Re: [time-nuts] GPS ANTENNA

: 01 April 2018 23:29 > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] GPS ANTENNA > > An unusual attenuator with a DC pass. > > On Sun, Apr 1, 2018 at 10:21 PM, David C. Partridge > <david.partri...@perdrix.co.uk> wrote: >> O

Re: [time-nuts] GPS ANTENNA

ecise time and frequency measurement > Subject: Re: [time-nuts] GPS ANTENNA > > An unusual attenuator with a DC pass. > > On Sun, Apr 1, 2018 at 10:21 PM, David C. Partridge > <david.partri...@perdrix.co.uk> wrote: >> Or use a choke ring survey antenna and an attenuator :

Re: [time-nuts] GPS ANTENNA

] On Behalf Of Azelio Boriani Sent: 01 April 2018 23:29 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] GPS ANTENNA An unusual attenuator with a DC pass. On Sun, Apr 1, 2018 at 10:21 PM, David C. Partridge <david.partri...@perdrix.co.uk> wrote: > Or use a c

Re: [time-nuts] GPS ANTENNA

a bias tee to feed in the antenna volts :) > > -Original Message- > From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Azelio > Boriani > Sent: 01 April 2018 23:29 > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts]

[time-nuts] GPS antenna gain

I had the misfortune of using those very PCTEL antennas in a timing application and excessive gain was a problem with the loss of frame sync whenever the receiver had too much signal from any satellite. It was a highly intermittent problem that appeared every few days; always after I had tested

Re: [time-nuts] GPS ANTENNA

just use a bias tee to feed in the antenna volts :) -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Azelio Boriani Sent: 01 April 2018 23:29 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] GPS ANTENNA An unusual

Re: [time-nuts] GPS ANTENNA

From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of > > Bob kb8tq > > Sent: 01 April 2018 14:43 > > To: Discussion of precise time and frequency measurement > > Subject: Re: [time-nuts] GPS ANTENNA > > > > Hi > &g

Re: [time-nuts] GPS ANTENNA

nna and an attenuator :) >> >> Dave >> >> -Original Message- >> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob kb8tq >> Sent: 01 April 2018 14:43 >> To: Discussion of precise time and frequency measurement >> Subject: Re: [t

Re: [time-nuts] GPS ANTENNA

vey antenna and an attenuator :) Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob kb8tq Sent: 01 April 2018 14:43 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] GPS ANTENNA Hi Indeed, it is *very* easy to put to much ga

Re: [time-nuts] GPS ANTENNA

bo.com] On Behalf Of Bob kb8tq > Sent: 01 April 2018 14:43 > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] GPS ANTENNA > > Hi > > Indeed, it is *very* easy to put to much gain in front of a timing GNSS > receiver. These beasts are tr

Re: [time-nuts] GPS ANTENNA

Or use a choke ring survey antenna and an attenuator :) Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob kb8tq Sent: 01 April 2018 14:43 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] GPS ANTENNA Hi Indeed

Re: [time-nuts] GPS ANTENNA

Hi Indeed, it is *very* easy to put to much gain in front of a timing GNSS receiver. These beasts are trying to dig out a signal that you can’t even see with a spectrum analyzer. It’s way to far below the noise floor to detect that way. They optimize things pretty tightly to get that done

Re: [time-nuts] GPS ANTENNA

On Sat, 31 Mar 2018 10:58:19 -0500, donandarline-Re5JQEeQqe8AvxtiuMwx3w wrote: > I found a supplier for high quality GPS antennas at a very reasonable > price. PCTEL GPSL1-TMG-SPI-40NCB. *** SNIP *** I had one of those on 25m cable, and it worked fine on a Tbolt , until i got an active antenna

[time-nuts] GPS ANTENNA

I found a supplier for high quality GPS antennas at a very reasonable price. PCTEL GPSL1-TMG-SPI-40NCB. They have other ones too. I bought one and it works great. New in the box, never opened. The only thing wrong was the 4 base mounting screws were too short (no big deal). They are on Ebay #

Re: [time-nuts] GPS Antenna Feed Line Decision

Hi > On Sep 5, 2017, at 5:19 PM, Charles Steinmetz wrote: > > Mike wrote: > >> I tried to see if there was any difference in the signal quality reported by >> Motorola UT+ and U-Blox Neo 6M (not timing grade but has a good 1PPS) over >> 30m of 2 different cable types.

Re: [time-nuts] GPS Antenna Feed Line Decision

Mike wrote: I tried to see if there was any difference in the signal quality reported by Motorola UT+ and U-Blox Neo 6M (not timing grade but has a good 1PPS) over 30m of 2 different cable types. I only had RG58(75 Ohm) and RG174(50 Ohm). RG58 is 50 ohm. RG59 is the "equivalent" 75-ohm

Re: [time-nuts] GPS Antenna Feed Line Decision

> Le 5 sept. 2017 à 16:17, Bob kb8tq a écrit : > > Hi > > > >> On Sep 5, 2017, at 6:06 AM, Hal Murray wrote: >> >> >> Clay Autery said: >>> I will use something better than RG-59 or RG-6 (even if it is only "better" >>> in my

Re: [time-nuts] GPS Antenna Feed Line Decision

Hi > On Sep 5, 2017, at 6:06 AM, Hal Murray wrote: > > > Clay Autery said: >> I will use something better than RG-59 or RG-6 (even if it is only "better" >> in my opinion). > > Crazy thought department. Can you also run a parallel run of RG-6

Re: [time-nuts] GPS Antenna Feed Line Decision

Clay Autery said: > I will use something better than RG-59 or RG-6 (even if it is only "better" > in my opinion). Crazy thought department. Can you also run a parallel run of RG-6 and run some tests to see if you can measure the difference? -- These are my opinions. I

Re: [time-nuts] GPS Antenna Feed Line Decision

I'm dating myself again but when I was employed at Hughes Aircraft we had an HP salesman dedicated to servicing just us.  So most everything came direct from them or Wiltron.  I liked traveling to HP events with him.  Hughes had a miserly expense reporting process.  His was, "I count the money

Re: [time-nuts] GPS Antenna Feed Line Decision

Hi A lot depends on just which outfit you buy your attenuators from. There certainly *are* outfits out there that supply you just over 20 db RL when the spec is 20. They also don’t charge very much for their attenuators …. Bob > On Sep 4, 2017, at 4:53 PM, jimlux wrote:

Re: [time-nuts] GPS Antenna Feed Line Decision

On 9/4/17 1:18 PM, Wes wrote: If these are COTS attenuators, their own return loss is unlikely to be 40 dB. In fact grabbing an old HP catalog off my bookshelf (I'm dating myself) I see a typical type N attenuator specified as 1.2 VSWR (~21 dB RL). I went on a quick "shopping" trip looking

Re: [time-nuts] GPS Antenna Feed Line Decision

Not being as nutty as many on this list I only skimmed the papers you provided.  Interesting and I will stand corrected regarding the use of 75 ohm cable in 50 ohm systems in critical situations.  In situations like my own, I'm not going to fuss about it. I realize this is NIST, the 1384

Re: [time-nuts] GPS Antenna Feed Line Decision

Although not time nuts related I believe this document speaks to some of the practical issues... http://www.slac.stanford.edu/cgi-wrap/getdoc/slac-pub-6297.pdf Mark Spencer m...@alignedsolutions.com > On Sep 3, 2017, at 4:56 PM, Mark Sims wrote: > > Real time nuts run

[time-nuts] GPS Antenna Feed Line Decision

Real time nuts run phase stable cable (some well over $50 / foot) in climate controlled ducts... which is all for nought unless you also climate control the antenna.Which is all standard practice for precision geodesy. Try to keep it all with a milli-Kelvin or two. Oh, and don't forget

Re: [time-nuts] GPS Antenna Feed Line Decision

Hi If you are running into a TBolt, it’s got an F connector and 75 ohm cable spec’d already …. The 50 ohm / 75 ohm thing didn’t seem to bother Trimble. They certainly looked at it before going that way …. Bob > On Sep 4, 2017, at 12:31 AM, Ian Stirling wrote: > > On

Re: [time-nuts] GPS Antenna Feed Line Decision

On 09/02/2017 02:57 PM, Clay Autery wrote: > Having decision-making problems for the materials for my GPS main > feedline. Going to use a TM LMR stock, just can't decide how big to go > with it... I have a modest 26dB antenna on a six feet pole of plastic piping, the piping is strapped to my

Re: [time-nuts] GPS Antenna Feed Line Decision

On 9/3/17 3:41 PM, Charles Steinmetz wrote: Attila wrote: The supplies for LNAs are usually quite benign given two constraints: * * * 1) Low frequency (0Hz to bandwidth of signal) noise is low * * * But 1) is a bit harder as it also includes 1/f noise, temperature, (upstream)

Re: [time-nuts] GPS Antenna Feed Line Decision

I work with a broadcast station. We just had a HD FM radio transmitter upgrade done. In the upgrade package from GatesAir was a GPS antenna with a F fitting. The provided feedline was RG-223 with a TNC on one end and a SMA on the other. Also provided was a TNC to F adapter. The new exciter has

Re: [time-nuts] GPS Antenna Feed Line Decision

te <omni...@gmail.com> Sent: Saturday, September 2, 2017 9:33:09 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] GPS Antenna Feed Line Decision True, though a friend of mine used LMR-400. On Saturday, September 2, 2017, Mark Sims <hol...@hotmail.com>

Re: [time-nuts] GPS Antenna Feed Line Decision

Attila wrote: The supplies for LNAs are usually quite benign given two constraints: * * * 1) Low frequency (0Hz to bandwidth of signal) noise is low * * * But 1) is a bit harder as it also includes 1/f noise, temperature, (upstream) supply and load effects. The LT3042 is better

Re: [time-nuts] GPS Antenna Feed Line Decision

On 09/03/2017 06:02 PM, Bill Byrom wrote: For precision timing measurements, I would think that there would be concern about the double reflections of a badly mismatched low loss transmission line (such as using 75 ohm line in a 50 ohm environment). The re-reflected signal will act similar to

Re: [time-nuts] GPS Antenna Feed Line Decision

For precision timing measurements, I would think that there would be concern about the double reflections of a badly mismatched low loss transmission line (such as using 75 ohm line in a 50 ohm environment). The re-reflected signal will act similar to multipath (as a delayed aggressor) on all

Re: [time-nuts] GPS Antenna Feed Line Decision

On Sun, 3 Sep 2017 12:32:31 -0500 Clay Autery wrote: > - I saw in some aviation references where pilots claimed that they > achieved "better performance" by running their antennas at higher > voltages.  (Overclocking the antenna amp?  Who knows.)  But it piqued my > interest,

Re: [time-nuts] GPS Antenna Feed Line Decision

Hi. The last time I looked at upgrading my GPS antenna feed line (I'm currently using RG58 style cable) I spent some time looking at the temperature vs propagation delay characteristics of various cables. I also picked up a spool of cloned "LMR400 style" cable but ended up using that for my

Re: [time-nuts] GPS Antenna Feed Line Decision

Thank you for your response.  Again, money is not the issue or priority.  Knowing that I am getting the best signal within reason (my reason  ) Tangentially, you have provided me with the information I require.  As I do not know what I will hang off the end of that antenna in the future and I am

Re: [time-nuts] GPS Antenna Feed Line Decision

Actually haven't settled on an exact solution yet, Gilles.  The power supply will likely become part of the observations/experiment that prompted me to use the external supply in the first place. - All of the devices WANT to supply the antenna.  2 are nominal 5VDC, 1 supplies nominal 3.3VDC... 

Re: [time-nuts] GPS Antenna Feed Line Decision

Hi The bigger issue with unsuspended cables is wind and weather. It’s not just a static weight issue. When the wind blows the cable jerks around. You very much want to tie it off against the mast. You also want a strain relief loop at the antenna. Bob > On Sep 3, 2017, at 10:44 AM, Artek

Re: [time-nuts] GPS Antenna Feed Line Decision

Clay LMR-400 is probably the best compromise , I doubt you will see any useful improvement in system performance as a result of the improved 1.5db loss characteristics of the larger cables. Losses due to atmospherics, ionospherics and multi-path will be an orders of magnitude  higher than the

Re: [time-nuts] GPS Antenna Feed Line Decision

Hi There is no need to feed the 58516 or the antenna with any sort of super power supply. It’s just a simple RF amplifier in there. It’s designed to be feed off of the bias supply coming out of a GPS module. If a module has a dedicated 78L05 style regulator on it, it’s one of the better ones ….

Re: [time-nuts] GPS Antenna Feed Line Decision

On 9/2/2017 4:48 PM, Clay Autery wrote: Thanks for the response... Not sure why you and the other guy both recommended RG-6 75-Ohm cable and F-connectors, when the nominal impedance of literally everything else in the system is 50 Ohm, including the antenna and the HP GPS Distribution Amp 

Re: [time-nuts] GPS Antenna Feed Line Decision

On Sat, 2 Sep 2017 18:48:52 -0500 Clay Autery wrote: > Not sure why you and the other guy both recommended RG-6 75-Ohm cable > and F-connectors, when the nominal impedance of literally everything > else in the system is 50 Ohm, including the antenna and the HP GPS >

Re: [time-nuts] GPS Antenna Feed Line Decision

Hi Clay, Intersting subject. What design for ultra stable/clean power supply are you using please ? Thx, Gilles. > On Sep 2, 2017, at 22:47, Clay Autery wrote: > > PCTEL GPS-TMG-HR-26NCM Antenna. >

Re: [time-nuts] GPS Antenna Feed Line Decision

Thanks for the response... Not sure why you and the other guy both recommended RG-6 75-Ohm cable and F-connectors, when the nominal impedance of literally everything else in the system is 50 Ohm, including the antenna and the HP GPS Distribution Amp  And then adding N to F adapters? Doesn't

Re: [time-nuts] GPS Antenna Feed Line Decision

HP 58516A GPS L1 Disribution Amplifier ( 4-way with external power supply input) __ Clay Autery, KY5G On 9/2/2017 3:38 PM, Pete Lancashire wrote: > What are you using for a distribution amplifier ? > > On Sat, Sep 2, 2017 at 11:57 AM, Clay Autery wrote: >

Re: [time-nuts] GPS Antenna Feed Line Decision

PCTEL GPS-TMG-HR-26NCM Antenna.  http://www.neobits.com/pctel_maxrad_gps_tmg_hr_26ncm_high_rejection_gps_p2769137.htm Can't say what the gain tolerances are, but it appears to be a pretty decent quality part. The distribution amp is an HP 58516A GPS L1 Distribution Amp with the external power

Re: [time-nuts] GPS Antenna Feed Line Decision

-Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Clay Autery Sent: Saturday, September 02, 2017 1:57 PM To: Time Nuts Subject: [time-nuts] GPS Antenna Feed Line Decision Having decision-making problems for the materials for my GPS main feedline.  Going to use a TM

Re: [time-nuts] GPS Antenna Feed Line Decision

True, though a friend of mine used LMR-400. On Saturday, September 2, 2017, Mark Sims wrote: > Cheap RG-59 cable coax is more than sufficient for 50 .. 150+ feet (unless > you are doing geodetic level GPS work). It is recommended by several GPSDO > makers. The 50/75 ohm

[time-nuts] GPS Antenna Feed Line Decision

Cheap RG-59 cable coax is more than sufficient for 50 .. 150+ feet (unless you are doing geodetic level GPS work). It is recommended by several GPSDO makers. The 50/75 ohm mismatch is not an issue. No need to waste money on fancy pants artisanal luxury coax.

Re: [time-nuts] GPS Antenna Feed Line Decision

Hi Modern distribution amp chips are likely to be sub 2 db NF. Gain is generally just a bit more than the loss through any post filtering and the passive power splitter after it. Bob > On Sep 2, 2017, at 7:02 PM, Wes wrote: > > This is just a cascaded noise figure

Re: [time-nuts] GPS Antenna Feed Line Decision

On 09/02/2017 02:57 PM, Clay Autery wrote: Having decision-making problems for the materials for my GPS main feedline. Going to use a TM LMR stock, just can't decide how big to go with it... 26 dB 5vdc antenna on top of a 38 foot mast. Feed will come down the inside/center of mast and exit

Re: [time-nuts] GPS Antenna Feed Line Decision

This is just a cascaded noise figure situation. The first stage is the antenna (preamp) which has 26 dB gain (assumed) and an unknown noise figure. Assume it's a dB or so. Let the second stage gain be a negative value equal to the cable loss and the second stage noise figure be equal to the

Re: [time-nuts] GPS Antenna Feed Line Decision

What are you using for a distribution amplifier ? On Sat, Sep 2, 2017 at 11:57 AM, Clay Autery wrote: > Having decision-making problems for the materials for my GPS main > feedline. Going to use a TM LMR stock, just can't decide how big to go > with it... > > 26 dB 5vdc

Re: [time-nuts] GPS Antenna Feed Line Decision

Hi A lot depends on what comes after the feed cable. The “disto amp” will determine a lot. You likely need 10 db of net gain in front of it to keep things running ok. For an antenna that is *really* 26 db (as opposed to 26 db +/- 6 db), that would come out to 16 db of feed line loss. This

[time-nuts] GPS Antenna Feed Line Decision

Having decision-making problems for the materials for my GPS main feedline.  Going to use a TM LMR stock, just can't decide how big to go with it... 26 dB 5vdc antenna on top of a 38 foot mast.  Feed will come down the inside/center of mast and exit near the bottom, thence routed through a window

Re: [time-nuts] GPS Antenna on Tower.

Mark, Excuse my ignorance but where do I find this version? Wes On 6/20/2017 9:34 AM, Mark Sims wrote: I just added the ability to calculate solid earth tides and the vertical gravity offset due to the sun and moon to Lady Heather. The lat/lon offset is typically around +/- 60 cm per day.

Re: [time-nuts] GPS Antenna on Tower.

On Tue, 20 Jun 2017 16:34:14 + Mark Sims wrote: > I just added the ability to calculate solid earth tides and the vertical > gravity offset due to the sun and moon to Lady Heather. Cool! How do you calculate the displacement on a fixed position receiver? > The

Re: [time-nuts] GPS Antenna on Tower.

How do the GPS control/monitoring stations handle Earth tides? My guess is they have another nearby antenna that they can link up to VLBI data. -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To

Re: [time-nuts] GPS Antenna on Tower.

Hi Earth tides are at least as crazy a topic as time. There are formulas that will let you incorporate the effect of Pluto on solid Earth tides. Bob > On Jun 20, 2017, at 7:21 PM, Peter Vince wrote: > > Hi Mark, > > This is all new information to me - and

Re: [time-nuts] GPS Antenna on Tower.

Hi Mark, This is all new information to me - and fascinating! Have you just "calculated" the offsets (using known values from somewhere), or "measured" it by very long term averaging of the GPS position information? Peter Vince On 20 June 2017 at 17:34, Mark Sims

[time-nuts] GPS Antenna on Tower.

I just added the ability to calculate solid earth tides and the vertical gravity offset due to the sun and moon to Lady Heather. The lat/lon offset is typically around +/- 60 cm per day.Vertical offset is around +/- 180mm. Depending upon the day and where you are, the swings are not

Re: [time-nuts] GPS Antenna on Tower.

___ From: time-nuts <time-nuts-boun...@febo.com> on behalf of Thorbjørn Pedersen <thorbjorn.peder...@ikm.no> Sent: June 19, 2017 9:42 PM To: time-nuts@febo.com Subject: Re: [time-nuts] GPS Antenna on Tower. http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx [http://www.

Re: [time-nuts] GPS Antenna on Tower.

I thought there was kind of a rule about EXCLUDING sats on or near the horizon... __ Clay Autery, KY5G On 6/20/2017 8:27 AM, "Björn Gabrielsson" wrote: > Hi Thorbjörn, > > To bad this particula antenna has surrounding buildings (and maybe trees) > that mask low elevation

Re: [time-nuts] GPS Antenna on Tower.

Hi Thorbjörn, To bad this particula antenna has surrounding buildings (and maybe trees) that mask low elevation satellites. -- Björn > http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx > Have a look at the best receiving antenna I know about. > > The tower must have cooling tubes

Re: [time-nuts] GPS Antenna on Tower.

Try again ..., Since 1cm of motion is equivalent to 30 ps, there's probably not much point in putting your GNSS antenna on a geodetic monument if all you care about is timing. But it does matter if you're trying to track continental drift. Michael On Tue, 20 Jun 2017 at 10:44 pm, Michael

Re: [time-nuts] GPS Antenna on Tower.

Since 1cm of motion is equivalent to 30ps, there's probably not On Tue, 20 Jun 2017 at 10:11 pm, Didier Juges wrote: > If that is not time-nutty, I do not know what will :) > > On Jun 20, 2017 7:04 AM, "jimlux" wrote: > > > > > for geodetic

Re: [time-nuts] GPS Antenna on Tower.

It was bright sunshine and 46 degrees C here in the desert near Tucson, Arizona yesterday. It would take a lot of cooling to keep that solar collector (radome) cool. Wes Stewart On 6/19/2017 9:42 PM, Thorbjørn Pedersen wrote: http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx Have

Re: [time-nuts] GPS Antenna on Tower.

LOL!!! My first reaction to reading the drill for sub-subterranean GPS mast was... Wonder if I could borrow Shappell's little drilling rig to do THAT hole and the vertical wells for the geo-thermal cooling loops? Followed closely by... Wonder what kind and number of Sorbothan, et al. dampers

Re: [time-nuts] GPS Antenna on Tower.

On 6/20/17 5:11 AM, Didier Juges wrote: If that is not time-nutty, I do not know what will :) if you're a "real time-nut" you drill your own holes - you buy a surplus drilling rig, refurbish it, figure out how to work it (maybe there's a "drill-nuts" list?), etc. But at least the station

Re: [time-nuts] GPS Antenna on Tower.

If that is not time-nutty, I do not know what will :) On Jun 20, 2017 7:04 AM, "jimlux" wrote: > > for geodetic measurements, they drill a hole down to bedrock, and run a > pipe down to anchor the antenna to the bedrock. > > "All holes shall be drilled straight enough so

Re: [time-nuts] GPS Antenna on Tower.

for geodetic measurements, they drill a hole down to bedrock, and run a pipe down to anchor the antenna to the bedrock. "All holes shall be drilled straight enough so that PVC casing can be installed in the top 15.5 ft of each hole, and that the steel pipe can be freely lowered, not forced,

Re: [time-nuts] GPS Antenna on Tower.

http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx Have a look at the best receiving antenna I know about. The tower must have cooling tubes coiled around it because of the sun heating one side will make it bend away from the sun, and turn this way all day. The cable and doom is also

Re: [time-nuts] GPS Antenna on Tower.

On Mon, 19 Jun 2017 08:52:37 -0400 Dan Kemppainen wrote: > So, what sorts of things are done for high precision survey work? I > would guess a sturdy mount, good sky view, no reflections, good antenna, > no nearby radiators, etc. Those all seem like common sense stuff.

Re: [time-nuts] GPS Antenna on Tower.

Hi If you go totally insane, you build a 30’ tall concrete monolith in the middle of a wide open field. The antenna and ground plane go on top of the monolith. You then grab your chain saw and start knocking down any trees, towers, or homes that happen to obstruct your perfect view. :) Indeed

Re: [time-nuts] GPS Antenna on Tower.

Hi Bob, So, what sorts of things are done for high precision survey work? I would guess a sturdy mount, good sky view, no reflections, good antenna, no nearby radiators, etc. Those all seem like common sense stuff. But for applications that really matter, what sorts of things might be

Re: [time-nuts] GPS Antenna on Tower.

Good comments by Bob. I run 100 ft of Rohn 45 and then have a stack of rotatable antennas at that point. I have the antenna some 3-4 ft off the tower at 90' feeding with 1/2" line.(Because I had it) The trees have grown to 90' so that gives a nice clean view south. Works totally fine. Reason to

Re: [time-nuts] GPS Antenna on Tower.

Hi Will there be an effect? Yes. Are roughly 99% of all GPSDO’s run with antennas mounted that way by “pros” ? Yes again. If you are setting up a reference site for high precision survey work, don’t do it that way. For a GPSDO, you should be fine. Bob > On Jun 16, 2017, at 1:17 PM, Dan

[time-nuts] GPS Antenna on Tower.

Hi All, Fair Warning: Nuts Mode Engaged. :) Recently we've moved to a new house and am in the process of getting the antennas back up for various things. One of these is the GPSDO(s), and an obvious location is somewhere on a Roan 25 tower set up just south of the house. At about half way

Re: [time-nuts] GPS? Antenna

Thanks for all of the help. I contacted Huber Suhner and now have the data sheet and radiation patterns for this antenna. 73 Glenn WB4UIV On 9/6/2016 4:25 AM, Szeker K. wrote: Yes its H-S model, and it must be a GPS antenna...

Re: [time-nuts] GPS? Antenna

Yes its H-S model, and it must be a GPS antenna... http://www.cafr.ebay.ca/itm/Ericsson-KRE-1012082-1-GPS-Antenna-26dBi-For-HUBER-SUHNER-84097323-/182012930579?hash=item2a60d0ea13:g:MAMAAOSwZd1Vdn6- Regards Karl 2016-09-06 5:12 GMT+02:00 Chris Waldrup : > It's a Huber Suhner. >

Re: [time-nuts] GPS Antenna?

Glenn - These outdoor GPS antennas are PLENTIFUL via surplus. Launch3, which offered NOS Symmetricom surplus antennas to this group 12 months ago, are now selling these surplus Ericsson KRE units (eBay). The H inside a hexagon is the corporate logo for Huber-Suhner. Huber is a Swiss HQ

Re: [time-nuts] GPS? Antenna

It's a Huber Suhner. Chris > On Sep 5, 2016, at 21:26, Glenn Little WB4UIV > wrote: > > Pete, > > I do not know if I can send a picture to the mailing list. > > I am sending this to you and the list. > > The antenna is 4 inches from tip of cone to bottom of

Re: [time-nuts] GPS? Antenna

Nemko is the Norwegian "UL", my guess is the numbers are the test/certification numbers. A picture would help -pete On Mon, Sep 5, 2016 at 5:14 PM, Glenn Little WB4UIV < glennmaill...@bellsouth.net> wrote: > At the last hamfest that I attended, I bought an antenna that looks like a > GPS

[time-nuts] GPS? Antenna

At the last hamfest that I attended, I bought an antenna that looks like a GPS antenna. The price was right. This is a Nemko Article number: 84097323, Type number 1315.17.0018. It has a manufacturing date of 09/2012. Can anyone tell me if this is in fact a GPS antenna and what voltage wold be

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

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