On 11/27/2014 01:10 AM, Jim Lux wrote:
On 11/26/14, 2:54 PM, Hal Murray wrote:
albertson.ch...@gmail.com said:
The ground rod needs to be bonded to the rest of the building ground
system.
How do I do that effectively if the power goes in the front of the
building
and the antenna is on the
Hi
Ok, here’s the full and proper answer to the question. Anything less is simply
not adequate:
1) Lay down some ground cables, say a few thousand of them. Run them out at
least 1/4 mile in each direction from your structure. Make sure they are at
least 00 gauge and buried 10 feet deep.
2)
Bob,
can you explain more about the effect of antenna performance on a GPSDO
system?
Now you have told me it is important, I would like to know more! My lab
has an East facing window.
Physically what is happening here is that the error bars on the fix your
GPS gets will cycle over a 12
Hi
The 12 hour periodicity of GPS is (in general) less obvious in an ADEV plot
than 24 and 48 hour effects. Part of this is due to the lower “floor” at longer
tau. Another part of it is due to things like the ionosphere being at
different places at the 12 hour points.
Bob
On Dec 7, 2014,
The topic has shifted from lightning protection, but I thought I would
share my experiences on diurnal timing shifts.
On my home-built GPSDO, similar to the design posted by Lars Walenius some
time ago, I can see variations in the TIC output that correlate well to to
the variations 24 hours ago.
Hi
If you are happy with 1x10^ -9 frequency accuracy, then there are a number of
things you can ignore. If you are after 1x10^-11 frequency accuracy 99.9% of
the time you have to do everything right. Different limits apply to different
measures of stability.
To reduce multi path you need a
measurement
time-nuts@febo.com
Subject: Re: [time-nuts] lightening protection of a GPSDO system /
optical isolated distribution amp
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canx10hcsk_lbhwx3azgr0a4ejqzsschfir2wv8fdznsxns2...@mail.gmail.com
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On 27 Nov 2014 03:06, Bob
Said mentioned on an earlier thread that if a GPS antenna is used
outside, lightening protection should be used. This immediately
reminded me of something that happened about 10 years ago to me
1) Lightening damaged my ADSL modem. It because totally dead.
2) Every computer and a printer connected
The N2MO station has an external GPS antenna on the gable end of the
building. It's connected to the polyphaser arrestor with FSJ4-50
superflex.
The antenna mounting pipe has a #2 ground wire (33.6 mm/2) the
polyphaser has it's own #2 ground wire. Both connect to an 8' x 5/8
(2.4m x
On 11/26/14, 1:37 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
Said mentioned on an earlier thread that if a GPS antenna is used
outside, lightening protection should be used. This immediately
reminded me of something that happened about 10 years ago to me
1) Lightening damaged my ADSL
On 11/26/14, 2:00 PM, Martin A Flynn wrote:
The N2MO station has an external GPS antenna on the gable end of the
building. It's connected to the polyphaser arrestor with FSJ4-50
superflex.
The antenna mounting pipe has a #2 ground wire (33.6 mm/2) the
polyphaser has it's own #2 ground wire.
You CAN (almost) lightening proof your system. The trick is to give
lightening a low impedence path to grind at very opportunity.
Start with the antenna mast and call. Use iron pipe for the mast and feed
the antenna cable down the center of the pipe. Place two large ground
clamps on this pipe
albertson.ch...@gmail.com said:
The ground rod needs to be bonded to the rest of the building ground system.
How do I do that effectively if the power goes in the front of the building
and the antenna is on the back?
--
These are my opinions. I hate spam.
On 11/26/2014 5:14 PM, Jim Lux wrote:
On 11/26/14, 2:00 PM, Martin A Flynn wrote:
The N2MO station has an external GPS antenna on the gable end of the
building. It's connected to the polyphaser arrestor with FSJ4-50
superflex.
The antenna mounting pipe has a #2 ground wire (33.6 mm/2) the
On 26 November 2014 at 22:14, Chris Albertson albertson.ch...@gmail.com wrote:
You CAN (almost) lightening proof your system.
BUT if the almost is not quite enough, one could damage a lot of
expensive test kit.
Remember that Ethernet is always
gavalically isolated by transformers
I lost
On 11/26/2014 5:54 PM, Hal Murray wrote:
albertson.ch...@gmail.com said:
The ground rod needs to be bonded to the rest of the building ground system.
How do I do that effectively if the power goes in the front of the building
and the antenna is on the back?
If cost is no object, a ring ground
Subject: Re: [time-nuts] lightening protection of a GPSDO system / optical
isolated distribution amp
albertson.ch...@gmail.com said:
The ground rod needs to be bonded to the rest of the building ground system.
How do I do that effectively if the power goes in the front of the building
On 11/26/14, 2:14 PM, Chris Albertson wrote:
You CAN (almost) lightening proof your system. The trick is to give
lightening a low impedence path to grind at very opportunity.
Start with the antenna mast and call. Use iron pipe for the mast and feed
the antenna cable down the center of the
On 11/26/14, 2:54 PM, Hal Murray wrote:
albertson.ch...@gmail.com said:
The ground rod needs to be bonded to the rest of the building ground system.
How do I do that effectively if the power goes in the front of the building
and the antenna is on the back?
AWG 6 wire with no breaks or
Here is a link to a good 12 page description of grounding
practices/requirements.
http://www.reeve.com/Documents/Articles%20Papers/AntennaSystemGroundingRequirements_Reeve.pdf
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You really do have to bond the two of them. The VERY best way is to dig a
trench all the way around the building and install a loop of wire, #8 at
least (although I use much larger wire after the time and money to dug a
trench.) This wire connects the rods and the water system. While a full
On 27 Nov 2014 01:14, Chris Albertson albertson.ch...@gmail.com wrote:
After this minimum you have th think about the probability of a strike.
If
you live in Orlando Florida then it might be 100% and nearly zero in other
places and then you ask what the radio equipment cost. I paid $18 for
On 11/26/14, 5:23 PM, Chris Albertson wrote:
On Wed, Nov 26, 2014 at 4:03 PM, Jim Lux jim...@earthlink.net wrote:
On 11/26/14, 2:14 PM, Chris Albertson wrote:
You CAN (almost) lightening proof your system. The trick is to give
lightening a low impedence path to grind at very opportunity.
Sweet. I settled on #3 copper for my antenna grounding system on economic
grounds and had a debate with a residential electrical contractor about
bonding the antenna ground to the electrical service ground. The city
inspector passed the system with the bond installed.
I haven't used poly
In my opinion,
I'd be inclined to find a way to run a suitable wire around the building.I
don't think you want your interior electrical wiring serving as the only bond
between two different grounds if energy from a lightning strike flows thru your
antenna feed line and then thru your time
Hi
You need a good antenna setup to get a good disciplined oscillator. The bigger
question is if you *need* the sort of “better” it gives you. If you are running
a simple TCXO based GPSDO, you will have a number of issues to deal with
compared to an OCXO or Rb based system. If “better” is an
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