Re: [time-nuts] Serial port splitter s/w

2014-02-27 Thread Didier Juges
A number of people have reported issues with the Raspberry Pi Ethernet hardware when used for NTP, as it is actually a USB-Ethernet bridge and the drivers may not be all they could be. I have not had problems myself but I do not run NTP on it. The Beaglebone Black (BBB) is supposed to be better

Re: [time-nuts] Serial port splitter s/w

2014-02-27 Thread Chris Albertson
Yes the BBB has about twice or more the performance over the Pi except in graphics. The Pi has a faster GPU. But in the case of an NTP server you likely would never connect a monitor or keyboard to the computer so the GPU will go unused. However the NTP is very un-demanding and will only see on

Re: [time-nuts] Serial port splitter s/w

2014-02-27 Thread David J Taylor
A number of people have reported issues with the Raspberry Pi Ethernet hardware when used for NTP, as it is actually a USB-Ethernet bridge and the drivers may not be all they could be. I have not had problems myself but I do not run NTP on it. The Beaglebone Black (BBB) is supposed to be better

[time-nuts] Serial port splitter s/w

2014-02-26 Thread David C. Partridge
I'm running Meinberg NTP on the Windows 7 x64 machine to which my Thunderbolt is attached. I'd like to be able to share the serial port between LH and NTP so that I can run the machine as an NTP Stratum 1 server locked to the TB, and also be able to use LH to check things. I looked around the

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread David J Taylor
I'm running Meinberg NTP on the Windows 7 x64 machine to which my Thunderbolt is attached. I'd like to be able to share the serial port between LH and NTP so that I can run the machine as an NTP Stratum 1 server locked to the TB, and also be able to use LH to check things. I looked around

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread Chris Albertson
It's not going to work. If the purpose of running the Thunderbolt is only to drive NTP then you don't need LH. NTP's only tags the pulses to the nearest microsecond, nano sec on accuracy is lost on NTP. I'd even say the TB is the wrong GPS for NTP. It costs to much and uses to much power.

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread d0ct0r
Here is interesting topic about NTP on Raspberry PI (typical usage of ARM and Linux bread on top of it) http://www.synclab.org/?tag=testing Basically, TCP stack on ARM usually come from one source - its a Adam Dunken TCP stack. Then its is MII part and the hardware which doing Ethernet.

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread corcsal
I have some problems with My 8505A Analyzer, it has no RF output, I checked the YTO and other frequency dividers and it appears to be OK some times there is RF output only it will not tune and it seems to cut out as I tune trough the frequency range. Thank You Sal C. Cornacchia Electronic RF

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread paul swed
Ummm think you sent the question to the wrong group perhaps? On Wed, Feb 26, 2014 at 12:50 PM, corc...@yahoo.ca wrote: I have some problems with My 8505A Analyzer, it has no RF output, I checked the YTO and other frequency dividers and it appears to be OK some times there is RF output only

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread Brent Gordon
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Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread Hal Murray
david.partri...@perdrix.co.uk said: I looked around the with Google, and saw *numerous serial port splitters. Which is recommended? If your lines are short, you don't need fancy hardware. The RS-232 driver will drive 2 lines. Just take 2 cables, cut them in half, connect the wires...

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread Paul
On Wed, Feb 26, 2014 at 12:32 PM, Chris Albertson albertson.ch...@gmail.com wrote: You can NOT control a GPS from two ports. Both NTP and LH will try to send commands to the GPS. Actually the Palisades driver doesn't send commands to the Thunderbolt. It sends a single invalid command

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread Chris Albertson
On Wed, Feb 26, 2014 at 9:53 AM, d0ct0r t...@patoka.org wrote: Here is interesting topic about NTP on Raspberry PI (typical usage of ARM and Linux bread on top of it) The article addresses using the Pi as an NTP server with stratum 0. In other words as an NTP server that uses another NTP

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread Brent Gordon
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Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread David J Taylor
From: Chris Albertson [] Except as an exercise there is almost no point any more using GPS to drive a local NTP server if you have a very good Internet connection. My fiber Internet connection is as good as Ethernet as the Pool Servers work well for me. Those using slower or a widely shared

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread Chris Albertson
On Wed, Feb 26, 2014 at 11:15 AM, David J Taylor david-tay...@blueyonder.co.uk wrote: The Raspberry Pi with GPS/PPS certainly beats any internet connection I've ever had delivered to this house, though: Yes it will. But the point of the server is to deliver time to other computers. The the

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread David J Taylor
From: Chris Albertson Sent: Wednesday, February 26, 2014 7:32 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Serial port splitter s/w On Wed, Feb 26, 2014 at 11:15 AM, David J Taylor david-tay...@blueyonder.co.uk wrote: The Raspberry Pi with GPS/PPS

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread Chris Albertson
Chris, even with Wi-Fi connected computers, mostly running Windows, there is a huge difference between talking to a stratum-1 server on my LAN compared to running just Internet servers. Our experiences differ, as I am on a cable modem connection from the UK's Virgin Media. Folks need to

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread Brian Lloyd
On Wed, Feb 26, 2014 at 2:05 PM, Chris Albertson albertson.ch...@gmail.comwrote: Chris, even with Wi-Fi connected computers, mostly running Windows, there is a huge difference between talking to a stratum-1 server on my LAN compared to running just Internet servers. Our experiences differ,

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread David C. Partridge
Subject: Re: [time-nuts] Serial port splitter s/w The Raspberry Pi with GPS/PPS certainly beats any internet connection I've ever had delivered to this house, though: http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html http://www.satsignal.eu/mrtg/performance_ntp.php Cheers, David -- SatSignal

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread David McGaw
Serial outputs can usually drive several serial inputs if the cables are short (to avoid reflections). You can wire it yourself, serial out from the TB to both LH and NTP, serial in from LH only. David On 2/26/14 11:51 AM, David J Taylor wrote: I'm running Meinberg NTP on the Windows 7 x64

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread Chris Albertson
On Wed, Feb 26, 2014 at 1:30 PM, David C. Partridge david.partri...@perdrix.co.uk wrote: You guys have me persuaded - I'll get a Raspberry Pi ... You might want to think a little more about which to get. The Pi is OK and will work fine but look at BeagleBone Black. It's a little nicer for

Re: [time-nuts] Serial port splitter s/w

2014-02-26 Thread David J Taylor
From: Chris Albertson You might want to think a little more about which to get. The Pi is OK and will work fine but look at BeagleBone Black. It's a little nicer for hardware hackers. Cost is $5 different. You can read specs and the respective forums. One thing to watch out for is that all