Pete Rawson wrote:
Gentlemen,
You've hit a topic I've become more confused about after
researching some of the original papers on this subject.
Here are a few questions which I would like to become
educated about.
1) Will the calculated results of ADEV, ODEV, MDEV TOTDEV
suggest which
I've been a little lax in keeping my eye on the baby for over a day
but was astonished to see the display on GPSCon just a few minutes
ago. Things are usually very predictable with my EFC voltage showing a
linear downward slope but I was surprised to see that the trace showed
a very irregular
Steve,
I can only see the first screenshot, all the rest ask for a username and
password.
Best 73's
Nic
VK2KXN / VK5ZAT
Trace 1 is 72 hour period.
http://homepages.slingshot.co.nz/~sar10538/GPSCon_export_72h.png
Trace 2 is the 36h before the event.
Sorry, my bad, the links on traces 2-4 are incorrect.
I've been a little lax in keeping my eye on the baby for over a day
but was astonished to see the display on GPSCon just a few minutes
ago. Things are usually very predictable with my EFC voltage showing a
linear downward slope but I was
Seems that things have started to return to some normality but
variations in the EFC are very high. The status line from the unit as
reported shows everything is OK and it's tracking 7 sats.
Trace of proceeding 60h from current time 1st Feb 10:30 UTC
Magnus
Magnus Danielson wrote:
Tom,
Tom Van Baak wrote:
Magnus,
Correct, all the terms cancel between the end points. Note
that this is exactly equivalent to the way a traditional gated
frequency counter works -- you open the gate, wait some
sample period (maybe 1, 10, or 100 seconds) and
Hi
Are you interested in simple tip over compensation or are you really after
vibration compensation? If so, to how high a frequency? To what levels of
vibration? On what sort of oscillator?
A fairly simple 2G 3 axis accelerometer can compensate just about any
oscillator for tip over. There
http://wiki.eth-0.nl/index.php/LackRack
(Please try to avoid a long wandering thread on this one...)
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can
Hi,
I have some Motorola K1516AA, 10MHz, VC-TXCO devices (date-coded 1988)
but with only a basic pin-out diagram to their name and am wondering if
anyone knows a little more about them. Specifically I'm concerned with
the apparent high output-Z which means that a sniff of 'C' or a tad of
loading
While we are briefly back on the subject of IKEA, I recall someone
commenting that IKEA does not do web sales. According to the catalog my
better half received a couple of weeks ago, in the States it is
www.ikea-usa.com for web sales. But I admit I haven't tried it out, yet.
Regards,
Tom Holmes,
Hi
They are available for order on the internet in the USA. I just ordered a
couple for putting the Symmetricom boxes into.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Tom Holmes, N8ZM
Sent: Monday, February 01, 2010 10:57 AM
Hi
From what little I can find, the oscillator is specified as a sine wave
output into a 1K ohm resistive load. The supply voltage shows up as 8 volts
and as 9.6 volts. I have seen other oscillators specified as high as 10K ohm
resistive load, so 1K isn't as crazy as it might first sound.
Back
Magnus,
I see there are other versions of the Rubiola paper:
http://www.femto-st.fr/~rubiola/pdf-articles/archives/2004-arxiv-0411227v2-counters.pdf
http://www.femto-st.fr/~rubiola/pdf-articles/journal/2005rsi-hi-res-freq-counters.pdf
I was digging through the rubiola site.
Some good stuff
On Mon, Feb 1, 2010 at 1:29 PM, Tom Van Baak t...@leapsecond.com wrote:
Magnus,
I see there are other versions of the Rubiola paper:
http://www.femto-st.fr/~rubiola/pdf-articles/archives/2004-arxiv-0411227v2-counters.pdf
I noted this while looking for a DDS VFO, and thought it interesting and
affordable if you are interested in a 60khz WWVB receiver kit for $30 plus
postage. As a standard disclaimer, I have no affiliation with the gents
producing the kit. The URL is: http://www.qsl.net/k5bcq/Kits/Kits.html
Hi Tom:
You can NOT order lamps in the U.S on line.
Have Fun,
Brooke Clarke
http://www.PRC68.com
Tom Holmes, N8ZM wrote:
While we are briefly back on the subject of IKEA, I recall someone
commenting that IKEA does not do web sales. According to the catalog my
better half received a couple
Hi Chris: Maybe used to be PCB's (yuck) You can use mineral oil, available
at your friendly drugstore. Make sure everything is covered, leave a
little for thermal expansion, don't need too much airspace. Use 'em on a
paper towel, and if they are over full, they'll leak out the pinhole that
lurks
What I have seen in the old text books is that these resistors all sit in a
tub with oil around them. The oil is at some higher temperature.
I have a few of these resistors and no oil in them nor will I be putting oil
in them.
They seem to work to the limits of resolution of my test gear. 5.5
Hi
I do believe the last (or maybe next to last) of the Amtronix E8285A's is
now on it's way to a basement in Pennsylvania. If anybody else here is
looking for one, I'd sure call Rick pretty quick.
Bob
-Original Message-
From: time-nuts-boun...@febo.com
I've seen similar results when the receiver switches satellites.
Multipath??
On Mon, 1 Feb 2010 23:43:01 +1300, Steve Rooke sar10...@gmail.com
wrote:
Seems that things have started to return to some normality but
variations in the EFC are very high. The status line from the unit as
reported
Just bought one last week. As advertised, came with a cal and checkout
sheet. BTW, cost another $150 to have manuals printed out. But, I'm old
fashioned and have a hard time using manuals onscreen...
I also got the feeling (phone order) that I can call Amtronix and at least
reach a Real Person
sounds like you are off to a good start. the 5345A is a great counter other
then size and the fan, check the Yahoo
Tektronix group for changing all the nasty caps in the 2465, they have a
habit of failing and destroying the circuit
board. I believe someone even has the parts list of what to
Hi
I *suspect* that any size that was common in 2003 will be ok. I have no basis
for that claim. That likely will limit you to 2 gig and down.
Each time I called Amtronix, Rick answered on the first ring. It's definitely
someplace I would recommend dealing with.
How's the display on your
Plain old mineral oil, also known as paraffin oil, as can be found in any
drugstore.
They should be filled above the element, but not quite full. Maybe 3/4 to 7/8
full. It isn't really important.
-Chuck Harris
Chris Erickson wrote:
I bought some old Leeds Northrup standard resistors on
Bruce,
Bruce Griffiths wrote:
There are some excellent papers on the subject; start with
the one by Rubiola:
http://www.femto-st.fr/~rubiola/pdf-articles/journal/2005rsi-hi-res-freq-counters.pdf
There are additional papers (perhaps Bruce can locate them).
In particular, there is one
Hi
Some drug store mineral oil has extra stuff in it. This is one case where you
want the cheap generic version rather than the improved name brand.
Bob
On Feb 1, 2010, at 5:56 PM, Chuck Harris wrote:
Plain old mineral oil, also known as paraffin oil, as can be found in any
drugstore.
Unfortunately can't download these
On Mon, Feb 1, 2010 at 6:06 PM, Magnus Danielson mag...@rubidium.dyndns.org
wrote:
Bruce,
Bruce Griffiths wrote:
There are some excellent papers on the subject; start with
the one by Rubiola:
paul swed wrote:
Unfortunately can't download these
You need the IEEE UFFC account. Now you know why I have mine. Those two
articles is fairly short, so getting an UFFC account for those alone is
kind of meaningless.
Cheers,
Magnus
___
time-nuts
Hi Bob. Display shows use, definitely, but I can see info over the whole
tube. I have a couple of things to do before I can start the learning
curve, but am looking forward to using it.
I'll have a bunch of test stuff for sale if this thing works out ;-)
Don
Bob Camp
Hi
I *suspect* that any
Hi Brooke...
Ah, so I see. Curious that they have 200+ in stock at the store 40 minutes
away from me. Maybe they don't ship cheaply or without high risk of
breakage.
But enough conjecture for this reflector; on to the fun stuff!
Thanks!
Regards,
Tom Holmes, N8ZM
Tipp City, OH
EM79xx
Hi
The big question in my mind about these is how well they do below 30 MHz. Until
I know I can trust them it down there, I'm not selling very much stuff.
I have yet to find a data sheet from before 2000 when they shipped with the
sub-800 MHz stuff enabled. I get the impression that the
On 2 February 2010 11:11, Matt Osborn kc0...@msosborn.com wrote:
I've seen similar results when the receiver switches satellites.
Multipath??
It does that all the time as sats come in and out of view but I've
never seen an event of this magnitude before. If you look at the trace
for the
Go to your public library and request the articles via interlibrary
loan. I recently got Oliver Collins paper on Low Jitter Hard Limiters
that way. Depending on your library's policies it might be free or cost
a few dollars. It cost me $2.50 for photocopying. I'm not sure if you
can get
Hi
Ok, next up on the dual mixer stuff is checking the limiter chain. To do that
with any chance of the results meaning anything you need a good triangle wave.
You certainly can build some pretty complex gizmos to make them. There also
appears to be a fairly simple approach.
If I take a
Bob Camp wrote:
Hi
Ok, next up on the dual mixer stuff is checking the limiter chain. To do that
with any chance of the results meaning anything you need a good triangle wave.
You certainly can build some pretty complex gizmos to make them. There also
appears to be a fairly simple approach.
If goggle HP 8285a spec, you will get HP spec which say this unit is 800
Mhz up. The 8920, 8921, 8025 will go down to ham freq.
Regards,
Dr. Joseph G. Palsa P.E.
Director, Sales Marketing
Clary Corporation
Phone: 888-442-5279
Phone: 804-674-0364
Fax: 804-674-0714
Cell: 804-350-2665
Hi
At least from the last time I tried it:
If you use a sine wave input source, it's got to be an amazingly good 10 Hz
sine wave. A normal audio generator will not produce a 10 Hz output with good
enough short term stability / noise to give you useful data. Audio generators
may be out there
The early production E8285A units operate all RF functions down to 100KHz.
You have to ask the seller to verify what he's offering operates this way.
Pete Rawson
On Feb 1, 2010, at 8:18 PM, k3...@aol.com wrote:
If goggle HP 8285a spec, you will get HP spec which say this unit is 800
Mhz
HI
I agree. The 800 MHz spec was all I could find. That's the only spec that
Google seems to know about.
Back before some point like mid 2001, there was a different spec on these
boxes. They went down to much lower frequencies. That information is still
preserved in the repair manual.
Don,
Funny thing I bought a HP E8285A non-SA from Amtronix for $250 +
shipping as a RF source and spare parts for my $1200 HP 8935A...
Do you by any chance have a HP 8620A/B/C (or HP 8350B/11869A) and
HP 8709A/H10 and some 862xx RF plug-ins...(poor man's TG from .01 Mhz to
18 Ghz with the right
_Click here: RE: [Repeater-Builder] HP E-8285A Service Monitor_
(http://www.mail-archive.com/repeater-buil...@yahoogroups.com/msg59646.html)
Additional info on monitor history.
Joe k3wry
This e-mail (including any attachments) is intended only for the use of
the
individual or entity
Steve,
I'm much more wizened than wise, but my understanding is that crystal
jumps do not come back. They stay at their new frequency. I did
notice on your graph of the event that there were changes in the sat.
constellation at the beginning and end of the anomaly.
I've seen similar moves on
The stuff in the store generally has Vitamin E in there as a stabilizer, and
sometimes fragrance if marketed as baby lotion. Get the stuff for use as a
laxative and it *should* be okay. I had to buy tens of gallons of this
stuff from the local pharmacies because the local national laboratory saw
Bob Camp wrote:
Hi
At least from the last time I tried it:
If you use a sine wave input source, it's got to be an amazingly good 10 Hz
sine wave. A normal audio generator will not produce a 10 Hz output with good
enough short term stability / noise to give you useful data. Audio generators
Amtronix did tell me that the power measurements were off, according to some
folks who had compared them to Birds. Of course the E's could be
calibrated. I don't have much below 30 MHz at present either. I sense that
there may be enough around to warrant a Yahoo or Google group???
Don
-
Oh, forgot. My firmware appears to be something like A.02.4 or something
like that, and the manuals are A.05.0 or so. another possible problem.
Don
- Original Message -
From: Bob Camp li...@cq.nu
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent:
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