Moin,
The recent discussions have made it again clear to me, that i lack
a lot of knowledge in electronics. Especially when it comes to
the black arts: analog stuff, HF, getting the most ouf of a transistor,
or doing it really really low noise.
Could someone recomend anything to read that would
Attila wrote:
The recent discussions have made it again clear to me, that i lack
a lot of knowledge in electronics. Especially when it comes to
the black arts: analog stuff, HF, getting the most ouf of a transistor,
or doing it really really low noise.
Could someone recomend anything to read
On Sat, 11 Feb 2012 04:09:44 -0500
Charles P. Steinmetz charles_steinm...@lavabit.com wrote:
Attila wrote:
The recent discussions have made it again clear to me, that i lack
a lot of knowledge in electronics. Especially when it comes to
the black arts: analog stuff, HF, getting the most ouf
On 02/10/2012 06:56 PM, Bob Camp wrote:
Hi
I suspect that if you went into the GPS jamming business that the mob of
lawyers would be even more scary than the stuff being dropped on your
antennas...
Not even the US military could be that evil!!!
If you attempts that total jamming approach
Another suggestion if you are interested in analogic design is Sergio
Franco, Design with Operational Amplifiers and Analog Integrated
Circuits, McGraw Hill, 1988 (and other newer editions).
Common on ebay and amazon. Chapter 14 (noise in operational
amplifiers) has been very useful to me.
Information Transmission, Modulation and Noise by Mischa Schwartz.
___
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 instructions there.
Optimum noise immunity , Originally a Russian book but translated by
R.A. Silverman.
(somewhat dated, but very good coverage in
theory, heavy math,statistics and scientific method)
Due to the nature of the above book if you are not familiar with the
scientific of experimentation on a practicing
Hi
Another way to build an analog phase detector...
Next layer on the onion is how to get the sawtooth correction out of the GPS
and into your loop.
Bob
On Feb 11, 2012, at 12:05 AM, Chris Albertson albertson.ch...@gmail.com wrote:
All these different suggestions build down to one thing,
Gentlemen,
a few weeks ago a link to a new counter named U6200A was to be found here
in the group. I considered the technical properties of this counter (which
is sold under the brands Array or Picotest) that interesting at its
price that i ordered one immediately.
I did not buy it directly
Hi
If I hit the Acquire / U6200A entry in the Timelab menu will it buy one for me?
How noisy is it? Put another way, it has 40 ps resolution, how close can you
get to that in terms of accuracy?
Looks like a cool toy, thanks for sharing.
Bob
On Feb 11, 2012, at 7:52 AM, Ulrich Bangert
Ulrich Bangert-
a few weeks ago a link to a new counter named U6200A was to be found here
in the group. I considered the technical properties of this counter (which
is sold under the brands Array or Picotest) that interesting at its
price that i ordered one immediately.
+
On 2/11/12 12:43 AM, Attila Kinali wrote:
Moin,
The recent discussions have made it again clear to me, that i lack
a lot of knowledge in electronics. Especially when it comes to
the black arts: analog stuff, HF, getting the most ouf of a transistor,
or doing it really really low noise.
Could
This is the simplest part if a microprocessor can be used: by the serial
port you get the sawtooth correction in nS to be applied to the sampled
data. The sampled data must be converted to nS or the sawtooth correction
must be converted in a suitable sampled data correction. It is possible
even
My Z3815A doesn't have a leap second pending... maybe the Furuno GPS
receiver hasn't that information or the Z3815A doesn't retrive it. I'll
check the HP58503A at work.
On Sat, Feb 11, 2012 at 3:52 AM, Hal Murray hmur...@megapathdsl.net wrote:
It got here around 2785 seconds UTC after midnight
Indeed interesting but the 5370s seem to go for $300-400 and this $1750.
I had been lucky to get my 5370s pre-interest price accelerator so $50-75.
Because who would ever want such a heavy thing?
Much as I love the modern interfaces, size, quite, and low power
consumption. The boat anchors stay.
Getting very interesting.
Bob had mentioned just sample the 10 MC sine wave. What I used to do on
homebrew Loran C.
Thats easier to do because today its nothing to buffer that 10 MC signal to
drive a fast sample and hold. This eliminates the ramp circuitry and
constant current sources used in the
Is there a recommended way to remove the residue of what I presume was thermal
tape on the heatsinks of my various telco Rb units? It's a slightly tacky
light greenish layer. I'm guessing that for a permanent installation one would
want to remove that residue, smooth the surface, and replace
I wasn't clear below -- the residue is on the Rb exterior surface that attached
to the heatsink.
On Feb 11, 2012, at 11:52 AM, John Ackermann N8UR j...@febo.com wrote:
Is there a recommended way to remove the residue of what I presume was
thermal tape on the heatsinks of my various telco Rb
John,
Have you tried anything yet? As a first pass I would try something petroleum
based to clean. I know this has worked for me in the past.
Rob Kimberley
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of John Ackermann N8UR
Sent: 11
Maybe a thinner can help...
On Sat, Feb 11, 2012 at 5:58 PM, Rob Kimberley
robkimber...@btinternet.comwrote:
John,
Have you tried anything yet? As a first pass I would try something
petroleum
based to clean. I know this has worked for me in the past.
Rob Kimberley
-Original
There is a layer like that on my LPRO-101 that I think is the 'thermal
conductor' designed to 'connect' the unit to the heat sink.
Or am I disoriented?
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of John Ackermann N8UR
Sent:
I was hoping that they would add it at some week rollover point or at the
first of the month, etc. But it appears to just be random or whenever they
get around to it.
Connected by DROID on Verizon Wireless
-Original message-
From: Hal Murray hmur...@megapathdsl.net
To: Discussion
John:
If it is an adhesive tape residue or just an adhesive residue, the best,
paint safe, and non-toxic remover I am aware of is Goo-Gone. It is
some kind
mild solvent with a lot of citrus oil in it. Sold at grocery stores. Since
you own a house, I would be surprised if your wife does not
FWIWI used denatured alcohol and acetone. Just be sure to wear chemical
safe gloves and plenty of shop rags.
But it comes right off. Fumes are bad too.
Let the rags dry out before you put them in the trash.
-Brian, WA1ZMS
-Original Message-
From: time-nuts-boun...@febo.com
I've used WD-40 to soften adhesive gunk such that a paper towel can be used to
wipe it off.
From: John Ackermann N8UR j...@febo.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Cc: Time-Nuts time-nuts@febo.com
Sent: Sat, February
Looks like analog devices makes a pretty nice sample and hold chip. A bit
pricey.
But can't really work at 10 MC so that would complicate things
On Sat, Feb 11, 2012 at 10:54 AM, paul swed paulsw...@gmail.com wrote:
Getting very interesting.
Bob had mentioned just sample the 10 MC sine wave.
Perhaps goof off would work ? I've never used it on electronics but it seems
to do a good job removing residue from metal trim in buildings. I expect
there are hazards associated with this product so please take suitable pre
cautions.
--
On Sat, 11 Feb, 2012
The words leap second pending are not specific enough and I
hope there aren't still GPS receivers or API's that do this.
What most applications only want to know is leap second pending
this month. Some applications need to know is leap second
pending in future month X.
So one has to be careful
I was hoping that they would add it at some week rollover point or at the
first of the month, etc. But it appears to just be random or whenever they
get around to it.
Leap seconds are always applied at the end of the UTC day of the
last day of the month specified. So the next one will occur
Thanks, Brian. Sounds like a plan. I just wasn't sure if there was
anything special about the thermal material, as I've never worked with
it before.
BTW -- when you search for thermal tape most of the hits are for the
tiny square pads used on CPU heatsinks, but I did find one eBay seller
In message 34D15475EDD248D49D30FD70F9D927E4@pc52, Tom Van Baak writes:
What most applications only want to know is leap second pending
this month. Some applications need to know is leap second
pending in future month X.
Actually, there is a very important application that wants to know
as far in
On 02/11/12 04:52 PM, John Ackermann N8UR wrote:
Is there a recommended way to remove the residue of what I presume was thermal
tape on the heatsinks of my various telco Rb units? It's a slightly tacky
light greenish layer. I'm guessing that for a permanent installation one would
want to
How about using the 10KHz output from one of the Jupiter receivers as per
James Miller's simple GPSDO? There's TU60s available on Ebay from China
right now at reasonable prices.
regards
Nigel
GM8PZR
In a message dated 11/02/2012 18:04:22 GMT Standard Time,
paulsw...@gmail.com writes:
And how do you remove the silicone oil?
Ever heard the one about the hotel guest who complains about the mouse in
his room?
-John
===
On 02/11/12 04:52 PM, John Ackermann N8UR wrote:
Is there a recommended way to remove the residue of what I presume was
thermal tape on the
There are no temperature coefficient effects or calibration drift with
the current sources and ramp circuits in this case. Between 1 PPS
measurements, there is more than enough time to gate a sample waveform
from the convenient 10 MHz source to the time to voltage converter to
calibrate it.
One
Nothing new or exciting here, but I did some measurements of three GPS
sources -- M12+/TAC2, M12+/CNS Clock II with sawtooth correction, and
Z3801A -- to see what their short-term noise looked like, and got some
pretty pictures:
http://www.febo.com/pages/gps_pps/index.html
Thanks to John
On 02/11/2012 07:40 PM, Tom Van Baak wrote:
I was hoping that they would add it at some week rollover point or at
the first of the month, etc. But it appears to just be random or
whenever they get around to it.
Leap seconds are always applied at the end of the UTC day of the
last day of the
Try searching for thermally conductive adhesive gap filler to get a good
selection of manufacturers like Bergquist, Chomerics, Masterbond, etc.
From: John Ackermann N8UR j...@febo.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
I can confirm: my LPRO-101 has this thermal conductive green sheet too. I
think to retain it instead of getting rid but it is not in perfect shape...
On Sun, Feb 12, 2012 at 12:18 AM, Robert LaJeunesse
rlajeune...@sbcglobal.net wrote:
Try searching for thermally conductive adhesive gap filler
As requested, pics of the inside of my Morion XO00281M-CT-MV89 MV89A
double oven ultra precision OCXO, serial ZA5310, date 03/22. Sorry,
I didn't feel like peeling apart the outer oven.
Small pics (~50 kB):
http://n5tnl.com/time/mv89a/mv89a_1_small.jpg
The appnotes from LT especially Jim Williams articles. LT used to print these
in book form.
Check out the V to F designs, and the data acquisition stuff. Very practical
with real world components and test results. Very high end analog stuff.
Most textbooks are totally useless, the authors
Forgot to mention:
Searching amazon for Jim Williams returns a number of great books by Jim and
Bob Pease..
Sent From iPhone
On Feb 11, 2012, at 20:00, Said Jackson saidj...@aol.com wrote:
The appnotes from LT especially Jim Williams articles. LT used to print these
in book form.
Check
On 2/11/12 8:00 PM, Said Jackson wrote:
The appnotes from LT especially Jim Williams articles. LT used to print these
in book form.
Check out the V to F designs, and the data acquisition stuff. Very practical
with real world components and test results. Very high end analog stuff.
Most
t...@leapsecond.com said:
So one has to be careful how you handle this information. There is always
that awkward time, which we are now in, between when a future leap second
is announced and the actual month in which it occurs. It never fails that
some user or software misinterprets the IERS
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