http://www.thehungersite.com/
> > >
> > > (* - or woman, child or internet enabled intelligent entity :-))
> > >
> > >
> > > -----Original Message-----
> > > From: Leo <cacciavite@bigfoot.com>
> > > To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
> > > Date: Saturday, 26 February 2000 22:54
> > > Subject: [OT] Radio over telephone line
> > >
> > >
> > > >Hi friends,
> > > >
> > > >starting from some weeks ago I have to listen one radio commercial on
> my
> > > >wired phone as backgroun.
> > > >
> > > >Sometimes is low volume, and sometimes is too high that cover the
other
> > > >person listening/speaching on the phone.
> > > >
> > > >I have asked to the telephone company, bu he say tha is a mine PABX
> > > problem.
> > > >
> > > >I have inserted a toroid with three loop of telephone line near the
> PABX
> > > and
> > > >near the telephone, but the problem remain the same.
> > > >
> > > >Do you have any suggestions?
> > > >Do you can suppose the cause?
> > > >Why before I do not have been the problem?
> > > >
> > > >Thanks
> > > >
> > > >Leo
> > > >
> >
>