: Stanley Reynolds [EMAIL PROTECTED]
To: time-nuts@febo.com
Cc: [EMAIL PROTECTED]
Sent: Wednesday, June 11, 2008 11:12:49 AM
Subject: Auston 2100F
Just got one on Ebay, it was reported with display problems and possibly not
working. The display problem was real but it appears to work fine. Thanks
a Austron 2010B
reference as part of a triple redundant clock (GPS, Loran-C, and Cesium beam).
http://tycho.usno.navy.mil/ptti/1993/Vol%2025_02.pdf
Stanley
- Original Message
From: Dan Rae [EMAIL PROTECTED]
To: Stanley Reynolds [EMAIL PROTECTED]
Sent: Wednesday, June 11, 2008 12:23:35
Just got one on Ebay, it was reported with display problems and possibly not
working. The display problem was real but it appears to work fine. Thanks
Brooke Clarke his quick start for the 2100T works for the 2100F if you
substitute ACQ key for Master key. Fixed 1/2 of the display problem
- Forwarded Message
From: Stanley Reynolds [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Wednesday, June 11, 2008 12:04:26 PM
Subject: Re: [time-nuts] Austron 2100F
- Original Message
From: Dan Rae [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
I'm not Didier Juges but assume he is refering to TAPR:
Phone: 972-671-TAPR (8277)
Office Hours: (US Central Time zone) 0900-1700 Monday - Friday
email web site: https://www.tapr.org/inforequest.php
Stanley
- Original Message
From: Bruce Lanning [EMAIL PROTECTED]
To: Discussion of
My HP5334B tabs look like this with a 1 3/4 inch seperation for the case holes
and the same for the rack mount.
http://i307.photobucket.com/albums/nn306/stanleyreynolds/hp1.jpg
http://i307.photobucket.com/albums/nn306/stanleyreynolds/hp2.jpg
a
My HP5334B tabs look like this with a 1 3/4 inch seperation for the case holes
and the same for the rack mount.
http://i307.photobucket.com/albums/nn306/stanleyreynolds/hp1.jpg
http://i307.photobucket.com/albums/nn306/stanleyreynolds/hp2.jpg
Correction my counter is a HP5334A not B sorry don't know if they are different.
- Original Message
From: Stanley Reynolds [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Thursday, June 5, 2008 12:27:15 PM
Subject: [time-nuts] Fw: HP 5334B rackmount ears
My HP5334B tabs look like
- Original Message
From: Glenn Little WB4UIV [EMAIL PROTECTED]
To: Time-Nuts list time-nuts@febo.com
Sent: Monday, May 26, 2008 10:43:26 PM
Subject: [time-nuts] 468-DC NBS Time receiver
I found one of these in my stuff. Is it good for anything but parts?
As I understand it, the
I have the same project on my list. In a general sense my idea is to log as
much as possible at the same time.
Room temp, power, and any logs from the discipline oscillators. For the first
cut a counter for each oscillator with a common time base using a IEEE-488
interface bus, also known as
Block diagram of using a modified version of the DO controllers to compare
several disciplined oscillators. The single logging PC could be several PCs as
a way to have enough serial ports.
http://i307.photobucket.com/albums/nn306/stanleyreynolds/planB.jpg
Reduced VE2ZAZ controller to be used as a counter.
http://i307.photobucket.com/albums/nn306/stanleyreynolds/VE2ZAZreduced.jpg
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- Original Message
From: Bruce Griffiths [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, May 22, 2008 4:26:43 PM
Subject: Re: [time-nuts] Comparing Reference Accuracy
Stanley Reynolds wrote:
Block diagram of using
The prams for sample size could also be set in the sampling PICs you would
probably want to set them all the same.
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Disabling all the GPS receivers at the same time would allow a comparison of
the hold over of each. As we are also logging the temp and power some changes
in these would also help determine how good each DO is as far as stability.
Stanley
___
- Original Message
From: Bruce Griffiths [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, May 22, 2008 5:09:32 PM
Subject: Re: [time-nuts] Comparing Reference Accuracy
Stanley Reynolds wrote:
The prams for sample size could
- Original Message
From: Bruce Griffiths [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, May 22, 2008 5:33:40 PM
Subject: Re: [time-nuts] Comparing Reference Accuracy
Stanley Reynolds wrote:
Disabling all the GPS receivers
snip
I bought a couple of HP 59307A switches on eBay for $5 each plus reasonable
shipping.
They can be found regularly.
I was offered an HP 5334B for parts that was missing the cover and front
panel (including display and switches, resulting from an emergency landing
with the gear up, or
- Original Message
From: Bruce Griffiths [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, May 22, 2008 10:01:27 PM
Subject: Re: [time-nuts] Comparing Reference Accuracy
Stanley Reynolds wrote:
Stanley Reynolds wrote
- Original Message
From: Bruce Griffiths [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, May 22, 2008 10:01:27 PM
Subject: Re: [time-nuts] Comparing Reference Accuracy
Stanley Reynolds wrote:
Stanley Reynolds wrote
Found what I considered a deal on a 646 Dranetz meter, it has plenty of inputs,
3 phase, single phase A/C, and one each 200VPK A/C, 100VDC inputs. Dial-in
modem, RS232, and Printer interfaces for logging.
It appears to be working well but I had to look inside, found 3 leaking AA
nicad cells on
- Original Message
From: [EMAIL PROTECTED] [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Friday, May 16, 2008 1:46:50 PM
Subject: Re: [time-nuts] Dranetz meter
Where did you get the batteries?
Local hamfest, but for a higher price
Not me, I have too many power supplies now. But,
As they have remote voltage sensing and you need a panel anyway why not connect
long cables to put them under the table or where the noise is less of a
concern. As a plus you could have more space where you need it and the
flexibility to have a
Quality and design still play a large factor as I replaced several 12V RV bulbs
with new White High-Intensity LEDs and they all failed within the first 60 days.
- Original Message
From: Poul-Henning Kamp [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
I purchased this unit for the box and power supply, but now I hate to dissemble
it. Dallas Instruments was acquired by Lansmont.com which was acquired by
Pira/Ciba Expert Services I think, not much trace of the company or product
left on the web.
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 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
Web articles on jitter:
http://www.maxim-ic.com/appnotes.cfm/an_pk/2744
http://www.pericom.com/pdf/applications/AB036.pdf
http://www.vectron.com/products/appnotes/jitter.htm
The last reference appears to have practical method to measure jitter in fig 5.
This is very detailed method but beyond my
What I would want would be a count that measures the zero crossing of the PPS
signal and the next zero crossing of the 10 Mhz input ? This would be one
number every second as the output data.
Is looking at the zero crossing of the two signals OK?
Simple/low cost hardware to produce this
Thanks Pete not sure my wife will let another big box in the door. I was
thinking of some thing like this :
http://www.onsemi.com/PowerSolutions/product.do?id=MC100E137FN
a ECL 8-Bit Ripple Counter. And a 1Ghz oscillator make the measurement of
differences. This should get me to the 1ns
Not sure any calibration is needed as the measurement is + or - one count at
1Ghz and if we measure only the time to the next 10 Mhz pulse we have the rest
of the 1/2 or whole second to transfer data and reset the counter if we don't
allow for overflow. We could skip every other pulse if more
More thinking out loud ... if the 1Ghz-2 Ghz oscillator is phase locked too the
10 Mhz signal then we reduce the error ?
- Original Message
From: Stanley Reynolds [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Tuesday, April 15
I think you are talking about DVB-T this quote from
http://en.wikipedia.org/wiki/DVB-T
Time and frequency synchronization: the digital base band signal is searched
to identify the beginning of frames and blocks. Any problems on the frequency
of the components of the signal are corrected,
snip
Using a ripple counter is a particularly bad idea, guaranteeing reliable
sampling is likely to be difficult to impossible unless the counter is
capable of reliable operation at several GHz.
The problem being the ripple clock propagation delay from one flipflop
to the next. For this counter
- Original Message
From: Bruce Griffiths [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Tuesday, April 15, 2008 7:54:21 PM
Subject: Re: [time-nuts] 5 MHZ PIC PPS Divider?
Stanley Reynolds wrote:
snip
Using a ripple counter
snip
Stanley
That application note will give you an introduction to metastability.
A pair of multi GHz D flipflops should ensure that the probability of
metastability is less than once in a hundred years or longer.
Just make sure you wait long enough for both the ECL and the extension
counters
From some data sheets, if the Vcc to the external Flip Flop is regulated
toward the high end of normal range the delay is reduced but not sure abt the
jitter, my guess is they are inversely related but maybe a smaller delay means
less jitter even if it increases in % of the delay. If you used a
Does anyone know the status ?
Google turned up this PDF
http://nvl.nist.gov/pub/nistpubs/jres/110/2/j110-2lom.pdf
Which states:
NIST ended its Geostationary Operational
Environmental Satellites (GOES) time
code service at 0 hours, 0 minutes
Coordinated Universal Time (UTC) on
January 1, 2005.
Why not use RS232? Several issues come into play. One is that driving long
cable runs with large voltage swings slows down the transition. Another is that
many receiver designs use slew rate limiting capacitors in an effort to reduce
noise coupling. These capacitors of course introduce delays,
Have dumped the EPROM and made several passes with the dissembler to separate
the data and code.
Total code and data is 0x1823 bytes.
Some text decoded thus far :
;
L0216: DB '.5 MHZ RECEPTION SELECTED.'
;
L0240: DB '.10 MHZ RECEPTION SELECTED ..15 MHZ RECEPTION
My search on Google did not turn up much, some pictures of james knights but
not the one you have and a note that at least one octal oven had the crystal on
pins 4 and 6.
http://www.leedsradio.com/images-odds/JamesKnights_JK013S25.JPG
http://www.leedsradio.com/images-odds/JamesKnights_JK02.JPG
- Original Message
From: Luis Cupido [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Tuesday, February 26, 2008 6:53:12 AM
Subject: [time-nuts] PC104 isa
Hi,
As there are experts here for sure I
risk this off topic question (it is not so
off topic in the application where it is used).
- Original Message
From: Chuck Harris [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sunday, February 24, 2008 8:51:01 PM
Subject: Re: [time-nuts] For Sale HP-8405A
Kind of looks to me like we are being spammed by an equipment
I enjoy the memories this thread brings back, and the different view points
that each of us had. I too had my favorites but found my self working on some
strange choices. Just like today many projects that are one off the platform
maybe selected for only one reason it's presence. I often would
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