Discussion:
Need recommendation for GPS antenna for Oncore GPS module
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Toby Riddell
2018-11-03 21:26:51 UTC
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Hi all,

I want to fit a GPS antenna on our house (the attic is being renovated and
it just occurred to me that if I move fast I can get it done before the
walls are closed up again!)

I was planning on having it mounted on a south-facing wall but below the
roofline - does this sound okay for picking up satellites? It can poke
above the roofline if needed as long as the mounts are on the wall (not the
top of the roof).

Is there a recommended antenna? I am planning on feeding it into an Oncore
GPS module which will then interface to a Soekris net4501 running nanoBSD
and ntpns.

Thanks!

Toby
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Scott McGrath
2018-11-04 12:25:07 UTC
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For timing use ideally it should be above the roofline by at least several feet otherwise satellites close to the horizon will be not be visible.

The generally preferred antenna is the Agilent/Keysight/Symmetricom. 58504A antenna also any outdoor antenna made by Trimble or TrueTime as long as antenna does not use a downconverter.



On Nov 3, 2018, at 5:26 PM, Toby Riddell <***@prevtec.com> wrote:

Hi all,

I want to fit a GPS antenna on our house (the attic is being renovated and
it just occurred to me that if I move fast I can get it done before the
walls are closed up again!)

I was planning on having it mounted on a south-facing wall but below the
roofline - does this sound okay for picking up satellites? It can poke
above the roofline if needed as long as the mounts are on the wall (not the
top of the roof).

Is there a recommended antenna? I am planning on feeding it into an Oncore
GPS module which will then interface to a Soekris net4501 running nanoBSD
and ntpns.

Thanks!

Toby
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Toby Riddell
2018-11-04 16:43:57 UTC
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Thanks Scott - I will look into getting one of those. And noted re. the
roofline!
Post by Scott McGrath
For timing use ideally it should be above the roofline by at least several
feet otherwise satellites close to the horizon will be not be visible.
The generally preferred antenna is the Agilent/Keysight/Symmetricom.
58504A antenna also any outdoor antenna made by Trimble or TrueTime as long
as antenna does not use a downconverter.
Hi all,
I want to fit a GPS antenna on our house (the attic is being renovated and
it just occurred to me that if I move fast I can get it done before the
walls are closed up again!)
I was planning on having it mounted on a south-facing wall but below the
roofline - does this sound okay for picking up satellites? It can poke
above the roofline if needed as long as the mounts are on the wall (not the
top of the roof).
Is there a recommended antenna? I am planning on feeding it into an Oncore
GPS module which will then interface to a Soekris net4501 running nanoBSD
and ntpns.
Thanks!
Toby
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Matthew D'Asaro
2018-11-04 17:39:54 UTC
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For what it is worth, I got a used HP/Symmetricom 58532a antenna off of eBay for about $50. It needed a minor repair (broken internal coax) but once that was done it has worked great for me. The other one I considered was the 58504a but they were more expensive on the used market and didn't seem as weather proof (a special weather proof cap was offered as an add-on but most don't have it) so I went with the newer 58532a.

-Matthew D'Asaro
Post by Toby Riddell
Thanks Scott - I will look into getting one of those. And noted re. the
roofline!
Post by Scott McGrath
For timing use ideally it should be above the roofline by at least several
feet otherwise satellites close to the horizon will be not be visible.
The generally preferred antenna is the Agilent/Keysight/Symmetricom.
58504A antenna also any outdoor antenna made by Trimble or TrueTime as long
as antenna does not use a downconverter.
Hi all,
I want to fit a GPS antenna on our house (the attic is being renovated and
it just occurred to me that if I move fast I can get it done before the
walls are closed up again!)
I was planning on having it mounted on a south-facing wall but below the
roofline - does this sound okay for picking up satellites? It can poke
above the roofline if needed as long as the mounts are on the wall (not the
top of the roof).
Is there a recommended antenna? I am planning on feeding it into an Oncore
GPS module which will then interface to a Soekris net4501 running nanoBSD
and ntpns.
Thanks!
Toby
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Toby Riddell
2018-11-04 17:57:00 UTC
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I spotted this on Ebay, the price is very attractive and I saw this model
mentioned previously in the mailing list archives:

https://www.ebay.ca/itm/Ericsson-KRE-1012082-1-GPS-Antenna-26dBi-For-HUBER-SUHNER-Bracket-84097323/272646019498?hash=item3f7af819aa:g:US8AAOSwRUhZAIhz:rk:3:pf:0&vxp=mtr

Anyone have a manual or datasheet for it? I cannot seem to find one using
Google.
Post by Matthew D'Asaro
For what it is worth, I got a used HP/Symmetricom 58532a antenna off of
eBay for about $50. It needed a minor repair (broken internal coax) but
once that was done it has worked great for me. The other one I considered
was the 58504a but they were more expensive on the used market and didn't
seem as weather proof (a special weather proof cap was offered as an add-on
but most don't have it) so I went with the newer 58532a.
-Matthew D'Asaro
Post by Toby Riddell
Thanks Scott - I will look into getting one of those. And noted re. the
roofline!
Post by Scott McGrath
For timing use ideally it should be above the roofline by at least
several
Post by Toby Riddell
Post by Scott McGrath
feet otherwise satellites close to the horizon will be not be visible.
The generally preferred antenna is the Agilent/Keysight/Symmetricom.
58504A antenna also any outdoor antenna made by Trimble or TrueTime as
long
Post by Toby Riddell
Post by Scott McGrath
as antenna does not use a downconverter.
Hi all,
I want to fit a GPS antenna on our house (the attic is being renovated
and
Post by Toby Riddell
Post by Scott McGrath
it just occurred to me that if I move fast I can get it done before the
walls are closed up again!)
I was planning on having it mounted on a south-facing wall but below the
roofline - does this sound okay for picking up satellites? It can poke
above the roofline if needed as long as the mounts are on the wall (not
the
Post by Toby Riddell
Post by Scott McGrath
top of the roof).
Is there a recommended antenna? I am planning on feeding it into an
Oncore
Post by Toby Riddell
Post by Scott McGrath
GPS module which will then interface to a Soekris net4501 running
nanoBSD
Post by Toby Riddell
Post by Scott McGrath
and ntpns.
Thanks!
Toby
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Post by Toby Riddell
and follow the instructions there.
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Bob kb8tq
2018-11-04 21:49:30 UTC
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Hi

Appears to be an Italian clone of the generic timing antenna. That is only a guess and it could
easily be something very different …. Since it’s a part made for Erickson by somebody else,
you would need their part number to properly track it down. If it’s a custom part, even that might
be impossible.

Bob
Post by Toby Riddell
I spotted this on Ebay, the price is very attractive and I saw this model
https://www.ebay.ca/itm/Ericsson-KRE-1012082-1-GPS-Antenna-26dBi-For-HUBER-SUHNER-Bracket-84097323/272646019498?hash=item3f7af819aa:g:US8AAOSwRUhZAIhz:rk:3:pf:0&vxp=mtr
Anyone have a manual or datasheet for it? I cannot seem to find one using
Google.
Post by Matthew D'Asaro
For what it is worth, I got a used HP/Symmetricom 58532a antenna off of
eBay for about $50. It needed a minor repair (broken internal coax) but
once that was done it has worked great for me. The other one I considered
was the 58504a but they were more expensive on the used market and didn't
seem as weather proof (a special weather proof cap was offered as an add-on
but most don't have it) so I went with the newer 58532a.
-Matthew D'Asaro
Post by Toby Riddell
Thanks Scott - I will look into getting one of those. And noted re. the
roofline!
Post by Scott McGrath
For timing use ideally it should be above the roofline by at least
several
Post by Toby Riddell
Post by Scott McGrath
feet otherwise satellites close to the horizon will be not be visible.
The generally preferred antenna is the Agilent/Keysight/Symmetricom.
58504A antenna also any outdoor antenna made by Trimble or TrueTime as
long
Post by Toby Riddell
Post by Scott McGrath
as antenna does not use a downconverter.
Hi all,
I want to fit a GPS antenna on our house (the attic is being renovated
and
Post by Toby Riddell
Post by Scott McGrath
it just occurred to me that if I move fast I can get it done before the
walls are closed up again!)
I was planning on having it mounted on a south-facing wall but below the
roofline - does this sound okay for picking up satellites? It can poke
above the roofline if needed as long as the mounts are on the wall (not
the
Post by Toby Riddell
Post by Scott McGrath
top of the roof).
Is there a recommended antenna? I am planning on feeding it into an
Oncore
Post by Toby Riddell
Post by Scott McGrath
GPS module which will then interface to a Soekris net4501 running
nanoBSD
Post by Toby Riddell
Post by Scott McGrath
and ntpns.
Thanks!
Toby
_______________________________________________
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Post by Toby Riddell
and follow the instructions there.
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Attila Kinali
2018-11-04 17:57:35 UTC
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On Sat, 3 Nov 2018 17:26:51 -0400
Post by Toby Riddell
I was planning on having it mounted on a south-facing wall but below the
roofline - does this sound okay for picking up satellites? It can poke
above the roofline if needed as long as the mounts are on the wall (not the
top of the roof).
Unless you have a European style roof, with lots of metal around, there
will be no benefit of placing the antenna below the roofline, as it will
be electrically the highest grounded object. Hence you will need some
lightning arrestors (go for satellite receiver equipment) anyways. This also
means that you can go above the roofline, to avoid multipath, which
is the single biggest contributor to timing jitter in GPSDOs with
non-ideal antenna positions. Recommended are 2-3m above any surrounding
obstacle, but I guess anything from 1m upwards is ok.
Post by Toby Riddell
Is there a recommended antenna? I am planning on feeding it into an Oncore
GPS module which will then interface to a Soekris net4501 running nanoBSD
and ntpns.
And brand antenna is good enough unless you want to go for below 10ns accuracy.
Brand names include Symmetricom/Microsemi, Trimble, Novatel, Leica, ....

Attila Kinali
--
<JaberWorky> The bad part of Zurich is where the degenerates
throw DARK chocolate at you.

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Gregory Beat via time-nuts
2018-11-05 17:32:17 UTC
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About 18 months ago, David Zoldan (Launch3.net) had over 250 surplus Symmetricom / Microsemi 58532A GPS Antennas from the cellular/mobile industry.
https://www.microsemi.com/document-portal/doc_view/133381-58532a-datasheet

He offered these to time-nuts group for an attractive price ($25 at time, cheaper than you’ll find on eBay). You can contact him, if any surplus inventory remains.

David Zoldan
www.Launch3.net
P: 646.536.3699 | C: 917.374.7482 | F: 646.536.3866 | E: ***@Launch3.net
27 Daniel Rd. | Fairfield, New Jersey | 07004

==
g. beat, w9gb
chicago

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Azelio Boriani
2018-11-06 09:18:10 UTC
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This antenna is manufactured by Huber&Suhner, you can find the
complete manual here (find it in the pictures of the item):
<https://www.ebay.com/p/Ericsson-Kre-101-2082-1-GPS-Active-Antenna-Nemko-Ship-L308/1633780337>
On Mon, Nov 5, 2018 at 6:33 PM Gregory Beat via time-nuts
Post by Gregory Beat via time-nuts
About 18 months ago, David Zoldan (Launch3.net) had over 250 surplus Symmetricom / Microsemi 58532A GPS Antennas from the cellular/mobile industry.
https://www.microsemi.com/document-portal/doc_view/133381-58532a-datasheet
He offered these to time-nuts group for an attractive price ($25 at time, cheaper than you’ll find on eBay). You can contact him, if any surplus inventory remains.
David Zoldan
www.Launch3.net
27 Daniel Rd. | Fairfield, New Jersey | 07004
==
g. beat, w9gb
chicago
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