[1000mp] Let me state my case more fully

Fri, 7 Mar 2003 05:49:55 -0500

Bill
you have a great rf ground on your station, but not on your electrical
service and wiring through out the house. At least as far as rf is
concerned. I had the same problem here on 160 and 80 meters, lots of rf hum
when transmitting and all the chained smoke alarm-CO2 alarms tripping. I was
lucky in my fix. I didn't want to tie the station rf ground together with
the AC ground system, so what I did was install (3) additional 8 ft grounds
6 feet apart from each other and bond them all together, I then added a
additional #2 copper wire from the electrical panel bonding strip to the
copper water line and installed jumpers around any joints in the water line
up to the meter. Result all clean now. Your results are going to vary due to
soil conditions etc at your location. I will add a little more info on this
when I get more time, as have to run right now. I am a electrical
contractor/ ex engineer here.
ken w8ob
----- Original Message -----
From: "ARS NZ3O (Byron) FM29fx" <[email protected]>
To: <[email protected]>; "FT1000MP List" <[email protected]>
Sent: Thursday, March 06, 2003 9:24 PM
Subject: Re: [1000mp] Let me state my case more fully


> I have a similar setup.  I added ICE filters to the amp
> and radio and put my groundrod through the concrete
> floor.  When my antenna is aimed across the house at
> the electrical panel (and my mini PBX) I get common
> mode interference in the electrical panel and a clicking
> in some of the related (X10 bridge) equipment.
>
> Other than that, the only interference I get is on 160 meters
> and that's a problem I have yet to solve.  I suspect alarm system
> leads in the roof.
>
> 73, Byron
>
> At 07:02 PM 3/6/2003 -0600, FireBrick wrote:
> >My shack is in the basement. RIGHT under the Electrical Service and right
> >over the copper water service.
> >
> >My tower is RIGHT outside the basement wall, less than 4 feet from the
rig.
> >The tower is grounded with multiple ground rods around the perimeter of
the
> >tower.
> >The electric meter, on the outside wall also has it's own ground rod as
per
> >local codes.
> >The electric service is overhead.
> >
> >On the outside wall, right behind the rig shelf I Mounted a 3" wide
copper
> >strip.
> >I installed brass washers, bolts and wing nuts spaced about 6" along the
> >length of the copper strip. (not sure of the gauge of the copper but it's
> >like 1/16th" thick) I even used a GREAT BIG iron to put solder over the
bolt
> >head and copper strip.
> >
> >Now my system is not exactly daisychained. MP, Amp, and other ancillary
> >equipment each have a ground strap connected to one of the bolts on that
> >wall mounted copper strip.
> >
> >All coax are terminated with a grounding device outside the wall at a
ground
> >rod.
> >The wall mounted copper strip is also attached to that ground rod and the
> >other end is attached to the water pipe.
> >
> >Rig, Amp, and most of the equipment all have separate circuits, amp is
220.
> >Even the computer has it's case connected to the wall mounted copper
strip.
> >
> >Now unfortunately, the tower is next to the house and the antenna
partially
> >cover the back half of the house. No room to move it farther away, Just
> >can't be done.
> >
> >
> >Now one person did mention that he could measure the difference in ground
> >potential.
> >I'm assuming he was using a vom to measure the voltage between a live
> >circuit and the ground rod.
> >Or is there a better way of doing this.
> >
> >The rfi I experience does not shut down the computer, it doesn't effect
the
> >keyer or DVK.
> >It does interfere with the cable TV on some frequencies. But it does tear
up
> >the phone even though I have both Bell junction box filters and filters
just
> >before the instruments.
> >
> >But listening to myself using the MP's monitor in both cw and ssb
exhibits
> >harshness that varies with band in use.
> >
> >So what mistake have I made?
> >I can't help but think that if I find that one error, the improvement
will
> >be dramatic.
> >This has been driving me nuts for a long time.
> >
> >Plus it will help me work that one last DX entity I need even if Wife is
> >talking on phone or watching TV.
> >
> >
> >
> >
> >-----------------------------------------------------
> >I was married by a judge. I should have asked for a jury.
> >-----------------------------------------------------
> >
> >W9OL, Bill H. in Chicagoland
> >
> >
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>
> All sunshine makes a desert.                (Arabian Proverb)
>
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