On 26 November 2012 15:44, Peter G. Viscarola pete...@osr.com wrote:
Hi TimeNuts,
What are people using for surge arresters between your GPS receiver and the
antenna, at the entrance to your house?
Several years ago there was lightning near my house, which I think
went on the telephone
On 27 November 2012 09:15, David Kirkby david.kir...@onetel.net wrote:
If I was reallly concerned, then I'd look at using an optical
interace. Use a battery to power the GPS antenna, modulate a laser and
detect the RF on a photodiode connected by a metre of so of optical
fibre.
Of course, I
You really can't protect yourself from a direct strike. But that is rare.
More common is a close strike.
You first line of defense is to ground the metal mast (pipe). Place a
ground clamp on the pipe and run a large ground write by the most direct
route to a ground rod driven into the soil.
Hi TimeNuts,
What are people using for surge arresters between your GPS receiver and the
antenna, at the entrance to your house?
I've got an entrance panel set up for HF, with copper ribbon to two ground
rods. I'd like to add a connection for my GPSDO.
I know the frequency is about 1.6GHz,
included
the ground strapping and various other useful bits and pieces.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Peter G. Viscarola
Sent: Monday, November 26, 2012 10:45 AM
To: time-nuts@febo.com
Subject: [time-nuts] Surge
There really isn't anything that will protect your
receiver if the antenna takes a strike. But, if
you pass the coax into your house using a well
grounded bulkhead connector, you can protect your
house.
I got one GPS antenna that had an EMP protector
attached to it (came from NSA)... since the
I don't use one on my gpsdo feed line. The shield of the feed line is
grounded prior to it entering the house and I don't live in a lightning prone
area. The gps antenna I use apparently has diode protection to provide some
immunity to near by lightning strikes. Most of my radio antennas
I have a box-full of GPS protectors that were built by a company called
ZapTech. They are just coaxial gas tubes that seem to have a strike voltage
around 60-90 volts. We replaced them with (MUCH) more expensive PolyPhaser
units. I use the ZapTechs on all of my long (600-800 ft) low-freq receiving
There's not much in this world that is able to reliably protect a radios
input from a direct lightning hit (maybe a block of copper instead of
the antenna...). But a surge protector (sometimes called EMP protector
or surge arrester) can increase the probability that a nearby lightning
strike
Cable question: I assume that won't be the problem. I use my 26dB
Trimble timing antenna with RG-213 because of the low loss (and the low
cost). Before that I had 15 m (45 feet) of RG-58 combined with a car
roof magnetic patch antenna in use without any problem. Any 50 Ohm cable
can be used,
26, 2012 2:38 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Surge Arresters
Cable question: I assume that won't be the problem. I use my 26dB
Trimble timing antenna with RG-213 because of the low loss (and the low
cost). Before that I had 15 m (45 feet
Unfortunately, many of the surge arresters available on ebay do not pass DC
or have a DC shunt to ground internally. This means they won't work with an
amplified antenna. Make sure any suppressor you get will pass the DC current
to the antenna.
Al, K9SI, retired
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