I have measured the accuracy of the time base of my M-Audio Delta 44
sound card with the tolerance (and the accuracy) of 2.5 ppm
I modified my program TCube for a sampling rate of 96 kHz, and set it
for 40 kHz output.
I connected the output to my 5328B (whose time base is driven by
Alberto di Bene wrote:
P.S. Let me please test how this reflector behaves when sending HTML
messages... I have noticed a strange behavior in the past... it
insists on reformatting
the HTML message at its will...
Here following there should be an image... let's see if it shows up
Alberto di Bene wrote:
Alberto di Bene wrote:
P.S. Let me please test how this reflector behaves when sending HTML
messages... I have noticed a strange behavior in the past... it
insists on reformatting
the HTML message at its will...
Here following there should be an image... let's see
In message [EMAIL PROTECTED], John Ackermann N8UR writes:
The list is set to convert HTML to plain text. That's what Mailman
defaults to on setup, but I pretty strongly agree with that approach, so
left it as is.
Yes please, no HTML if we can avoid it.
--
Poul-Henning Kamp | UNIX
The list is set to convert HTML to plain text. That's what Mailman
defaults to on setup, but I pretty strongly agree with that approach, so
left it as is.
Yes please, no HTML if we can avoid it.
HTML is of course a vehicle of infections and the use of net resources
is not optimal,
Ulrich Bangert wrote:
Because it is a differential measurement between the two channels (which
are sampled exactly the same time due to the adc hardware) the first
idea was, that the effects introduced by the not so good sample clock of
a ordinary sound card may cancel out completely.
Beware
-nuts] Re: Accuracy of a sound card
Ulrich Bangert wrote:
Because it is a differential measurement between the two channels
(which are sampled exactly the same time due to the adc
hardware) the
first idea was, that the effects introduced by the not so
good sample
clock of a ordinary
Hi Alberto,
My point in starting this whole controversy was that there are no adjustments
on the sound cards, and the oscillators are just garden variety in quality.
Typically,
they are simply a miniature crystal that runs an oscillator on an ASIC. The
accuracy your
card gets is
In message [EMAIL PROTECTED], Chuck Harris writes:
No one has yet addressed the actual oscillator that is on board the sound card.
What are they using on the Delta 44? ... the Aureon Sky? I would have much
more confidence if they would at least use a cheap TCXO module.
Using a tcxo for a
Hi Poul,
I am quite aware that making a soundcard more accurate is gilding the
lilly.
But if you return to the middle of this thread, where I offered powerline
noise up as a reasonably accurate, ubiquitious timing reference, and had
my suggestion refuted by a gentleman with a soundcard based
From: Chuck Harris [EMAIL PROTECTED]
Subject: Re: [time-nuts] Re: Accuracy of a sound card
Date: Tue, 23 Aug 2005 15:43:54 -0400
Message-ID: [EMAIL PROTECTED]
Hi Poul,
Hi Chuck,
I am quite aware that making a soundcard more accurate is gilding the
lilly.
But if you return to the middle
Alberto di Bene wrote:
Tom Van Baak wrote:
I measured the phase, frequency and Allan deviation of
the sound card on my cheap PC. You'll enjoy the results:
http://www.leapsecond.com/pages/sound-1pps/
If any of you with a high-end sound card want to repeat
the experiment let me know.
From: David Kirkby [EMAIL PROTECTED]
Subject: Re: [time-nuts] Re: Accuracy of a sound card
Date: Mon, 22 Aug 2005 23:06:49 +0100
Message-ID: [EMAIL PROTECTED]
David,
Unfortunately, while my 5328B has the HPIB interface, my PC doesn't, so
I cannot collect data automatically, otherwise
David Kirkby wrote:
If your PC has an ISA slot, or you have an older PC with an ISA slot,
then a GPIB board is not that expensive on eBay. Just save yourself a
lot of hassle and get one from National Instruments, as they are
better supported than other makes.
I have an ISA GPIB card
: Monday, August 22, 2005 3:46 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Re: Accuracy of a sound card
David Kirkby wrote:
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time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo
From: Alberto di Bene [EMAIL PROTECTED]
Subject: [time-nuts] Re: Accuracy of a sound card
Date: Tue, 23 Aug 2005 00:45:59 +0200
Message-ID: [EMAIL PROTECTED]
David Kirkby wrote:
If your PC has an ISA slot, or you have an older PC with an ISA slot,
then a GPIB board is not that expensive
Alberto di Bene wrote:
David Kirkby wrote:
If your PC has an ISA slot, or you have an older PC with an ISA slot,
then a GPIB board is not that expensive on eBay. Just save yourself a
lot of hassle and get one from National Instruments, as they are
better supported than other makes.
I have
An old PC is probably your best bet.
Before I start hunting for an old PC with an ISA slot, does anybody know
if Capital Equipment Corporation (the maker of my ISA GPIB card) is
still in business ?
I am fearing that finding drivers for this card won't be that easy...
73 Alberto I2PHD
Alberto di Bene wrote:
I am fearing that finding drivers for this card won't be that easy...
I was wrong ! I have just found the drivers here :
http://www.cec488.com/gpibupgd.html
A free download... now the quest for the ISA PC can start... :-)
73 Alberto I2PHD
Alberto di Bene wrote:
An old PC is probably your best bet.
Before I start hunting for an old PC with an ISA slot, does anybody know
if Capital Equipment Corporation (the maker of my ISA GPIB card) is
still in business ?
I am fearing that finding drivers for this card won't be that easy...
I know :-( I checked the NI prices and for such a card they want a
couple hundreds Euros or more...
I am wondering... I know of the existence of USB = RS232 adaptors. May
be someone sells also USB = GPIB converters ? Nobody knows ?
73 Alberto I2PHD
Alberto,
I do almost all my
: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Tom Van Baak
Sent: Monday, August 22, 2005 10:43 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Re: Accuracy of a sound card
I know :-( I checked the NI prices and for such a card they want a
couple
, 2005 7:50 PM
To: Tom Van Baak; Discussion of precise time and frequency measurement
Subject: RE: [time-nuts] Re: Accuracy of a sound card
Agilent also now has a USB to GPIB converter. Of course it's
several hundred
dollars also, and uses the Agilent I/O libraries. Not sure, but
I think
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