[R-390] Grounds

[jrfke5ri at aol.com]

Grounding at two points is not a problem in this case.


John
KE5RI





-----Original Message-----
From: FISCH, MICHAEL <mfisch at kent.edu>
To: R-390 at mailman.qth.net <R-390 at mailman.qth.net>
Sent: Fri, May 28, 2010 11:39 am
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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