I'm surprised the cord didn't weld itself together or set something on fire.
Amazing what we try when we don't know better.
Steve
----- Original Message -----
From: "Jim Gammon" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, November 27, 2013 01:50
Subject: Re: Re-station ground
> Hmmh, I couldn't say about that but it brought back a memory of
> when I was in middle school. I can talk about this because it's
> been over 40 years ago. We had a class room with metal counters,
> maybe they all had them. I had found an electrical cord with a
> plug on one end and bare wires on the other, a dangerous thing in
> any case but especially in the hands of a kid in jr high. Well,
> I plugged the cord in and touched the wires to the counter top
> and man how the sparks did fly!
> But, actually to be more scientific about it, to see if one wire
> completed the circuit and would probably mean the countertop was
> grounded, I would have had to try each wire separately on the
> countertop which I may have done, but after all these years, I
> don't remember. What I finally did was to tie the ends together
> then give the plug to another student and have them plug it in.
> You could hear the circuit vibrate in the wall for maybe seemed
> like 20 seconds or so, longer than I would have expected, before
> it quit for the rest of the school year. Jim WA6EKS
> ----- Original Message -----
> From: Colin McDonald <[log in to unmask]
> To: [log in to unmask]
> Date sent: Tue, 26 Nov 2013 23:23:26 -0700
> Subject: Re: Re-station ground
>
> is a stainless steel countertop generally grounded to the house
> electrical
> system?
>
> 73
> Colin, V A6BKX
> --------------------------------------------------
> From: "Steve Dresser" <[log in to unmask]
> Sent: Tuesday, November 26, 2013 2:59 PM
> To: <[log in to unmask]
> Subject: Re: Re-station ground
>
> Colin,
>
> I'd caution against using the grounding of the electrical
> outlets as a
> station ground. I lived in a house where the electrical ground
> of the
> outlets had 150 volts which I measured between it and a
> stainless steel
> counter in the kitchen. It turned out that the house's
> electrical system
> wasn't grounded to anything in the known universe.
>
> Steve
>
> ----- Original Message -----
> From: "Colin McDonald" <[log in to unmask]
> To: <[log in to unmask]
> Sent: Tuesday, November 26, 2013 16:31
> Subject: Re: Re-station ground
>
>
> you already have a ground between the tuner and the radio via
> the coax
> shield...
> You already have full chassis ground through the ground prong on
> the AC
> power.
> However, to avoid RF hot spots on the chassis of your equipment,
> it is
> advisable to use another earth ground of some kind for your
> equipment...either via a ground rod, or to the main electrical
> ground of
> the
> house such as the city side of the water meter on the cold water
> pipe, or
> connected to the ground rod used by the electrical of the house
> if there
> is
> one.
> Also, having a separate ground rod just for the station is good
> because
> that
> can also be used for both RF and electrical ground and will help
> in the
> case
> of a nearby lightening strike etc.
> You need to use a ground bus, and have a wire from each piece of
> equipment
> connected to that common bus...do not daisy chain the grounds
> together.
> In
> other words, your grounding has to be paralel, not series.
> If it's electrical ground, the wire length doesn't matter at
> all...but if
> you are going after an RF ground, the length of the ground wire
> may, if
> you
> are using a non-resonant antenna, or latter line or long wire
> and a
> tuner,
> effect the tuning of the antenna.
>
> Often an additional ground for the station equipment is not
> necesary as
> the
> AC ground takes care of it, but sometimes you may need it if you
> find you
> are having issues with RFI in your audio, or excessive noise on
> receive
> or
> if you are causing RFI to other electronics in the house or with
> your
> neighbors.
>
> 73
> Colin, V A6BKX
> --------------------------------------------------
> From: "Mike Ryan" <[log in to unmask]
> Sent: Tuesday, November 26, 2013 1:10 PM
> To: <[log in to unmask]
> Subject: Re-station ground
>
> So if I have a ground wire running from my ATU's ground stud to
> the back
> of
> the rig's ground stud, considering my rig has a built in power
> supply
> and
> a
> 3 prong plug, this will be fine?
>
> Mike
>
|
