[Antennas] Off Topic: RFI - AM Broadcast

[Mark]

Regardless of the power the broadcast station is running, IT IS NOT
TRANSMITTING ON AN AUDIO FREQUENCY .. ,,..,,  --guarandamnteed . .. . YOU
have the problem . not the commercial transmitter .. but, I think you
realize that???????
----- Original Message -----
From: "Tim" <kd5ckp@centurytel.net>
To: "Antennas" <antennas@mailman.qth.net>
Sent: Wednesday, November 20, 2002 3:32 PM
Subject: Re: [Antennas] Off Topic: RFI - AM Broadcast


> meanwhile back at the shack ...
>
> Well a technician from the local phone company just left my shack and he
> came over with a filter of non-descript type and origin. The filter was
> black, round, and had no external markings on it that I could
identify(can't
> see well and did not have my glasses handy. The entire thing was about
3/4'
> thick and 1" diameter and had a series of colored wires coordinated to the
> contents of the "Box" outside. He said "This might work if not ...." ..
> He finished installing it and we came inside and tried the modem once
again.
> This filter/isolation transformer/whatever worked very well or the radio
> station reduced power ahead of schedule. They normally reduce power at
17:00
> and this was at 16:30.
> I intend to find out exactly what was in that little package and I will
> relay the info to the list as an FYI.
>
> On another note ....
> For those of you that have access to such stuff ... does anyone know where
I
> can get AutoCAD Blocks for Schematic Symbols??
>
> > ----- Original Message -----
> > Sent: Sunday, November 17, 2002 9:06 AM
> > Subject: [Antennas] Off Topic: RFI - AM Broadcast
> >
> >
> > > Starting early Friday morning I started having trouble connecting to
the
> > > internet. I thought "well water has gotten into the prone box again"
(it
> > was
> > > raining at the time) so I investigated that possibility. That was not
> the
> > > problem so I pondered other possibilities and came up with nothing
> > > reasonable. I had not changed anything about the shack or anything
else
> I
> > > could think of so I decided to call the local phone company and see
what
> > > information they could offer ... expecting to hear the same
interference
> > on
> > > the handset that I had heard on the modem I picked it up and nothing
...
> > > completely clear dial tone. With a confused look on my face I called
the
> > > phone company and asked them to a technician call me back and again
> > > proceeded to ponder the situation. I attempted to identify the source
of
> > the
> > > interference ... I couldn't quite make out what it was I was hearing
> > through
> > > the modem, but I knew it was voices so I pickup the handset while the
> > modem
> > > was trying to connect. It was the local AM broadcast station, their
> tower
> > is
> > > about 500 yards north of me and it was their signal I was receiving
> > through
> > > my modem. To the best of my recollection I do not ever recall having
> > > interference like this before so I called the station and asked to
speak
> > to
> > > an engineer to see if anything had been changed about the transmitter
or
> > if
> > > he had heard any other complaints and was their a possibility that
> > something
> > > had gone wrong. I finally got to speak to the engineer and he said he
> had
> > to
> > > got to the transmitter the next afternoon for a required FCC
inspection
> > and
> > > field strength survey and would this be soon enough to get back to me
> with
> > > some definitive answers. I agreed and he called me yesterday afternoon
> and
> > > sure enough nothing was wrong that he could determine. I have yet to
get
> > > straight answers from the phone company yet other than mine was not
the
> > only
> > > complaint, but there is no one there on the weekend of course.
> > >
> > > My query in reference to all of this is what could possibly have
changed
> > > that would allow such a drastic amount of interference in my modem and
> > what
> > > would you guys suggest as a possible solution? I recently saw postings
> in
> > > reference to RFI on the list and ordered the "Fair Rite" Catalog, but
> with
> > > about a dozen visitors over the past 48 hours I have not been able to
> > > consider it's contents in this situation. The time is currently 9:52
CST
> > and
> > > I am sure I will not be able to send this message until dusk when the
> > > station reduces power to 5KW so in the mean time with no plans of
> visitors
> > I
> > > am going to try additional grounding and maybe some of the chokes I
have
> > > taken from other items before I trashed them.
> > >
> > > Looking forward to your comments.
> > >
> > > 73 DE KD5CKP
>