Don, Dave et al,
Thanks for all the tips. I was really just wondering about where to
drill holes in the P3, or if it should be bonded at all. I have been
doing much reading on removing common mode signals and was happily on my
way to achieving that with numerous lossy ferrite chokes at strategic
spots. The idea to daisy chain the bonding wire between "boxes" to
minimize ground loops seems like a good one too. I will revise my
grounding. My goal was to make the ham shack as safe as possible for
lightning protection, but the impetus for the project was discovering
that common mode signals were creeping in on all my beverage feedlines.
There are really two different situations that are being addressed.
Reading ON4UN's book (The latest revision) was an eye opener as far as
how common mode signals can mess up a beverage installation. Following
his advice, I have made good strides in stripping unwanted noise from my
feed lines. I am bonding my station ground rods with the power entry
panel ground as well. That will be an expensive undertaking as they
are quite far apart. I am not looking forward to making the trench to
bury the wire.
Thanks again. I'll bite the bullet, drill a hole in the P3 and hope that
it does not interfere with the yet un announced Elecraft P3 Cappuccino
machine option.
Dave K1WHS
On 3/28/2018 9:08 PM, Don Wilhelm wrote:
David,
If your goal is to reduce noise, hum, and buzz in your station, then ---
much better than "grounding", use the "Bonding" techniques suggested
(and tested) in K9YC's information on the subject.
Basically, you bond from enclosure to enclosure with braid or heavy
wire - follow along the path of connecting audio cables and coax.
When you finally get to the end of the path (amplifier or tuner), then
you can connect to your station ground. Connecting each piece of
equipment separately to the station ground can actually make the hum,
noise, and buzz pickup worse.
You are NOT grounding for RF, but for lightning and AC mains
protection for you and your family and pets.
Mother Earth is not a SINK for RF - that is what common mode chokes on
the coax are for, use effective ones.
73,
Don W3FPR
On 3/28/2018 2:54 PM, David Olean wrote:
I have been rebuilding my little hamshack these last few days. I am
only operating on one band (160M) so there is not much gear involved,
but I am trying to do it all correctly to minimize noise pickup from
common mode signals arriving in the shack from many RG-6 beverage
feed lines. Most of my work is outdoors preventing common mode noise
from propagating along the RG-6 coax. To help things along inside
the shack, I have installed a large copper buss bar with numerous
attachment points for wide braid connections to all the AC powered
equipment on the operating bench plus anything else that has RF or
audio involved. I have bonded everything to this buss bar and have
routed a couple of #8 ground wires in conduit from the buss down to
two ground rods situated below the shack. I have a separate ground
rod about 25 ft away for grounding the beverage feed lines. I noted
that several shack items had no provision for grounding. One of them
was the P3 panadaptor.
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