Re: [time-nuts] GPS antenna selection - lightning

Hi We tend to look at all this lighting / EMP stuff very much as a “get to the ground” sort of thing. For whatever reason the whole thought process stops once we get to a coper weld rod driven however far into the dirt. If you try to operate a vertical antenna against that same rod in the

Re: [time-nuts] GPS antenna selection - lightning

On 8/7/16 8:06 PM, Bill Hawkins wrote: This thread grows old, so here's one person's summary: Marine supply stores sell rolls of 4 inch wide copper strap for connecting the mast on the wheelhouse cabin with the keel of fiberglass boats. This is also the ground for all electronic equipment. The

Re: [time-nuts] GPS antenna selection - lightning

com> Sent: Sunday, August 7, 2016 10:06 PM Subject: Re: [time-nuts] GPS antenna selection - lightning This thread grows old, so here's one person's summary: There are two ways to be damaged by lightning: 1. A direct hit pumps 100 kiloamps of electrons into an ohm or so of your local w

Re: [time-nuts] GPS antenna selection - lightning

This thread grows old, so here's one person's summary: There are two ways to be damaged by lightning: 1. A direct hit pumps 100 kiloamps of electrons into an ohm or so of your local wiring. There is no way to survive a direct hit except to implement stuff only the Military can afford. The

Re: [time-nuts] GPS antenna selection - lightning

On Sat, Aug 6, 2016 at 12:53 PM, Glenn Little WB4UIV < glennmaill...@bellsouth.net> wrote: > The latest that I can find is 1987. > If you understand the theory and practice, you do not have to update your > work often. > It is the works that are updated every few months that you have to worry >

Re: [time-nuts] GPS antenna selection - lightning

just interesting behavior. Best regards, Bill Hawkins -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Glenn Little WB4UIV Sent: Friday, August 05, 2016 9:47 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts]GPS antenna selec

Re: [time-nuts] GPS antenna selection - lightning

t;> Coonts' books, if my failing memory recalls correctly. And so I learned > >> what I could about EMP. Never built anything, just interesting behavior. > >> > >> Best regards, > >> Bill Hawkins > >> > >> > >> -Original Messag

Re: [time-nuts] GPS antenna selection - lightning

ng, just interesting behavior. >> >> Best regards, >> Bill Hawkins >> >> >> -Original Message- >> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Glenn >> Little WB4UIV >> Sent: Friday, August 05, 2016 9:47 PM >> To: Di

Re: [time-nuts] GPS antenna selection - lightning

f Of Glenn Little WB4UIV Sent: Friday, August 05, 2016 9:47 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts]GPS antenna selection - lightning A very good reference for EMP protection is MIL-HDBK-419. This is downloadable for a number of web sources. It is about

Re: [time-nuts] GPS antenna selection — lightning

Glenn wrote: A very good reference for EMP protection is MIL-HDBK-419. This is downloadable for a number of web sources. Tisha Hayes has a big fat folder full of good stuff relating to "Grounding Surge and Filtering" at her dropbox site, and another one full of "Transient Protection

[time-nuts] GPS antenna selection — lightning

>From UL "Lightning Protection (2016): "When we look at a Lightning Protection System in its most elementary form, it is quite simple. An air terminal(s) to attract and catch a lightning strike, a low resistance conducting cable that connects the air terminal to the earth using a conducting

Re: [time-nuts] GPS antenna selection — lightning

Hi Ummm ….. It’s a *lot* more fun to focus on the 0.001% case :) Bob > On Aug 5, 2016, at 9:31 PM, Chris Albertson wrote: > > You guys, well some of you are mixing to things > > 1) the building code requirement to ground an antenna is for the protection > of the

Re: [time-nuts] GPS antenna selection — lightning

A very good reference for EMP protection is MIL-HDBK-419. This is downloadable for a number of web sources. It is about 600 pages and is in two volumes. This discusses a number of different sources of EMP such as nuclear and lightning. A lot is for protection of military industrial complexes,

Re: [time-nuts] GPS antenna selection — lightning

You guys, well some of you are mixing to things 1) the building code requirement to ground an antenna is for the protection of the building. The building code don't care if you electronics is fried or not. The wire and ground rod keep the antenna mast at earth potential. 2) Those surge

Re: [time-nuts] GPS antenna selection

Herbert Poetzl wrote: > I'm currently investigating my options regarding > GPS antennae (of course for time related purposes) > and I'm really confused by the variety they come > in ... (my apologies in advance for the long post). Yes, lots of variety! See: http://leapsecond.com/museum/gps-ant/

Re: [time-nuts] GPS antenna selection — lightning

lightening protection: http://www.ul.com/wp-content/uploads/2014/04/LightningProtectionAG.pdf 73 KJ6UHN Alex On 8/5/2016 1:51 PM, Attila Kinali wrote: Hi Eric, On Fri, 5 Aug 2016 10:37:28 -0400 Eric Scace wrote: A GPS antenna and its coax line that is installed next to a

Re: [time-nuts] GPS antenna selection — lightning

Flying a plane with a plexiglas windshield through a snowstorm will give you a lightning show on your windshield. Willy On 8/5/2016 10:37 AM, Eric Scace wrote: Unfortunately, an antenna, cable, or piece of electronics located indoors is just as susceptible to lightning surges as one that is

Re: [time-nuts] GPS antenna selection — lightning

Yo Attila! On Fri, 5 Aug 2016 22:51:06 +0200 Attila Kinali wrote: > While it is true, that an indoor antenna is suceptible to surges like > an outdoor antenna, it is not true that an outdoor antenna is > equivalent to an indoor antenna when it comes to lightning > protection.

Re: [time-nuts] GPS antenna selection — lightning

Hi Eric, On Fri, 5 Aug 2016 10:37:28 -0400 Eric Scace wrote: > A GPS antenna and its coax line that is installed next to a window is no > different from the same antenna/coax installed one meter outside the window… > or 10 meters away outside the window. All three

Re: [time-nuts] GPS antenna selection — lightning

On 08/05/2016 01:45 PM, Bob Camp wrote: A ten foot long antenna cable is no more or less an issue indoors than a ten foot serial cable to a laptop or a ten foot test lead running off of a DVM. They all will pick up a spike if the field is strong enough. If you are in a high risk location,

Re: [time-nuts] GPS antenna selection

If you use plastic then paint it. UV light from the sun makes it brittle. Plastic electrical conduit however is UV proof I used larger size metal with a 3/4 x 1 fiting How to ground a plastic mast? You'd need a ground block like the cable TV guys use. But with steel mast you put a clamp

Re: [time-nuts] GPS antenna selection — lightning

Hi A ten foot long antenna cable is no more or less an issue indoors than a ten foot serial cable to a laptop or a ten foot test lead running off of a DVM. They all will pick up a spike if the field is strong enough. If you are in a high risk location, then yes you will need to go to extremes

Re: [time-nuts] GPS antenna selection — lightning

Unfortunately, an antenna, cable, or piece of electronics located indoors is just as susceptible to lightning surges as one that is outdoors. Lightning-induced surges couple into these systems electromagnetically across a wide range (VLF to SHF) of frequencies. When you think about your home

Re: [time-nuts] GPS antenna selection

hol...@hotmail.com said: > You might want to try a modern GPS receiver. I have some cheap (< $10-20) > GPS modules with on board patch antennas that work indoors, sitting on the > floor of the bottom level of a two story stucco-over-wire mesh house, away > from windows, surrounded on all

Re: [time-nuts] GPS antenna selection

albertson.ch...@gmail.com said: > Next You want one that will last basically "forever" outdoors. The best > kind have a plastic radome over a metal base. The base has pipe threads for > mounting on a standard 3/4" galvanized plumbing pipe. The coax wires goes > down this pie and never sees the

Re: [time-nuts] GPS antenna selection

>> The real question is how much of a sky view you get. > >> Ideally you would like a clear view of the sky from >> about NE clear around to NW (270 degrees). > > That would opt for the balcony, as it faces north > and extends the slanted roof, so basically clear > view from NE to NW down to the

Re: [time-nuts] GPS antenna selection

Dear fellow time-nuts! I'm currently investigating my options regarding GPS antennae (of course for time related purposes) and I'm really confused by the variety they come in ... (my apologies in advance for the long post). [] Many thanks in advance and my apologies again for the rather lengthy

[time-nuts] GPS antenna selection

I just did a test on my cheapest (3 for $15-$20) GPS module... a V.KEL Sirf III receiver. Indoors, on the lower level floor, away from windows, etc. I was getting 25-35 dBc levels with the patch antenna properly oriented. With the module flipped over and the antenna surface on a hardwood

Re: [time-nuts] GPS antenna selection

I just wrote that the type of cable hardly matters. I did not think anyone would try to use RG174. That is for 1 foot long jumper cables and oscilloscope probes at most. If cost is an issue the 75ohm cable TV wire is cheap and works better then that tiny sized rg175. There is no need to buy

Re: [time-nuts] GPS antenna selection

What matters more than anything else is how good is the view of the sky. Next You want one that will last basically "forever" outdoors. The best kind have a plastic radome over a metal base. The base has pipe threads for mounting on a standard 3/4" galvanized plumbing pipe. The coax wires goes

[time-nuts] GPS antenna selection

You might want to try a modern GPS receiver. I have some cheap (< $10-20) GPS modules with on board patch antennas that work indoors, sitting on the floor of the bottom level of a two story stucco-over-wire mesh house, away from windows, surrounded on all sides by tall trees, with the

Re: [time-nuts] GPS antenna selection

On Thu, 04 Aug 2016 23:29:06 +0200, Herbert Poetzl wrote: > Dear fellow time-nuts! > > I'm currently investigating my options regarding GPS antennae (of course > for time related purposes) > and I'm really confused by the variety they come in ... (my apologies in > advance for the long post). >

Re: [time-nuts] GPS antenna selection

herb...@13thfloor.at said: >> Ideally you would like a clear view of the sky from >> about NE clear around to NW (270 degrees). > That would opt for the balcony, as it faces north and extends the slanted > roof, so basically clear view from NE to NW down to the horizon. You are thinking the

Re: [time-nuts] GPS antenna selection

On Thu, Aug 04, 2016 at 06:26:28PM -0400, Bob Camp wrote: > Hi Hey Bob! >> On Aug 4, 2016, at 5:29 PM, Herbert Poetzl wrote: >> Dear fellow time-nuts! >> I'm currently investigating my options regarding >> GPS antennae (of course for time related purposes) >> and I'm

Re: [time-nuts] GPS antenna selection

Hi > On Aug 4, 2016, at 7:26 PM, Herbert Poetzl wrote: > > On Thu, Aug 04, 2016 at 06:26:28PM -0400, Bob Camp wrote: >> Hi > > Hey Bob! > >>> On Aug 4, 2016, at 5:29 PM, Herbert Poetzl wrote: > >>> Dear fellow time-nuts! > >>> I'm currently

Re: [time-nuts] GPS antenna selection

Do you have a picture of the balcony? - Original Message - From: "Herbert Poetzl" <herb...@13thfloor.at> To: <time-nuts@febo.com> Sent: Thursday, August 04, 2016 5:29 PM Subject: [time-nuts] GPS antenna selection Dear fellow time-nuts! I'm currently in

Re: [time-nuts] GPS antenna selection

Hi > On Aug 4, 2016, at 5:29 PM, Herbert Poetzl wrote: > > > Dear fellow time-nuts! > > I'm currently investigating my options regarding > GPS antennae (of course for time related purposes) > and I'm really confused by the variety they come > in ... (my apologies in

Re: [time-nuts] GPS antenna selection

Hi Herbert, just look the loss of the cable at 1500 MHz, and you will start to cry at 1500MHz tha cable will have cca 30dB for a 30meter long piecebasically that RG174 looks very nice with that small antenna but that is the only positive aspect. Meinberg in Germany has one up/down

[time-nuts] GPS antenna selection

Dear fellow time-nuts! I'm currently investigating my options regarding GPS antennae (of course for time related purposes) and I'm really confused by the variety they come in ... (my apologies in advance for the long post). Setting: I'm living in a three storey house with a sloped roof, a