[AMRadio] Station Grounding


Bob Macklin macklinbob at msn.com
Mon Nov 5 16:43:31 EST 2007


Consider that the old BOATANCHOR rigs were made at a time before the current
3 wire power distribution system. They were not connected to ground through
the power wiring. And it was not necessary to connect them to a ground. A
dipole antenna really does not require a ground. If you are getting noise
int your receiver try running with ground isolator adapter. That should tell
you if the noise is coming in on the ground.

I live in a retirement apartment complex. We have some kind of orange arc
lamps in the courtyard that really make a mess of 75M. There is nothing I
can do about them. And guess waht? They are only on at night.

In addition to that, 90% of the new electronics seems to have a micro
computer in it. Every one of these things generates RFI!

That plus my TWO computers, 3 printers, and scanner!

At least I have one switch that kills the entire computer system!

Bob Macklin
K5MYJ
Seattle, Wa,
"Real Radios Glow in the Dark"
----- Original Message ----- 
From: <DOXEMF at aol.com>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Monday, November 05, 2007 1:11 PM
Subject: Re: [AMRadio] Station Grounding


> "Bob Macklin" writes:
>
> >What is the concern with the grounding? Is it noise reduction or better
> >antenna perfomance?
> <snip>
>
>  Hello,
> Antenna performance is not the issue. The coax fed dipole
> is resonant at the 75 mtr AM area. Some RF in the shack is inevitable with
the dipole about 20ft over my head. Not an issue.
>   What I am concerned with is the advisability of seperating the house
earth from the station (RF) earth.
>   With heating season here the oil burner for the first floor business has
a new solid state high voltage ignitor that generates considerable phase
control noise visable on the AC line and this happens to have serious
harmonic content with an almost complete wipeout of the 3875-3890 portion of
that band.
>   I do not know if the building ground is even still properly connected to
a good earth point. It's not my building.
>   So, with this said I feel that there is the possibility that the house
earth conection is useless and would like to use a (clean) earth for the
entire station power along with some filtering as appropriate.
>   I have been in the live sound business for at least 30 years and
floating certain grounds for loop and noise elimination has often been
necessary but not really code.
>
> Anyway, that is the story. A noise and safety issue rather than
RF/Antenna.
>
>  73,
> Bill, KB3DKS/1
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