[R-390] Grounds

[Judi Doran]

Hi Mike: well, here is the deal. you really do not have a ground!! if you 
want a good ground you need multiple ground rods seperated by ten or more 
feet and connected by buried bare copper.  the ground scheme here is six 
driven rods under the house footer connected by #4 bare copper, rods are 
about twenty feet apart.  then a bare #4 copper about 90 feet long to our 
well casing.   That produced a very good power ground system, about two or 
so Ohms.    a single ground rod depending on soil, moisture, etc is in the 
range of 15 to 30 Ohms.  A RF ground is a whole different story, use as much 
wire as you can find laid out on the surface or just below. my 80 meter vert 
and 40 meter array has more than nine miles of radials, that is probably 
overkill!   stretch out wires in a partial radial pattern in your yard and 
connect to the ground rod. Then run a heavy copper conductor or braid around 
the house and connect to the incoming service ground rod.  also would 
suggest a nice fat MOV in the service entrance box, but connect it to a two 
pole 50 or more Ampere breaker, your range or AC breaker.  local electric 
supply should have the fat MOVs.  Bernie W8RPW
----- Original Message ----- 
From: "FISCH, MICHAEL" <mfisch at kent.edu>
To: <R-390 at mailman.qth.net>
Sent: Friday, May 28, 2010 2:39 PM
Subject: [R-390] Grounds


> Hi:
>
> I finally moved the shack to the  basement, pounded an 8' ground rod 
> outside near the shack and I am more-or-less ready to attach a real ground 
> wire and put up a real antenna for my 390a.  Now this has lead to a 
> question.  My AC service entrance is on the other side of the basement. 
> If I ground the input coax, then I have my receiver grounded at two places 
> (low freq at the service entrance) and RF (but I imagine low freq also) 
> via coax and a ground wire from my ground.  This seems like a ground loop 
> ready to happen.  The pearls had a lot of good info, but I did not seem to 
> find this one.   The ideal I imagine would be to have the shack near the 
> service entrance, or all at RF ground.  I imagine that using a fireman's 
> friend to lift all the AC power grounds and the external ground is not 
> good practice.  Also many of the more practiced people on the net have 
> undoubtedly solved this.
>
> My thanks in advance.  Remember the soldiers that died for our freedom on 
> this Memorial Day.
>
> Mike
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