On 2015-02-24 03:48, Matt wrote:
Thanks for all the advice received on and off list.
My main doubt was about the quality of cheap receivers but you cleared
that doubt. To answer a few questions, the antenna would be put on top
of the building on top right corner of
The tower could create multipath reflections, and electrical equipment
on a roof, such as elevator motors, could add noise.
On top of the tower or further away south west would reduce reflections.
This might be a very small problem if the goal were nanosecond level
timing. But the goal here
On 2/20/2015 4:25 PM, Jim Lux wrote:
/For an inexpensive NTP for few hundred dollars to get better than a
millisecond end of things, I think the integrated GPS antenna/receiver
with a suitable computer right next to it is the way to go. Then you're
just running a network cable and power.
/
Looks like you need the other half of this unit. It looks like it is
designed to use fiber optic cable. You would need to other box to accept
the fiber cables, decode the data and interface it to a normal computer
port.
A good, brand new timing receiver is less then $100. So I'd not want to
Symmetricon swallowed Navstar Systems Ltd. In 1993. So if there were any
information available, they would likely have it, but I fear it may be long
gone.
I did find this reference in the time-nuts archive:
http://www.navsync.com/docs/mushroom_data_sheet.pdf
Which looks like the same animal
Hi,
My university would like to have a 1ms precise source of time to do
some networking experiments (measure one way propagation delays
etc...). So I wandered on the internet to find the best choice with a
budget of ~1000€ (~1100 American dollars).
I've been overwhelmed by the number of
jim...@earthlink.net said:
So really, it's a matter of finding a place to put your Garmin receiver and
string a cable that's not too long to your *nix box running ntp.
The place to put your Garmin receiver may not be as simple as it sounds.
It needs a good view of the sky. Roof is best, but
On Thu, 19 Feb 2015 18:11:08 +0100
Matt matta...@gmail.com wrote:
My university would like to have a 1ms precise source of time to do
some networking experiments (measure one way propagation delays
etc...). So I wandered on the internet to find the best choice with a
budget of ~1000€ (~1100
I think the easiest cable to make really long, if one must be long is the
antenna cable. Use 100 meters of the kind of cable they use for cable
TV. It comes double shield and has those compression type F connectors.
The cable can cary both the GPS signal and power for the amplifier that is
- Original Message -
From: Jim Lux jim...@earthlink.net
To: time-nuts@febo.com
Sent: Friday, February 20, 2015 10:25 AM
Subject: Re: [time-nuts] Looking for advice to get a submillisecond setup
On 2/20/15 6:30 AM, Chris Albertson wrote:
I think the easiest cable to make really
On 2/20/15 6:30 AM, Chris Albertson wrote:
I think the easiest cable to make really long, if one must be long is the
antenna cable. Use 100 meters of the kind of cable they use for cable
TV. It comes double shield and has those compression type F connectors.
The cable can cary both the GPS
I think you're getting into receivers that are well into the hundreds of
dollars range, if bought new.
For an inexpensive NTP for few hundred dollars to get better than a
millisecond end of things, I think the integrated GPS antenna/receiver
with a suitable computer right next to it is the
Not sure how small your University is, Matt. But most telco/networking
departments will have an NTP infrastructure already, that may include local
GPS clocks. If you look around at the ntp servers on the university LAN and
find one or more stratum-1's with millisecond or less delay, you probably
I am unsure which country you are in but the UK supplier
http://www.galleon.eu.com/computer-time-clock.html has a range of
reasonably priced units that may fit your requirements.
Regards
Peter Torry
On 20/02/2015 16:40, Chris Albertson wrote:
I think you're getting into receivers that
On Fri, Feb 20, 2015 at 1:10 PM, Tom Miller tmiller11...@verizon.net
wrote:
- Original Message - From: Jim Lux jim...@earthlink.net
To: time-nuts@febo.com
Sent: Friday, February 20, 2015 10:25 AM
Subject: Re: [time-nuts] Looking for advice to get a submillisecond setup
On 2/20/15
Standalone receivers don't have to be expensive. Take a look at the GPS
receiver modules at sparkfun.com. They are under $100 (some way under),
and some either require or can take an external antenna, and they
provide 1 PPS output. Garmin themselves sells receiver boards without
integrated
Hi,
My university would like to have a 1ms precise source of time to do
some networking experiments (measure one way propagation delays
etc...). So I wandered on the internet to find the best choice with a
budget of ~1000€ (~1100 American dollars).
I've been overwhelmed by the number of
I'll second that. sub-millisend timing using NTP is very easy and not
expensive. An old Motorola timing GPS receiver can be bought for about $20
and then all you need in some kind of computer. NTP can run on any
existing computer while it does it's normal functions.
Getting below a microsecond
On 2/19/15 9:11 AM, Matt wrote:
Hi,
My university would like to have a 1ms precise source of time to do
some networking experiments (measure one way propagation delays
etc...). So I wandered on the internet to find the best choice with a
budget of ~1000€ (~1100 American dollars).
I've been
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