I took a closer look at this board. It has a lot to offer over the older
Digilent 2 boards that I've used a fair bit.
If there was interest, we could do some aux interface boards for the
Nexsys-2 -- either simple I or O boards for the 2x6 connectors or a bigger
multi-function I/O board for
From: david brown [EMAIL PROTECTED]
Subject: [time-nuts] Digital TV signals
Date: Wed, 16 Apr 2008 09:25:21 -0700
Message-ID: [EMAIL PROTECTED]
From a complete amateur, is there any useful timing info to be gained
from the newer format of digital tv transmission(Australia) to replace
that
David,
maybe that your TV derived frequency standard IS already obsolete
ALTHOUGH you may still receive analogue transmissions!
In Germany the ZDF was known to have a rubidium standard in their
transmitting central in Mainz that was phase locked to the atomic clock
ensemble at the PTB (the
Thank you for your ideas,
It will be good for me to go thou the process of improvement one step at a
time, I have several steps to try that should keep me busy, I expect to make
several prototypes and with some luck try several methods. I do need to
bootstrap my self up as I have to develop
The ECL part you've selected seems to simplify interfacing with its
synchronous enables.
I think you are missing the decimal point.
A synchronous enable will have setup/hold times. They will (generally) be
less than the cycle time (1 ns). You aren't going to get that level of
timing
The two ways I hoped to get around the counter ripple was to measure every
other set of PPS with the counter stopped in between. Or two counters running
in opposite seconds, one running while the other is stopped.
Due to my error not everyone received all the discussion, my email reply puts
Hi Ulrich,
interesting story. A bit of history from my side:
In about 1996 I lived in Stuttgart and we measured the Hs frequencies of the
German TV stations at the time. I used a Philips SAA7111 or similar Video
decoder's 27,0MHz output (which is line-locked to Hs) to measure the
Hi Bruce,
did you or anyone every build this LTC application?
I wonder about the tempco matching of the reference 1N457 diodes
compensating the 2N5771 etc...
bye,
Said
In a message dated 4/15/2008 21:32:14 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
For one version of a
[EMAIL PROTECTED] wrote:
Hi Bruce,
did you or anyone every build this LTC application?
I wonder about the tempco matching of the reference 1N457 diodes
compensating the 2N5771 etc...
bye,
Said
Said
Not this particular implementation but have built similar circuits
decades
Bruce Griffiths
Correction added:
Said
Not this particular implementation but have built similar circuits
decades ago.
Tempco isnt an issue.
There's plenty of time to interleave calibration cycles of say 100ns,
200ns, 300ns, 400ns duration between PPS measurements.
It should even be
Hi Bruce:
The A/D used is only 12 bits @ 300 kHz and Linear now has very similar 12 bit
A/D at 600 kHz and 24 bit much slower. Since a s/h is used to capture the ramp
value the key spec seems to be that the hold time exceeds the conversion time.
Are there s/h circuits that hold for more
Brooke Clarke wrote:
Hi Bruce:
The A/D used is only 12 bits @ 300 kHz and Linear now has very similar 12 bit
A/D at 600 kHz and 24 bit much slower. Since a s/h is used to capture the
ramp
value the key spec seems to be that the hold time exceeds the conversion
time.
Are there s/h
Hi Bruce,
got it, I also like the pulse stretcher dual-slope interpolator technique
you mention.
bye,
Said
In a message dated 4/16/2008 17:36:44 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
Another widely used technique is the Wilkinson converter wher the
capacitor is charges
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