Hi all,
For years I lived in an apartment and just had antenna's in the attic ,
but now having moved to a house in a few months I'll be putting up a
10-160 wire type antenna in my trees. Given the recent spate of serious
thunderstorms, and the accompanying lightning, I'm a bit concerned about
properly grouding the antenna so that I don't fry the house *smile*. I
know about some articles on the ARRL site, but was wondering if anyone
else had some ideas or pointers on how to practically do this ?

Jerry

"Jerseyj" wrote in message
...
Hi all,
For years I lived in an apartment and just had antenna's in the
attic ,
but now having moved to a house in a few months I'll be putting up a
10-160 wire type antenna in my trees. Given the recent spate of
serious
thunderstorms, and the accompanying lightning, I'm a bit concerned
about
properly grouding the antenna so that I don't fry the house *smile*.
I
know about some articles on the ARRL site, but was wondering if
anyone
else had some ideas or pointers on how to practically do this ?

Jerry

Have a look at www.furse.com

They used to do a very good pamphlet about lightning and protection.


--
Woody

harrogate2 at ntlworld dot com

In article ,
Jerseyj wrote:

For years I lived in an apartment and just had antenna's in the attic ,
but now having moved to a house in a few months I'll be putting up a
10-160 wire type antenna in my trees. Given the recent spate of serious
thunderstorms, and the accompanying lightning, I'm a bit concerned about
properly grouding the antenna so that I don't fry the house *smile*.

That's a very good concern to have!

I'd encourage you to consult with a local professional (electrician)
who is familar with your local conditions (weather, soil, electrical,
and legal).

I
know about some articles on the ARRL site, but was wondering if anyone
else had some ideas or pointers on how to practically do this ?

You might find it useful to review the following document:

http://www.radagast.org/~dplatt/hamr...-grounding.pdf

It's probably got more information than you want or need, but some
sections of it could be quite useful in planning your system.

Understanding the requirements of your local electrical code (which is
probably based in large part on the National Electric Code) would also
be a good idea. The text of the NEC isn't available online as far as
I know (it's copyrighted) but I understand that most good libraries
should have a copy.

The basic approach you'd want to take, I believe, is to make sure that
the feedline is well grounded immediately before it enters your
building. You'll probably want to hammer in a new ground rod at this
location, in order to keep the distance between grounding point and
ground to a minimum, and if you do so you should/must install a
heavy-gauge "bonding" wire between this ground rod and your building's
main grounding point (probably at the electrical service entrance).

Installing lightning/surge suppressors of one sort or another in the
feedline at the grounding point would also be a good idea. They might
help shunt away a high-voltage spike, induced by a nearby lighting
strike, which could damage your equipment.

If your shack is not on the first floor, it'd probably be a good idea
for you to run the feedline down the wall to ground level, ground it
there, and then run it to the antenna.

You might want to consider an arrangement in which the antenna
feedline drops down from the feedpoint to ground level, is connected
to a ground rod at that point, and then runs along or through the
ground to your house (use a "direct bury" coax, in this case, to avoid
contamination of the cable by soil moisture and chemicals!). This
could help keep direct- or near-direct-strike current away from your
house.

One of the best things you can do is to have some sort of easy-access
connector coupling, located outside the house (e.g. at the grounding
block). If a storm seems imminent, or any time you won't be using the
rig for a while, disconnect the end of the antenna feedline and toss
it away from the house.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

Hi Jerry,

Dave's comments are accurate and helpful, in almost every case.
But there is the possibility of a very substantial simplification here.

The Key Question: Do you need or want to operate your rig during
electrical storms?

If the answer is YES, then you better do everything Dave suggests--
and possibly a whole lot more. Praying a little might also be helpful.

But if the answer is NO, then you would probably do just fine
(with respect to antenna-specific risk) using the last suggestion only:

One of the best things you can do is to have some sort of easy-access
connector coupling, located outside the house (e.g. at the grounding
block). If a storm seems imminent, or any time you won't be using the
rig for a while, disconnect the end of the antenna feedline and toss
it away from the house.

The main thing to remember on this one is that the more CONVENIENT
you make your disconnect, the more likely it will be that you'll actually
USE it appropriately.

73, Ed, W6LOL

For a receiving antenna, a coherer provides excellent lightning
protection.

Unfortuantly, on a transmitting antenna, the rf would immediately make
the coherer conductive and a direct short to ground (perhaps very low
QRP power could be used?)

One can easily be construted with a bottle filled with metal filings,
two bare wires are inserted into the filings (not touching and
seperated by a substantial amount of the filings), one wire goes to a
good earth ground, the other to the antenna.

If the coherer shorts to ground it only needs to be shaken to reset (I
would suspect in a real lightning strike the metal would be fused,
quite possibly even vaporized.)

John

"Jerseyj" wrote in message
...
Hi all,
For years I lived in an apartment and just had antenna's in the
attic ,
but now having moved to a house in a few months I'll be putting up a
10-160 wire type antenna in my trees. Given the recent spate of
serious
thunderstorms, and the accompanying lightning, I'm a bit concerned
about
properly grouding the antenna so that I don't fry the house *smile*.
I
know about some articles on the ARRL site, but was wondering if
anyone
else had some ideas or pointers on how to practically do this ?

Jerry

Interesting, You made me look. (made me Look up coherer, that is).
An invention of Sir Oliver Lodge for detecting rf.
Your idea of using it as a lightning protection device seems to be a
misapplication.
But like I said, until now, I never heard of it.

"John Smith" wrote in message
...
For a receiving antenna, a coherer provides excellent lightning
protection.

Unfortuantly, on a transmitting antenna, the rf would immediately make
the coherer conductive and a direct short to ground (perhaps very low
QRP power could be used?)

One can easily be construted with a bottle filled with metal filings,
two bare wires are inserted into the filings (not touching and
seperated by a substantial amount of the filings), one wire goes to a
good earth ground, the other to the antenna.

If the coherer shorts to ground it only needs to be shaken to reset (I
would suspect in a real lightning strike the metal would be fused,
quite possibly even vaporized.)

John

"Jerseyj" wrote in message
...
Hi all,
For years I lived in an apartment and just had antenna's in the
attic ,
but now having moved to a house in a few months I'll be putting up a
10-160 wire type antenna in my trees. Given the recent spate of
serious
thunderstorms, and the accompanying lightning, I'm a bit concerned
about
properly grouding the antenna so that I don't fry the house *smile*.
I
know about some articles on the ARRL site, but was wondering if
anyone
else had some ideas or pointers on how to practically do this ?

Jerry

Hal:

Actually, I have used the coherer on receiving antennas, in a couple
of lightning storms it has indeed shorted to ground and needed to be
shaken to restore the signals from the antenna (NOTHING near a direct
hit and this is central cal, not much lightning and of little
significance.)

Presently, I use MOV's... at best, -=maybe=-, better than nothing...

John

"Hal Rosser" wrote in message
.. .
Interesting, You made me look. (made me Look up coherer, that is).
An invention of Sir Oliver Lodge for detecting rf.
Your idea of using it as a lightning protection device seems to be a
misapplication.
But like I said, until now, I never heard of it.

"John Smith" wrote in message
...
For a receiving antenna, a coherer provides excellent lightning
protection.

Unfortuantly, on a transmitting antenna, the rf would immediately
make
the coherer conductive and a direct short to ground (perhaps very
low
QRP power could be used?)

One can easily be construted with a bottle filled with metal
filings,
two bare wires are inserted into the filings (not touching and
seperated by a substantial amount of the filings), one wire goes to
a
good earth ground, the other to the antenna.

If the coherer shorts to ground it only needs to be shaken to reset
(I
would suspect in a real lightning strike the metal would be fused,
quite possibly even vaporized.)

John

"Jerseyj" wrote in message
...
Hi all,
For years I lived in an apartment and just had antenna's in the
attic ,
but now having moved to a house in a few months I'll be putting
up a
10-160 wire type antenna in my trees. Given the recent spate of
serious
thunderstorms, and the accompanying lightning, I'm a bit
concerned
about
properly grouding the antenna so that I don't fry the house
*smile*.
I
know about some articles on the ARRL site, but was wondering if
anyone
else had some ideas or pointers on how to practically do this ?

Jerry

On Sun, 17 Jul 2005 08:07:15 -0400, Jerseyj
wrote:

Hi all,
For years I lived in an apartment and just had antenna's in the attic ,
but now having moved to a house in a few months I'll be putting up a
10-160 wire type antenna in my trees.

I have a 10-80 wire connected between 3 trees. It's fed with
ladderline. Lightning protection is simple -- with banana plugs and
jacks, I can unplug the ladderline just outside the window whenever it
looks rainy.

You might think about whether you want to use coax or some kind of
balanced line -- balanced line is a simple disconnect.

bob
k5qwg

Given the recent spate of serious
thunderstorms, and the accompanying lightning, I'm a bit concerned about
properly grouding the antenna so that I don't fry the house *smile*. I
know about some articles on the ARRL site, but was wondering if anyone
else had some ideas or pointers on how to practically do this ?

Jerry

Jerry - I'll second that idea. I use banana plugs on the balanced feedline
from my inverted V wire antenna. If the weather looks like it might get
bad, I just unplug it from my transmatch and throw it out the window (the
feedline - not the transmatch!)

Warren KC8YKQ


Bob Miller wrote in
news
I have a 10-80 wire connected between 3 trees. It's fed with
ladderline. Lightning protection is simple -- with banana plugs and
jacks, I can unplug the ladderline just outside the window whenever it
looks rainy.

"Jerseyj" wrote in message
...
Hi all,
For years I lived in an apartment and just had antenna's in the attic ,
but now having moved to a house in a few months I'll be putting up a
10-160 wire type antenna in my trees. Given the recent spate of serious
thunderstorms, and the accompanying lightning, I'm a bit concerned about
properly grouding the antenna so that I don't fry the house *smile*. I
know about some articles on the ARRL site, but was wondering if anyone
else had some ideas or pointers on how to practically do this ?

HI,

Good to read : http://www.astrosurf.org/lombry/qsl-...protection.htm

Personnaly, in my humble opinion, under thundery weather there is no better
solution than unpluging all electronic devices...

Thierry, ON4SKY


Jerry