I am so confused about how to properly ground a system. I will have a
two meter and a 440 on the roof of my house. I will run the coax down
to my sofit vents or whatever they are called and run the coax inside
the vents to my shack. Behind the wall where my rquipment will be is a
storage space that I can acess. (This is a finished attic). I will be
using a mobile radio that has two antenna outputs, one for 2 meter and
one for 440.
How do I ground the radio and does it need it? Should the coax itself
be grounded and how? Do I have to purchase one of those surge things
that screws into the coax?
Any advice is appreciated!
my dads a ham
he grounds coax to a separate grounding rod (copper water pipe he jetted
down - 10' I think) which is tied with a #6 or maybe even a 4 to the tower
and loops to the same water pipe ground the elect service is grounded to.
Seems he can't get enough ground ;) But we do have lots of lightning here
on the gulf coast of Florida that still blows up things.
Not flaming, just notice how when someone grounds a metal object for
lightning, they use wire like 6 awg, or 4 awg. But when someone
grounds lighting rods, they used monster cables.
http://www.chopurl.com?552 Does this mean even the 4 awg is too
Ground the coax before it comes into your house.
Also run a ground wire from the mast directly down to ground and put a
ground rod there.
Also run a wire from the ground rod to the ground of your electrical
The lightning WILL get to ground, one way or another. The idea is to
give it another path that does not involve your house or radios.
Also ask on rec.radio.amateur.antenna
Additional information for this and other similar posts.
Application note demonstrates the concept:
Examples of how earthing is installed or enhanced:
Failure to install single point grounding can cause damage:
Above is earthing for secondary protection. This is
inspection for the primary protection:
One discussion in a ham radio group:
Check out the rfi and towertalk mailing lists at www.contesting.com.
Wiring and grounding of stations are frequent topics of discussion, and
the archives should be searchable even without registration.
On 01/25/05 08:31 am firstname.lastname@example.org tossed the following
ingredients into the ever-growing pot of cybersoup:
In "The Doctor" printed in the March 2005 QST, even the ARRL got it
WRONG by saying not to bond to the electrical service. That is in
violation of NEC, and is very wrong. Sorry, but most hams are
clueless when it comes to grounding. I sure was at first, but after
many years of working on tall towers in the communications and
broadcasting industries I've learned a lot about proper grounding.
Ground the coax shield before it enters the house. Use as large a
wire as is practical. No smaller than #6, I try to use at least #2,
or 3" copper strap when I can. Make sure ALL grounds are bonded, Ham
antenna, TV antenna, Cable TV, Power, Telephone, etc. Extra ground
rods are a good idea, as long as they are all bonded together and to
all the utilities listed above. Space them 16' apart if possible, if
you put them to close together it limits the effectiveness during a
lightning strike. Spacing them farther than 16' is not really
Visit www.polyphaser.com for lots of good info on Grounding.
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