[time-nuts] 10811D's on eBay

[Jack Hudler]

I looked at the NetBurner stuff, very nice. They have all the protocols
including NTP/SNTP.
http://www.netburner.com/products/development_kits/network_development.html#kit_
price

Also I took my NTS-100 apart for some nud3 pictures and noticed that has plenty
of room and power for an OCXO and discipline. 

I also found the jumper to change the 1PPS to 10 MHz (Pretty it is NOT!!) but my
5334A took it as an external OSC just fine.

Don't get me wrong the NTS-100 Osc Phase typically floats around 1e-8 but this
is time-nuts! Got to do better than that!

Looks like a path to better performance even though it's short term.

Comments on this? Anyone have a low noise 10MHz distribution circuit?

Jack


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf
Of John Ackermann N8UR
Sent: Wednesday, December 06, 2006 7:12 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 10811D's on eBay

I was about to mention, but you beat me to it...

I've just finished modifying a stack of Soekris net4501s using
Poul-Henning's hardware mods and his nanoBSD configuration that runs
from flash card.  Details on the hardware mods are at
http://www.febo.com/time-freq/ntp/soekris/index.html.  I still need to
do some work on the page, but it seems to accurately describe how to
enable the high-resolution timer.

I've also used my Clock-Block clock synthesizer
(http://www.tapr.org/kits_clock-block.html) to replace the onboard
oscillator in the net4501.  Mine are all clocked from one of the 5061A
cesiums, and get their PPS signals from various time sources in the lab.

The data is still very new because some of the servers have only been
running for a short time, but I have ntp performance plots of these
boxes at http://www.febo.com/time-freq/ntp/stats/index.html.

John
----

Jason Rabel said the following on 12/06/2006 07:02 PM:
> For a web/ntp server, you might want to look at the Soekris Net4501. There
> are some 4501 specific flags you can use in FreeBSD and some neat things
> that PHK has done to make it a very accurate NTP device.
>  
> 
>> Another GPSDO for me OR....
>> It's easy to add a Web Server (PINK) to a Parallax Javelin (or Basic)
> stamp
>> module. 
>>
>> So I think I'll start an NTP server project... why? Cause my NTS100 will
> end of
>> life itself by 2010 due to a firmware issue (If I recall, please correct
> me if
>> I'm wrong or you've managed to burn a bunch of EEPROMS with the new
> firmware).
>> Think it would be a very neat little project!
> 
> 
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> 
> 


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