Gee, one would have thought he would have been proud of us
I tell everyone I'm a 'Time-Nut.' They agree.
=Don
-
-Original Message-
From: Ulrich Bangert
Sent: Thursday, November 29, 2012 1:28 AM
To:
Chris,
Put a ohmmeter across any of the capacitors on the GPIB board and see what
the resistance is. Since that kills the unit, I suspect the resistance is
low (?shorted tantalum) or there is a problem with one of the chips that
takes the 5 VDC buss down. Make sure of the polarity of
29/11/2012 09:30
The replacement for the missing U6 chip arrived this morning and it
now completes the 200 MHz self test It will read up to the limit of my
frequency generator on Band 3 which is only 1040 MHz, but looks
promising.
Band 2 also works, but seemingly has an anomaly. I cannot get
29/11/2012 09:40
I don't think this is an issue, but thought it best to ask. I am
repairing an 18GHz counter and it has a 10MHz external reference port.
So does my elderly Marconi 2019A sig gen. Is there any potential issue
having them both referenced off my Thunderbolt GPS referenced
I was told specifically not to mention the name of the list in my articles by
the list owner.
The point being to avoid an inundation of people with only casual interest.
Simon
Engineering is the art of making what you want from what you can get at a
profit.
sounds as if it were a group of criminals or so.
Time bandits.
Simon
Engineering is the art of making what you want from what you can get at a
profit.
From: Ulrich Bangert df...@ulrich-bangert.de
To: 'M. Simon' msimon6...@yahoo.com; 'Discussion of precise
Hi
Would be nice to use something like the ADS1278.
http://www.ti.com/product/ads1278
Lots of channels to cross correlate, and very little flicker noise.
Bob
On Nov 28, 2012, at 9:29 AM, Support HpW-Works.com supp...@hpw-works.com
wrote:
Hi Bruce,
The equivalent phase noise (measured
I had the same problem with my 545A, and it turned out
to be a tin whisker thing. Scrub both the GPIB card, and
the main controller card with a brush, and then blow them
off with compressed air. Try to get the air close to each
chip and socket, and blow from all angles. Plug the cards
back in,
It sounds like a SW limit, not hardware.
Silly question: Have you read the manual?
-John
=
29/11/2012 09:30
The replacement for the missing U6 chip arrived this morning and it
now completes the 200 MHz self test It will read up to the limit of my
frequency generator on Band
Good heavens, no. By doing so, they both have the same reference and the
measuremets actually means something. I have a stack of HP stuff (3586, 3386
and assorted counters) all T'd off my Tbolt without issue. The only caveat is
that you don't put too much stuff across the T-bolt output so as
...yeah - it's better not to know those people ;-) ...
Am 29.11.2012 08:28, schrieb Ulrich Bangert:
Simon,
...which prefers to remain anonymous...
sounds as if it were a group of criminals or so.
Best regards
Ulrich Bangert
-Ursprüngliche Nachricht-
Von:
It sounds like a SW limit, not hardware.
Silly question: Have you read the manual?
-John
29/11/2012 15:31
Hi John, will re read the section on limits, but please see my reply
to Chuck I just posted. Cheers.
--
Best Regards,
Chris Wilson.
Good heavens, no. By doing so, they both have the same reference
and the measuremets actually means something. I have a stack of HP
stuff (3586, 3386 and assorted counters) all T'd off my Tbolt
without issue. The only caveat is that you don't put too much stuff
across the T-bolt output so
29/11/2012 09:30
The replacement for the missing U6 chip arrived this morning and it
now completes the 200 MHz self test It will read up to the limit of my
frequency generator on Band 3 which is only 1040 MHz, but looks
promising.
Band 2 also works, but seemingly has an anomaly. I
Chris wrote:
I have the 10MHz output from David's divider feeding the counter. When
fed from this the Band 2 seems unreliable starting at 10MHz. If I feed
it 10Mhz at 50mV from my sig gen it starts reliably. Is it a mismatch
from the divider, or has it perhaps not got enough drive level?
Sorry, Ulli, if I'm not quite with it, today...
Which one is the bad guy now, the oven or the RX? We can't decide that,
can we? IMHO does neither the EFC nor the PPS TI response tell us,
whether the RX or the Crystal caused this peak, what we see is just the
difference time between them.
Two rules to follow. 1 - use well shielded cables for the 10 MHz
distribution
if you wish to receive WWV 10 off the air. The skinny cables used for
Ethernet
generally don't cut it.
2. Most instruments have a high impedance 10 MHz input. Put them in
the middle
with T connectors left over
Hmmm you run the risk of deafening the counter with 5Vpp (2.5V into 50R).
Dave
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Chris Wilson
Sent: 29 November 2012 15:57
To: Discussion of precise time and frequency measurement
Subject:
OK. It maybe time for the hair dryer and freeze spray. Also, try
re-seating any socketed chips.
-John
==
It sounds like a SW limit, not hardware.
Silly question: Have you read the manual?
-John
29/11/2012 15:31
Hi John, will re read the section on limits, but please see
At 03:56 PM 11/29/2012 +, you wrote:
By theory, yes... but we use a sound card with a lot of flicker noise
on the lower
end, also we have the 10...20Hz low freq. cutoff due the usage of a
servo / single
5V power. Also the raising noise below 100Hz (ADC serve noise on the
ADC power /
Chris wrote:
I have the 10MHz output from David's divider feeding the counter. When
fed from this the Band 2 seems unreliable starting at 10MHz. If I feed
it 10Mhz at 50mV from my sig gen it starts reliably. Is it a mismatch
from the divider, or has it perhaps not got enough drive level?
Hi all,
I recently gave in and bought one of the EES (european electronic systems)
RC1454 Radio Clock units that have been on ebay.co.uk for a while. The one I
snagged came with a GPS antenna unit. The main unit has a label saying GPS
Modified The main box appears to be a MSF receiver but has
Kind of funny you bring that up. I have an old Fluke 1900A counter (plastic
case) that radiates 10mhz clock that deafens my receiver. It only took me a
week to find the intermittent source of interference Boy, did I feel
stupid...
-
Date: Thu, 29
I'm selling a few of these cards. See eBay item 321033088669
I also have a quantity of the bath tub style from HP 5061 Cesium
standards. (If I remember 5, 8, and 3uf available)
Built specially for long time constant integrators.
Corby
Hi Robert
For some reason I missed these until you mentioned them but have just taken
a look and am reminded very much of the similarly modified and boxed EES
100s that Connect Distribution were selling around 5 years ago.
Whilst this looks to be a much later unit both EES and Radiocode
Is that ADO27B op-amp module on the PCB the same one used in the degausser for
the HP 5061 high performance tube?
Robert G8RPI.
From: cdel...@juno.com cdel...@juno.com
To: time-nuts@febo.com
Sent: Thursday, 29 November 2012, 19:32
Subject: [time-nuts] Special
Chris wrote:
Band 2 should work from -20dbm (22mV RMS) right across its 10 MHz to 1
GHz range according to the manual. Even with 190 MHz into it it takes
at least 30mV to start triggering, sometimes up to 40 mV. 40 mV will
reliably fire it across its full range once it warms up a bit.
Band 1
On 29 Nov, 2012, at 02:32 , Charles P. Steinmetz
charles_steinm...@lavabit.com wrote:
This is a classic crystal jump. The crystal changed its frequency magically
from one second to the next and the software compensated for it
Here is another example of a 3805 having a bad moment. For
Rich
Did not see anyone respond. Are you still hearing the signal?
Paul
WB8TSL
On Mon, Nov 26, 2012 at 6:59 PM, Rich and Marcia Putz rp...@bnin.netwrote:
Hi all;
I 'm hearing Loran C signals here in northern Indiana this evening, I
guessing from New Jersey. Anyone else hearing these?
Rich
One of those items that I'm only getting displayed when I already have
the item no.
Even on ebay.com and having selected shipping to a US address.
Apparently, those folks have found new ways to avoid making millions of
US$ of selling fees,
as well as brilliantly cutting their customers
Well thas strange I looked at his offer and I see the tracor board and 2
caps?
On Thu, Nov 29, 2012 at 6:36 PM, Adrian rfn...@arcor.de wrote:
One of those items that I'm only getting displayed when I already have the
item no.
Even on ebay.com and having selected shipping to a US address.
...and I should see the loop time constant in the ADEV, too - if that is
the case, the time constant should be about 2000 s, shouldn't it? (see
picture)
Volker
Am 29.11.2012 05:35, schrieb Said Jackson:
Volker,
This is a classic crystal jump. The crystal changed its frequency magically
Sadly, no. Different number and it looks like pin-out as well.
On Nov 29, 2012, at 6:06 PM, Robert Atkinson robert8...@yahoo.co.uk wrote:
Is that ADO27B op-amp module on the PCB the same one used in the degausser
for the HP 5061 high performance tube?
Robert G8RPI.
Could be either. What is the band width of Band 2? I am not in front of my
counter.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Chris Wilson
Sent: Thursday, November 29, 2012 9:57 AM
To: Discussion of precise time and
HI
Some simple empirical data:
1) Jumps tend to get further apart as the oscillator ages.
2) AT's have larger jumps than SC's.
3) A typical SC jump is below 1x10^-9
4) It's not a lot of things (spurs, drive, temperature, load,stress,
micro-fractures, plating defects) if you need to explain all
You will never find a more wretched hive of scum and villainy...
'Ben' Kenobi describing the Mos Eisley spaceport
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of Volker Esper
Sent: Thursday, November 29, 2012 07:20
To: Discussion
Bill,
One way to avoid the problem in the 1/f noise region is to avoid it.
Mix down to a few kHz and analyze you signal
This is a good point! Using my SW (www.hpw-works.com) simple set the x-scaling
to a
center frequency bandwidth of your choice with enough space in the lower
region.
This
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