Chris Albertson wrote:
On Thu, Oct 16, 2014 at 7:51 PM, Dave M dgmin...@mediacombb.net
wrote:
Thanks, Chris.
I've done a bit or research on the subject, and think I have a
reasonable grip on the necessary steps. I have an 8' ground rod
driven into the ground directly under the spot where my
, October 18, 2014 12:48 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lightning arrestors for GPSDO antenna
Chris Albertson wrote:
On Thu, Oct 16, 2014 at 7:51 PM, Dave M dgmin...@mediacombb.net
wrote:
Thanks, Chris.
I've done a bit or research on the subject
On 10/18/14, 2:05 PM, Bill Hawkins wrote:
FWIW, when grounding the metal mast of a boat, three inch wide copper
strap is used because it is a better RF conductor. The strap is
available
in marine supply stores.
It's actually more about being convenient to install, and tradition.
If you have a
John Allen wrote:
Hello All - There is a 500+ page document on grounding, lightning
protection and more - Google for:
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES Motorola R56 2005
Regards, John K1AE
Great document! Thanks for the link
Dave M
If anyone is interested, I have a few NOS Zap-Tech 30-105 (now called CX-TF
apparently) surge suppressors available. These are basically a single shunt
gas tube (the coaxial center conductor runs through the center of a custom
gas tube), and they were sold as GPS in-line suppressors. I use them at
Hello Dave,
I think we had a similar question recently - and I have been told the
PolyPhaser products are gas tubes - I haven't opened one up yet.
TESSCO sells these online - you can find them here:
https://www.tessco.com/products/displayProducts.do?groupId=90143subgroupId=91046
Regards,
John W.
On Thu, Oct 16, 2014 at 7:51 PM, Dave M dgmin...@mediacombb.net wrote:
Thanks, Chris.
I've done a bit or research on the subject, and think I have a reasonable
grip on the necessary steps. I have an 8' ground rod driven into the
ground directly under the spot where my antennas mount. #6
On 10/17/14, 6:26 AM, Chris Albertson wrote:
On Thu, Oct 16, 2014 at 7:51 PM, Dave M dgmin...@mediacombb.net wrote:
Thanks, Chris.
I've done a bit or research on the subject, and think I have a reasonable
grip on the necessary steps. I have an 8' ground rod driven into the
ground directly
You can use metal conduit as the bonding conductor between grounding
systems, for one thing.
That works fine, but I think it is disallowed by the electrical code. If
you used metallic conduit it MUST be grounded but you can't use it for
grounding. That said, it does work. I think the
Dave,
We have a 26 dB Lucent (TMG-HR-26NCM) antenna mounted on the gable end
of the N2MO station. The feed line (1/2 superflex) runs straight down
to a watertight steel box with a Polyphaser GPS protector. The
superflex shield is tied to the ground with the standard Andrew kit.
Both the
On 10/17/14, 8:17 AM, Chris Albertson wrote:
You can use metal conduit as the bonding conductor between grounding
systems, for one thing.
That works fine, but I think it is disallowed by the electrical code. If
you used metallic conduit it MUST be grounded but you can't use it for
Hello All - There is a 500+ page document on grounding, lightning protection
and more - Google for:
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES Motorola R56 2005
Regards, John K1AE
___
time-nuts mailing list -- time-nuts@febo.com
To
All:
Some very good information here.
I use NFPA codes in my day job.
JUST YESTERDAY, I learned that you can read their standards for free.
Go to their site, and you'll see a link for free access to any of their
standards. You can't save or print, but you can read. You will have to
create
I'm looking for effective coaxial lightning arrestors for my GPSDO antennas.
I've seen several types; those completely enclosed in a one-piece metal
enclosure (no replaceable components) and those having a replaceable gas
discharge tube seem to predominate the list.
I'm looking closely at the
Hi
There are a number of them on the auction sites. They are fairly specific in
terms of frequency band and application.
Bob
On Oct 16, 2014, at 7:34 PM, Dave M dgmin...@mediacombb.net wrote:
I'm looking for effective coaxial lightning arrestors for my GPSDO antennas.
I've seen several
Lightening arrestors are an important part of a protection system but just
installing some in the antenna cable is not going to help so much. You
need a system approach. If you do it right you can take a direct hit
The big problem with grounding is Ohm's Law. That is if any current flows
in a
Thanks, Chris.
I've done a bit or research on the subject, and think I have a reasonable
grip on the necessary steps. I have an 8' ground rod driven into the ground
directly under the spot where my antennas mount. #6 solid copper from the
rod to a heavy aluminum plate, where the arrestors
On 10/16/14, 6:27 PM, Chris Albertson wrote:
Lightening arrestors are an important part of a protection system but just
installing some in the antenna cable is not going to help so much. You
need a system approach. If you do it right you can take a direct hit
The big problem with grounding is
Years ago, I visited an installation that used a large triggered spark
gap to discharge a large bank of caps at 100 KV into the primary of an
air wound (about 8 feet in diameter) 1:10 step up pulse transformer
connected to two aluminum plates about 30 feet square separated by
several feet of water
Of all device types, I think gas tubes are the best for this sort of
application - very low C, and high surge current rating. I'm
picturing the kind that are used in power supplies and such for
limiting line transients - about 1 cm dia and length with axial
leads. I don't know what kind are
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