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Message: 9
Date: Sun, 24 May 2015 10:33:47 +0300
From: Esa Heikkinen tn1...@nic.fi
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] IRIG-B audio decoder circuits and ICs sought
Message-ID: 55617edb.5070...@nic.fi
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Message: 9
Date: Sun, 24 May 2015 10:33:47 +0300
From: Esa Heikkinen tn1...@nic.fi
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] IRIG-B audio decoder circuits and ICs sought
Joseph Gwinn kirjoitti:
When I last used IRIG-B005, the vendor (Symmetricom?) said it was good
for a few meters only on shielded twisted pair. I recall that the
handling of shield grounds was strange. This was OK, because the
signal was confined to one cabinet, and it worked just fine.
But
: [time-nuts] IRIG-B audio decoder circuits and ICs sought
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CAJ_qRvZ+1Zep_Wx8k+o-qY=h3dxgdnlcpj20tuaw_ncffmi...@mail.gmail.com
Content-Type: text/plain; charset=UTF-8
On Thu, May 21, 2015 at 10:22 PM, Joseph Gwinn joegw...@comcast.net wrote:
The definition of good here
Joseph Gwinn kirjoitti:
I prefer the DC level shifted variant of IRIG-B.
I like and use IRIG-B00x too, but it only reaches a few meters, versus
the required tens of meters.
It's differential RS485-alike bus (with TS2100 at least) using 5V
signalling level. It works easily more than few
It's util/tg2.c
How do I get hold of the code? Is it in the NTP distribution,
versus all by itself somewhere?
It's in the normal distribution. Tar file available from:
http://support.ntp.org/bin/view/Main/SoftwareDownloads
--
These are my opinions. I hate spam.
-nuts] IRIG-B audio decoder circuits and ICs sought
Message-ID: 2015052112517328.ec5eb...@comcast.net
Content-Type: text/plain; charset=us-ascii
Multiple answers interspersed below. Joe
On Wed, 20 May 2015 10:04:19 -0400, time-nuts-requ...@febo.com wrote:
[snip
I remember the need to use assembly also. But those days are gone for
two reasons (1) modern optimizing compilers are so good that they can
beat hand written assembly. and (2) Today CPUs are cheeper than
software engineers. Back in the 70's it was the other way around.
And NO, using C is
joegw...@comcast.net said:
I recall that there are audio files with real IRIG-B12x signals in them,
for testing. Does anyone recall where these files are?
There is a program in the ntp package that generates IRIG audio from the
local system clock. It says IRIG-B, but I don't know about
measurement
time-nuts@febo.com
Subject: Re: [time-nuts] IRIG-B audio decoder circuits and ICs sought
See for example the Truetime 820 decoder. Discriminators, One-shots, and
Flip-Flops with pots to tweak the levels.
Hmm. Interesting. URL?
I'm not sure 0.1us is a reasonable
...@rubidium.se
Subject: Re: [time-nuts] IRIG-B audio decoder circuits and ICs sought
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Joe,
On 05/19/2015 03:51 PM, Joseph Gwinn wrote:
I'm studying up on how IRIG-B decoder circuits work. What are the good
approaches, the bad approaches, especially in the presence
On Wed, 20 May 2015 12:00:01 -0400, time-nuts-requ...@febo.com wrote:
Message: 1
Date: Wed, 20 May 2015 09:19:47 -0500
From: Graham / KE9H ke9h.gra...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] IRIG-B audio decoder
Be aware that there are about 100 variations on IRIG B, that is, B000
through B257.
You should obtain a copy of IRIG STANDARD 200-04, the 2004 version,
which I believe is the most current. It is available on line, if you
Google for it.
--- Graham / KE9H
==
On Tue, May 19, 2015 at 8:11 PM, Neil
A bc635 can be had on eBay for almost nothing. It's not a pleasant piece of
gear, but this is one task it can help you with greatly.
Tools exist to let you analyse the stream extensively, and the Api is
trivial to learn -but not super featured at the high level.
On Tuesday, May 19, 2015, Tim
Joseph Gwinn kirjoitti:
I'm studying up on how IRIG-B decoder circuits work. What are the good
approaches, the bad approaches, especially in the presence of noise?
(I asked on the NTP group, with little result beyond the C/C++ decoder
software written for the audio channel of a 1990s Sun
I'm studying up on how IRIG-B decoder circuits work. What are the good
approaches, the bad approaches, especially in the presence of noise?
(I asked on the NTP group, with little result beyond the C/C++ decoder
software written for the audio channel of a 1990s Sun workstation,
which it ate
Joe,
On 05/19/2015 03:51 PM, Joseph Gwinn wrote:
I'm studying up on how IRIG-B decoder circuits work. What are the good
approaches, the bad approaches, especially in the presence of noise?
(I asked on the NTP group, with little result beyond the C/C++ decoder
software written for the audio
See for example the Truetime 820 decoder. Discriminators, One-shots, and
Flip-Flops with pots to tweak the levels.
Tim N3QE
On Tuesday, May 19, 2015, Joseph Gwinn joegw...@comcast.net wrote:
I'm studying up on how IRIG-B decoder circuits work. What are the good
approaches, the bad
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