-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ed Palmer
Sent: Thursday, July 26, 2012 12:43 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 5MHz ocxo
I'm not the original poster with the dead oscillator
Take another look at flea bay. If you search for 5 mhz oscillator
and weed out the trash there are a few decent looking units.
As for repairing the original, go for it. You can't make it any worse.
I would use a utility knife to scrape away as much solder as possible
but don't use the
I haven't heard of that trick before, but it sounds interesting. What's
the wattage of your soldering gun?
Ed
On 7/25/2012 6:41 PM, Ron Ward wrote:
Hi:
If you want to de-solder the case, I have had success taking some #12 or
#14 bare copper wire ( standard solid conductor house-wiring
Back in April I talked about my experience with the Jackson Labs
GPSTCXO. One thing I described is how if the user messed up and didn't
disable serial echo as described in the manual, the GPSTCXO could get so
confused that it would reboot. They have recently released a new
firmware load that
Hi Nigel,
I don't have any specific info on your oscillator. If I was doing it,
I'd investigate the oscillator and oven seperately.
Power just the oscillator and monitor the output while you slowly raise
the voltage from zero. Once the output appears, watch the amplitude as
you increase
A few years ago I bought an FE-5680A that had only a 1 PPS output - no
10 MHz. The part number is the same format as yours. It came on a
Motorola circuit board (not cutoff). It is programmable over a wide
frequency range (typically 100 Hz to 15-20 MHz), but you have to bring
out the signal
Do I detect a hint of frustration, Chris? :-)
I agree with Rex's comments that the most likely reason for this is a
building block process of combining standard modules to meet a
customer's requirements.
Some years ago I came across a 10 GB hard drive that came from a family
of drives that
Boy, I haven't thought about Notes on the Network for a decade or two
but I used to refer to it all the time. I see that it's available here:
http://telecom-info.telcordia.com/site-cgi/ido/docs.cgi?DOCUMENT=sr-2275ID=229670761SEARCH
for the low, low price of only $700 - soft copy only, of
I've played with a Lantronix single port server and a Digi 16 port
server with no problems for simple COM port emulation. But I wonder if
they would work well with an NTP server. Has anyone tested that? Is
the network delay a problem due to either amount of delay or variation
in the delay?
.
Hope this helps.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ed Palmer
Sent: Friday, May 11, 2012 12:39 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Tbolt failure modes
Are there multiple
Are there multiple hardware versions of the Tbolt (other than the
Tbolt-E)? My Tbolt has an Intersil 232IBE dual TTL to RS232 converter -
similar to MAX232. It generates it's own -12V. This is the version
shown on Brooke Clarke's Thunderbolt page:
http://www.prc68.com/I/ThunderBolt.shtml
My unit has many connections between chassis and circuit grounds, most
of which look intentional. There are connections at the 1 MHz and 100
KHz BNC outputs (the 5 MHz output is transformer coupled). There's also
a connection at an SMC connector from the multiplier to the SRD final
Hi Magnus,
On 4/28/2012 5:37 PM, Magnus Danielson wrote:
Hi Ed,
On 04/28/2012 08:43 PM, Ed Palmer wrote:
First, I'd like to thank Magnus, Joe, Paul, and Ed for taking the time
to provide answers, ideas, and challenges to my assumptions. It has all
been very helpful. I'm still working on it so
Hi Gordon,
I checked the link. The contacts are the same family, but they're a
smaller version for use in connectors rather than soldered into a board.
Thanks,
Ed
On 4/28/2012 6:05 PM, Gordon Batey wrote:
Greetings to the time keepers,
We used to use those connectors way
back in the
Hi Don,
You know that we're going to be swapping many emails, don't you? :-)
On 4/29/2012 11:16 AM, Donald Henderickx wrote:
After following Ed Palmer's thread on 304b restoration,I was inspired
to get my GTC (tracor) 304b ser#279 going. It seems that the failure
of this unit was the break
Hi Ed,
On 4/29/2012 12:28 PM, ed breya wrote:
Yes, very nice pictures. That thing is really built and looks like it
should be easy to work on and experiment with.
I still have to say that I doubt the cavity is off-tune unless
something serious happened to it mechanically. Is it even
Hi Don,
On 4/29/2012 2:54 PM, Donald Henderickx wrote:
On 4/29/2012 1:36 PM, Ed Palmer wrote:
Thank you Ed,Paul,and Marco for the reply's
The foam I was referring to is or was around ceramic base were the
igniter wire goes . Yes my wire also broke loose however I do not want
to disassemble
PM, Ed Palmered_pal...@sasktel.net wrote:
Hi Don,
On 4/29/2012 2:54 PM, Donald Henderickx wrote:
On 4/29/2012 1:36 PM, Ed Palmer wrote:
Thank you Ed,Paul,and Marco for the reply's
The foam I was referring to is or was around ceramic base were the
igniter wire goes . Yes my wire also broke
Hi Don,
On 4/29/2012 6:41 PM, Donald Henderickx wrote:
On 4/29/2012 6:27 PM, Ed Palmer wrote:
Yes, there's a partial copy of the manual online. It's missing a few
schematics, but is otherwise complete.
http://sundry.i2phd.com/ServiceManual_304b.pdf
Ed
The bottom pin is not chassis ground
First, I'd like to thank Magnus, Joe, Paul, and Ed for taking the time
to provide answers, ideas, and challenges to my assumptions. It has all
been very helpful. I'm still working on it so I don't have a resolution
yet.
Second, pictures. If anyone is interested, check out
Paul,
On 4/28/2012 1:26 PM, paul swed wrote:
Ed
Several comments
Great pix with the right level of detail to actually see and analyze stuff.
Second what a find you have there. A real mans RB nothing small about the
gas cells.
Exactly. I can use this as an experimental platform for various
Bob,
On 4/28/2012 2:33 PM, Robert LaJeunesse wrote:
Ed, nice pix, thanks.
Looking at the Elko Varicon I have in hand (DXX455-1000-3) the contacts are
essentially hermaphroditic. This chassis mount housing gives up its contacts
fairly easily, just unbend a tab to release. Turn them 90 degrees
Wow! I stand corrected. I had no idea that they were that old.
Thanks,
Ed
On 4/26/2012 3:20 PM, Geoff Blake wrote:
Ed Palmer wrote:
but I don't think pop rivets had been invented when
they built this thing! :-D
Just as a matter of interest, the humble pop-rivet was first patented
in 1917
I wondered if anyone would ask for pictures. They'll be ready soon.
Ed
On 4/26/2012 6:21 AM, paul swed wrote:
Some pix of the rg would be great
On Wed, Apr 25, 2012 at 11:43 PM, Ed Palmered_pal...@sasktel.net wrote:
Paul,
Good suggestion, but I don't think pop rivets had been invented
Hi Ed,
On 4/25/2012 9:41 AM, ed breya wrote:
Ed,
I downloaded that service manual - an interesting read. So much stuff
was well-figured out even back then.
Yes, the building blocks were all in place and are still used today.
But when you look at some of the implementation details you see
, the second harmonic signal
should show up large enough for the circuit to detect sufficient S/N
ratio
and provide a valid lock indication.
Ed Breya
Ed Palmer wrote:
Could the drift be at least partially responsible for the lack of second
harmonic? A message on the list (
http://www.febo.com
made my bid.
Ed
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ed Palmer
Sent: Tuesday, April 24, 2012 12:55 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Antique Rubidium Standard
but it might be
similar and allow a means of 'tuning' the cavity.
Good luck.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ed Palmer
Sent: Tuesday, April 24, 2012 8:30 AM
To: Discussion of precise time and frequency measurement
Subject
Magnus,
On 4/24/2012 10:49 AM, Magnus Danielson wrote:
On 04/24/2012 07:55 AM, Ed Palmer wrote:
Hi Joe,
On 4/23/2012 9:45 PM, J. L. Trantham wrote:
Ed,
I am not familiar with the Tracor units, only the 5061A and B as well
as the
5065A. These units use the 2nd Harmonic as an integral part
, but is otherwise
complete. The URL is http://sundry.i2phd.com/ServiceManual_304b.pdf .
Ed
Ed Breya
Ed Palmer wrote:
Could the drift be at least partially responsible for the lack of second
harmonic? A message on the list (
http://www.febo.com/pipermail/time-nuts/2006-April/020562.htmlhttp
and signs that it's getting back to normal. Once you get
enough power, if the Rb cells are still good, the second harmonic signal
should show up large enough for the circuit to detect sufficient S/N ratio
and provide a valid lock indication.
Ed Breya
Ed Palmer wrote:
Could the drift be at least
Hi Magnus,
Please note, I goofed when I said that the drift was 30 ppt. It's 30
ppb, i.e. 3e-8.
On 4/23/2012 2:08 PM, Magnus Danielson wrote:
Ed,
On 04/23/2012 07:54 AM, Ed Palmer wrote:
I'm playing with a Tracor 304-B Rubidium Standard from 1969. I'm using
it as a learning exercise
it can 'lock' without a 2nd Harmonic Signal.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ed Palmer
Sent: Monday, April 23, 2012 12:54 AM
To: Time-Nuts
Subject: [time-nuts] Antique Rubidium Standard Questions
I'm playing
the aging, the results start to look
like the earlier attachment. But not when it's unlocked.
Ed
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ed Palmer
Sent: Monday, April 23, 2012 10:17 PM
To: Discussion of precise time
I'm playing with a Tracor 304-B Rubidium Standard from 1969. I'm using
it as a learning exercise to find out more about the guts of a Rubidium
standard and how it works.
This thing is a beast! Rack-mount, 3U high, 39 pounds (~18 kilos), 9
plug in circuit boards. The OCXO is an oddball
to be On which is a handy feature when you use a common terminal
program for communication.
Best regards
Ulrich Bangert
-Ursprungliche Nachricht-
Von: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] Im Auftrag von Ed Palmer
Gesendet: Sonntag, 15. April 2012 07:18
An: Discussion
I recently had a chance to look at the GPSTCXO. I was quite impressed.
It's performance is a lot better than any bare GPS receiver, but maybe
not as good as some GPSDOs.
Here are some measurements that I made on the 1 PPS of the GPSTCXO and
other GPSDOs:
GPSTCXO Std. Dev. 400 ps.
in the same folder.
Good luck in your quest.
Ewing (Rix) Seacord
K2AVP/4/499
eseac...@verizon.net
845-628-0892 Home
914-262-9186 Cell
914-233-3886 Skype Notebook
On 4/7/2012 12:00 AM, Ed Palmer wrote:
Is there a pdf of the HP 5370B Manual that allows you to search for
text?
Thanks in advance,
Ed
Thanks John,
Unfortunately, that copy shows what happens when you don't do the
post-OCR editing. It was created with Adobe Acrobat which has really
poor editing capabilities. There are so many errors that I would be
uncomfortable if I had to rely on the text. The errors would cause me
to
Thanks Dave,
Is this the 134,440,033 byte one that's already on Didier's site (
http://www.ko4bb.com/manuals/index.php )? I've already taken a look at
that one.
Ed
On 4/7/2012 5:32 AM, Dave M wrote:
From: Ed Palmer ed_pal...@sasktel.net
Is there a pdf of the HP 5370B Manual that allows
Hi Paul,
I'm sure you've followed the discussions in the past on Tbolt
performance tuning. Have you jumped through all the appropriate hoops?
Things like precision survey, autotune the oscillator parameters, good
antenna visibility, mask angle, etc. come to mind. Having said that,
I've
Is there a pdf of the HP 5370B Manual that allows you to search for text?
Thanks in advance,
Ed
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time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the
Hi Said,
On 3/30/2012 10:53 AM, Said Jackson wrote:
Hello Ed, Azelio,
We should also compare the same parameters. Sawtooth error of the m12+ of
+/-25ns is not its standard deviation, it's max/min. Compare that number to
your 30ns max/min measurement on the 5372a.
Yes, you're right. Thanks
The Handbook of Frequency Stability Analysis and the Stable 32 manual
are hard copies of the pdfs that you can download free from his web site
( www.wriley.com ).
Ed
On 3/26/2012 2:34 AM, Rex wrote:
On 3/24/2012 3:54 PM, Magnus Danielson wrote:
and the Hanbook of Frequency Stability
Thomas, where did you buy your CW-12? AFAIK, the Motorola version of
the CW-12 is a 'special order' item. You can only buy the NMEA
version. If you did buy the NMEA version, ask their tech support for
the Motorola firmware. They sent it to me and I flashed it with no problem.
If you
That's the same place I got mine. They made the same mistake, but
helped me get the Motorola firmware. The CW-12 is also available from
Janus Remote Communications (Navsync and Janus are part of
Connor-Winfield). They have two warnings on the CW-12 page about the
Motorola firmware.
As for
Yes, the CW12-TIM was designed as a drop-in replacement for the M12+.
Search the archives and you'll find out more about it. One thing to
note is that the CW12-TIM doesn't support sawtooth correction so the 1
PPS may or may not be an improvement over the M12+.
Ed
On 3/23/2012 3:16 PM, Tom
Sorry Thomas. I don't know a thing about the Commsync II. See what you
can dig out of the manuals. Ultimately, you might have to bite the
bullet and buy a CW12 to try it. Sometimes that's the only way to find out.
Ed
On 3/23/2012 6:10 PM, Tom Knox wrote:
Thanks Ed, My Commsync has the
Hi,
I'm investigating a Tracor 308-B standard. I can see the modulation
frequency, but there's no trace of the second harmonic so the unit won't
lock.
I opened up the physics package and the lamp does light, but it's very
weak. Has anyone tried to rejuvenate one of these bulbs by heating
I see that William Riley ( author of Stable32) has published a book on
Rubidium Standards. Has anyone seen a copy? Any reviews?
http://www.lulu.com/product/paperback/rubidium-frequency-standard-primer/18171341
I don't have any connection to Mr. Riley or Lulu Marketplace. Can't
even afford
Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ed Palmer
Sent: Tuesday, March 13, 2012 2:48 AM
To: Time-Nuts
Subject: [time-nuts] Book by William Riley
I see that William Riley ( author of Stable32) has published a book on
Rubidium Standards. Has
I thought the same thing but I think Mark was referring to the end date
of the Mayan calender. Now those guys were Time-Nuts!!
Ed
On 2/8/2012 12:09 PM, David C. Partridge wrote:
Hey, you're not supposed to actually read those planning applications for
hyperspace bypasses!
D.
-Original
Hi Ulrich,
I've only had my 5370B for a couple of months so I'm still learning it's
tricks. How do I set up this high resolution mode? I've looked
through the manual and app notes and I'm just not getting it.
Ed
On 1/21/2012 11:13 AM, Ulrich Bangert wrote:
Magnus,
The end result will
You may remember my rant a few weeks ago regarding the 10 MHz output
of the Navsync CW12 GPS receiver. The issue was that it was, by
design, slightly off frequency. Further testing showed that the
offset was also temperature-dependent. Although this doesn't affect
its usability for it's
I would expect the RF circuitry to handle a lower voltage without too
much trouble. However, a lower input voltage means it will take longer
for the ovens to come up to temperature. Until they stabilize, a lock
probably won't happen.
Once the unit has warmed up and locked, how low can you
Speaking of aging, can anyone explain FEI's spec for aging on the
5680A? 2e-11 per DAY? Seriously? Everyone else specs their Rb
standards in the Xe-11 range per MONTH. When I first saw it, I thought
it was just a typo, but it's in multiple documents and web pages and
it's been there for
On 1/9/2012 7:21 AM, gandal...@aol.com wrote:
Hi Roy
There's some very good stuff coming out of China via Ebay, but some does
come with confusion attached and it's probably best never to place too much
reliance on descriptions unless for items reasonably well known or with
relevant
. You might want to start a new message thread called something
like 'E1938A repair' to get the attention of the right people.
Ed
Bob
- Original Message - From: Ed Palmer ed_pal...@sasktel.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sunday
Thanks for the correction, Bruce. I made the mistake of thinking that
the Bridge Section was the only thing inside the puck. I should have
looked further.
Ed
On 1/9/2012 12:47 PM, Bruce Griffiths wrote:
Ed Palmer wrote:
On 1/9/2012 8:58 AM, Robert Benward wrote:
Hi Ed,
I just tracked
I recently purchased a Motorola STLN4096A with the HP E1938A
oscillator. I bought it for the oscillator only.
Then I got intrigued by the HP Z3817A GPSDO that's included. I've
reverse engineered most of it and I've got it running. The 1 PPS is
really good ( 1000 measurements, Std. Dev. of
Hi Azelio,
Thanks, but I already found that. I've moved quite a bit beyond that.
That message was one of the few in the archives that had any
significant info on this unit. For some reason, I find that surprising.
Ed
On 1/8/2012 11:33 AM, Azelio Boriani wrote:
Have you already this?
On 1/8/2012 12:19 PM, Azelio Boriani wrote:
OK, I wasn't able to find anything else. Moreover the STLN4096A seems to
have a Rb oscillator now from the usual 'bay vendor... so seems confusing
as the Z3817A may be the E1938A mounted on the PCB that can discipline it
or it is another type of unit
down and I need to repeat
the stimulus procedure. Anybody have any ideas?
Thanks,
Bob
- Original Message - From: Ed Palmer ed_pal...@sasktel.net
To: Time-Nuts time-nuts@febo.com
Sent: Sunday, January 08, 2012 12:20 PM
Subject: [time-nuts] HP Z3817A Reverse Engineering
I recently
Okay, I've cooled off - a bit. The bottom line is that the 10 MHz
output of the CW12 isn't appropriate for what I wanted to do. Ah, the
joys of reading and understanding a spec sheet!
But let's not throw out the baby with the bathwater. Although the 10
MHz output has it's issues for
Do you mean the reference oscillator for the 5372A? That was the
internal 10811 OCXO. Over a 1000 sec. run, drift wouldn't have any
affect on these numbers.
Ed
On 1/5/2012 12:54 PM, Azelio Boriani wrote:
Great, don't forget to specify what reference your measurements were made
from (or did
On 1/4/2012 2:14 AM, Hal Murray wrote:
I compared the OCXO output to the 10 MHz output of both a Z3801A and a
Tbolt and discovered that the CW-12's 10 MHz output is about 1.5e-11 (i.e.
1.5e-4 Hz) low in frequency. I emailed Navsync and they replied:
The CW12 Motorola Binary and NMEA
I've never said that the CW12 was a GPSDO. What I expected to get was a
noisy NCO that had an average frequency of 10 MHz. What I got was a
worthless noise generator.
What's the point of saying that it's steered by GPS when it's
off-frequency. What does that even mean? Does it steer the
On 1/4/2012 8:49 AM, Mike S wrote:
On 1/4/2012 9:29 AM, Ed Palmer wrote:
What's the point of saying that it's steered by GPS when it's
off-frequency. What does that even mean? Does it steer the frequency to
keep the error constant?
If it's constant, maybe they just need to re-spec
On 1/4/2012 9:00 AM, Azelio Boriani wrote:
The output frequency is programmable: try $PRTHS,FRQD,xx.xxxcrlf where
xx.xxx is the desired(?) frequency in MHz with 3 decimal places (they say
for 10KHz set 0.010).
Unfortunately, the frequency is programmable only with the NMEA software
load.
On 1/4/2012 11:13 AM, Said Jackson wrote:
Hi Ed,
Since the oscillator is typically free-running in an NCO, and periodically corrected by
phase drops to stay on frequency the error you are seeing may be caused be
the offset in your crystal, combined with the limited digital resolution of the
In the past I've mentioned the Navsync CW-12 GPS board. Oncore M12
drop-in replacement, 1 PPS ( measured Standard Deviation 5 ns., range
~ 30 ns. from min to max for 1000 measurements), and a 10 MHz output
that's 'steered by the GPS receiver'.
The recent discussions about a cheap, simple
Hi Don,
I'm assuming that you've checked for obvious things like bad solder
joints. After 20 or more years in that heat, anything is possible.
Luckily, the oscillator board doesn't have too many connections to
remove when you pull the board. I use a 20X magnifier to really get
close.
It's not paranoia if it's true! :-)
Take a look at the pictures for # 270725678037 . These boards don't
have the connector cut off of the corner of the board. Good eyes.
Ed
On 12/19/2011 12:47 AM, Peter Bell wrote:
Most of the parts (and their grouping) seem the same as the NTPX26AB -
Seems unlikely. They were probably scrapped rather than resold because
the original application is obsolete. Also, it would be a significant
job to take the module apart so that you could cut off the connector so
neatly. There are easier and faster ways to prevent reuse. Maybe the
Antonio,
I suspected something like that.
I realized that I've never done a similar test so I'm correcting that
now. Both the oscillator and the counter have been off for some time -
days for the counter due to equipment rearrangements and months for the
oscillator. I replaced the 04E
Charles,
My restart followed the same pattern as yours. Start high, go higher,
drift down, undershoot, recover. The start was 10 MHz +51 counts, rise
to +60 counts after 5 minutes, drift down to a minimum of +8 counts
after 90 minutes and recover to +11 counts after 10 more minutes for a
On 12/16/2011 5:57 PM, Charles P. Steinmetz wrote:
Larry wrote:
However, while counting the 10 MHz from my HP Z3801A and displaying
0.01 Hz resolution on my 1992, I can rap very smartly indeed with my
knuckles on the outside of the counter case (anywhere) and not change
the displayed count.
I haven't seen a capacitor with detents. Could the fine adjustment be a
multi-turn pot? I've seen detents with those. I looked at mine but
couldn't tell. A pot would mean voltage control. Maybe we could build
a GPSDC (GPS Disciplined Counter). Yes, I'm kidding. I think.
Ed
On
On 12/18/2011 12:00 PM, Charles P. Steinmetz wrote:
Ed wrote:
My 04E must be less stable than yours. I was monitoring a fully
warmed-up Efratom FRK rubidium and saw a drift of ~ 0.04 Hz (i.e. 40
counts) over two hours after I turned on my 1992 from standby. Are
more than one type of
Charles,
I don't know the answer to that question. Since it's a thermal issue,
it's a question of how long does it take for the temperature to
stabilize? 24 hrs. should be lots of time. I'd check it before going
to bed. A quick turn-on and measure won't raise the temperature much
and
Hi Antonio,
Between you and Charles, I'm getting the feeling that my 04E oscillator
is defective. Yours only moved 15 counts over a period of days from a
cold start. Mine moved 40 points in two hours from standby. I think I
have some testing to do.
Thanks,
Ed
On 12/18/2011 6:01 PM,
I bought a 1992 a few years ago and I've been quite happy with it. It
does have a few quirks, of course. Some good, some bad.
1. You can get a 10 sec. gate time and therefore .001 Hz resolution at
10 MHz by holding the 'up arrow' key for about 2 sec. It's in the
manual, once. If you
I got the Collins paper through my public library via an inter-library
loan. Give them the publication, date, page numbers, and title. I
think it cost me $5.
Ed
On 9/10/2011 4:20 PM, Tijd Dingen wrote:
Same here. Does anyone know of an alternative source for that paper by Oliver
Collins?
I usually add the following to my searches to reduce (but not
eliminate) the links back to ebay:
-ebay -auction -bid -paypal -buy it now
Other google tricks that I often use are:
1. quotation marks - match pages with this phrase. e.g. buy it now
2. plus sign - match pages with
John Don,
Thanks for your thoughts and ideas. Limited availability of different
sizes and shapes of vacuum bottle is a problem, but I'll be keeping
your ideas in mind when I make my selection.
Ed
On 7/30/2011 6:29 PM, J. Forster wrote:
[snip]
That will give you a static
I did find Pope's site earlier after looking for Dewar flasks on eBay.
They don't have one that's close enough in size to be worth the cost
premium over a standard Thermos bottle. Same with a Google search for
other Dewar suppliers.
The original Dewar had internal dimensions of
No, I didn't email OSA. I always assume that if it's available, it'll
be out of my price range. For example, I asked Symmetricom if it was
possible to upgrade the software in an X72 Rubidium to a newer
version. All it consisted of was reflashing. They said it could be
done for
I'm rebuilding an Oscilloquartz 8601 oscillator that has a smashed
Dewar. The 8601 is basically the same as an 8600, but with a different
connector arrangement.
Since I can't replace the original Dewar, I'm trying various vacuum
flasks to see which one works best. The differences are
On 7/30/2011 2:01 PM, J. Forster wrote:
I would avoid steel. It usually has higher thermal leakage than glass.
True, but at least I wouldn't have to worry about the stupid thing
breaking again!
The designers were concerned about size so they were limited in the
thickness of the foam plug
That's exactly what I'm doing. I've got two glass vacuum jars and one
steel. I'm playing with different types of foam - rigid vs. flexible,
various types, etc . I haven't tried the aerosol foam yet. I
understand that once you start to use the can it has a very limited
shelf
I don't think I would call the coarse tuning adjustment 'accessible',
but it does exist.
http://www.realhamradio.com/GPS-oven-journey.htm
Of course, before digging into a mess like that, check the standard
things like power supply voltages, outer heater current draw, bad solder
joints that
The HP 5370B is spec'ed for a single-shot time interval resolution of 20
picoseconds, not 10 nanoseconds. The Racal 1992 is only spec'ed at 1
nanosecond.
If you're thinking of buying a Racal 1991 or 1992, watch out for bad
switches. One type of switch that was used is failing due to age.
Not necessarily. I'm about 1200 Km straight north of Fort Collins. One
of my WWVB clocks has been having serious trouble getting a fix for the
past week or two. I thought it was just dying of old age.
Ed
paul swed wrote:
I must have hit a pot hole in propagation yesterday at 60 Khz.
Is there more than one hardware version of the T'bolt?
Mine has U18 (right behind the RS-232 connector) as an Intersil
ICL232IBE. This is a dual RS-232 transceiver that includes a doubler
and inverter to generate plus and minus 9 to 10 volts from the +5
input. It appears to have the
I have a 58536A. Although it isn't mentioned in the datasheet or
manual, mine has a DC load on each input. The load is four 1330 ohm
surface mount resistors in parallel, e.g. 332 ohms or about 15 ma @ 5 volts.
Ed
Robert Watzlavick.com wrote:
I thought the 58536A was supposed to provide a
Sounds like your friend is a customer for an anti-timenuts clock. :-)
Ed
Burt I. Weiner wrote:
Chuck,
In another post I spoke about spending a few days with a fellow from
DATUM. A lot of our idle chit-chat was about accuracy in timing and
GPS vs.other off-air standards and propagation.
The joke kinda falls flat when the picture isn't included.
Ed Palmer wrote:
Sounds like your friend is a customer for an anti-timenuts clock. :-)
Ed
Burt I. Weiner wrote:
Chuck,
In another post I spoke about spending a few days with a fellow from
DATUM. A lot of our idle
I give up!! Here's the link to the anti-timenuts clock! :-[
http://www.dayclocks.com/
Ed Palmer wrote:
The joke kinda falls flat when the picture isn't included.
Ed Palmer wrote:
Sounds like your friend is a customer for an anti-timenuts clock. :-)
Ed
Burt I. Weiner
Hi Stan,
According to Microsoft (who should know), NoSerialMice has never worked
with XP. It's for NT. For XP use /fastdetect:COM10 or just /fastdetect
to handle all com ports.
See: http://support.microsoft.com/kb/833721
Ed
Stan, W1LE wrote:
Hello The Net:
Since my motherboard died, I
There was a thread a few months ago comparing a few of the capabilities
of the 5372A and 5370(A or B).
http://www.febo.com/pipermail/time-nuts/2011-February/054302.html
Ed
W2HX wrote:
Forgive my ignorance here, but what can one use this for? Can it be used to evaluate oscillators? plot adev?
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