I couldn't get the link to work (it just hangs).
However, I vaguely remember when we were starting
work on the 5071A that the reason why we used
the model number 5071A instead of 5070A was that
the latter number had been reserved for a hydrogen
maser that was never sold. The person in charge
of
On 2/24/2014 8:54 AM, Pete Lancashire wrote:
Does this hang ?
http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/
That works, but when i click on the actual link to the
actual, my browser still hangs.
Rick
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time-nuts mailing
Still doesn't work for me.
On 2/24/2014 8:57 AM, Had wrote:
http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09
.pdf
Rick, I got the above to work with no problem. The original link was busted.
Had
K7MLR
___
time-nuts
On 2/24/2014 1:59 PM, dlewis wrote:
The.pdf got caught up in a linefeed/carriagereturn
Wouldn't that problem result in a file not found error
rather than just hanging?
I eventually got the link to work from Internet Explorer,
which took 5 minutes to download it. It never worked
Solid dielectric cable and connectors of 3.5 mm size
are mode limited to 18 GHz. That is why there is
so much stuff rated at 18 GHz as opposed to 16 or
20 GHz. The next jump up is 26.5 GHz where 3.5
mm size works in air dielectric. It costs more
to make these components and the volume is
The trouble with ADEV is that if you average
a long time it papers over anomalous events
like crystal jumps. An alternative measure
might be to, instead of averaging, simply
keep track of the worse case change in frequency
during 1 sample period. Sort of like peak jitter
versus rms jitter.
I worked for the HP Santa Clara Division during
the Smart Clock days and knew all the players.
In terms of holdover, the report cited mentions
temperature compensation and learning aging.
The temperature compensation was simply a crutch
for the 10811 to fix its tempco problems. The
E1938A had
On 4/11/2014 11:04 AM, Hal Murray wrote:
How many would you need? Is 3 enough?
How well could you do with several low(er) cost oscillators relative to one
good but expensive one? It might be an interesting experiment in a nutty
sort of way.
My guess would be 3 would be a minimum, so you
It is very easy to make an impedance phase detector by
inserting a toroidal current transformer in series with
the load under test. The center of the secondary is
connected to the load through a capacitor. Each end of
the secondary goes to a diode detector. When the
load is resistive, the DC
My understanding is that a really good Rb standard
use a fairly wide bandwidth loop to control its own
internal XO, and therefore improve its close in phase
noise to be better than you can get with quartz alone.
The Rb standard is able to do this because the S/N
ratio of its rubidium vapor
I will be at Dayton this year.
I'll see if I can rattle the cage.
Rick N6RK
On 5/12/2014 6:32 PM, Robert LaJeunesse wrote:
Just a note that there will be some Time Nuts at the Dayton Hamvention this
weekend. Don't be surprised to run into one or more at Flea Market spaces FW
1902/3/4/5.
I was the Project Manager for the 5334B.
The A version (unlike the B version) has
a very weak power supply due to insufficient
capacitors and/or transformer. I can't
remember now after 25 years. When you
power it up with a cold 10544 or 10811, the
oven circuit looks like a 47 ohm resistor.
The
On 5/29/2014 9:15 AM, cdel...@juno.com wrote:
On these latest oscillators at the longer Tau (100sec.)
the Quartz versus Quartz data shows much better performance
than the Quartz versus Maser!
What is happening (I think) in this case is that both Quartz units
have exceptionally low and similar
will also look better than it really is, and for the same reasons. (Some
people have even reported similar behavior with cesium standards,
although I
don't see how that could happen. There aren't supposed to be any
first-order temperature effects in a CBT, and I'd think that any
lower-order
On 6/2/2014 7:43 AM, Attila Kinali wrote:
Also, any good resource on how to build a directional coupler that
does 10-3000MHz without going to exotic materials would be much
I once had the opportunity to discuss directional couplers with
Julius Botka, then with HP/Agilent. Specifically, a
On 6/2/2014 12:41 PM, Brooke Clarke wrote:
Hi:
I started with the HP 8410 and added an external computer.
Since it can be used manually I think it's an excellent way to learn
about VNAs.
http://www.prc68.com/I/MWTE.shtml#NA
For my last 8 years at Agilent before retiring in March, I
was doing
I did some tests of residual phase noise using an
Agilent E5505A and found that air coil inductors
did not add noise (at least down to my noise threshold)
but that ferrite core inductors had easily seen noise.
It was on the order of ADEV = 1E-10 close to the
carrier. I would describe this as
On 7/24/2014 9:37 AM, Tim Shoppa wrote:
The data and tests presented in this source:
http://www.cliftonlaboratories.com/imd_in_broadband_transformers.htm
is a great resource on measured large-signal performance of
binocular/toroidal transformers. One factor found that can really degrade
IMD
On 7/28/2014 1:12 AM, David C. Partridge wrote:
Back to time related discussions please.
Thanks
Dave
I worked on cesium standards (5071A)
at HP/Agilent with Len Cutler of flying clock
fame. You better believe that batteries are
time related. We jumped through all sorts of
hoops to get the
Without having seen the specific patent, what
worries me is that there is a trend these days
to write blanket patents that say you can't
build any black box that, for example, receives
this format, no matter how it works.
They don't have to prove what is
in your FPGA code. They then can shut
On 8/17/2014 12:30 PM, paul swed wrote:
OK
That said I shared the tracor d-msk-r circuit with the group that removes
the msk. How does it pull that trick off? I do not get how it gets rid of
the msk and leaves the carrier.
A common way to remove BPSK is to simply run the signal
through a
I am just speculating that this oscillator was used
instead of the 10811 because the 10811 would not fit.
Therefore, it would NOT be used in other equipment.
I would guess the specs would be similar to the 10811.
The 70,000 series had some general purpose power bus
that the McCoy would have to
On 10/1/2014 1:04 PM, Hal Murray wrote:
drkir...@kirkbymicrowave.co.uk said:
Anyway, later today (tomorrow ??) I will post a plot of frequency vs time.
The question is though, how long is thing thing likely to take too cool?
I'd expect an exponential decay so you need to specify how close to
- Original Message -
From: Richard (Rick) Karlquist rich...@karlquist.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Cc: hmur...@megapathdsl.net
Sent: Wednesday, October 01, 2014 9:03 PM
Subject: Re: [time-nuts] How long do ovens take to cool to ambient after power
On 10/7/2014 10:02 AM, Jim Lux wrote:
At work, I'm putting together a multichannel stepped frequency CW radar
breadboard, and I'm looking for something to serve as a source that I
can step quickly.
Possibly overkill, but Agilent has a very state of the art
arbitrary waveform generator that
This dispute reminds me of another one.
A long long time ago, .gif was the internet
standard for encoding photographs. Far and
away the favorite. Then the owner (was it
AOL?) decided to enforce their patent by
getting snotty with end users. Almost overnight,
.gif virtually disappeared off the
Hi, I was the designer of the board, but I don't remember the
part number of the reference. I will try to consult my paper
schematic when I get a chance, if no one else can help you.
I do remember that I originally used some convenient reference
which seemed OK from the data sheet, but turned
On 11/17/2014 5:54 PM, Bert Kehren via time-nuts wrote:
I ground one side of the tuning diode and use the 2 to 12 V as the external
OCXO for my FRK's along with increasing the time constant. I have not
verified it but I think removing the zener Voltage should also improve ADEV.
Bert Kehren
temperature ranges.
Mail_Attachment --
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Richard (Rick) Karlquist wrote:
On 11/17/2014 5:54 PM, Bert Kehren via time-nuts wrote:
I ground one side of the tuning diode
See:
http://newsoffice.mit.edu/2014/portable-atomic-clocks-1112
Any comments?
Rick Karlquist N6RK
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and follow the
I did some checking around for low noise buffer amps earlier
this year. They needed to have 200 MHz bandwidth, so this
isn't directly applicable to 10 MHz. I also needed isolation.
About the only information in print is from the usual suspects
at NIST. They wrote a series of papers taking a
On 10/13/2012 8:30 AM, Adrian wrote:
12V for the oven because inside the outer oven lives a 10811-60158 ( see
http://www.realhamradio.com/GPS-oven-journey.htm ) that, as by the specs
sheet, is specified 12 to 30 V DC, 11 W max. at turn on (mine draws some
9 W), and Steady state power drops to
The old Watkins Johnson M9 series was the state of the art for
stacked diode mixers. You can still get the M9E and M9H from
MaCom Technology Solutions. The M9E is better, but only if you
have the 1/2 watt! of LO drive needed. As you have done already,
it is probably possible to homebrew
On 11/23/2012 9:38 AM, Bruce Griffiths wrote:
NIST have shown (at least at 10MHz) that the high level mixers they
tested are noisier than the ZRPD1.
Bruce
Do you have a citation to where they said that?
What you quoted doesn't make sense, at least, out of context.
We need to clarify phase
I know this topic has been discussed in the past on the list, but
a colleague is asking if there are any off the shelf low
noise power supplies for testing oscillators. Something
a cut above an HP brick lab power supply etc. They are hoping
to avoid having to homebrew a power conditioning
One more thought: Many oscillators have internal regulators that are not
nearly as good as what you can build. No sense using an external supply
with 5 nV per root Hz noise density if it will be re-regulated inside
the oscillator by a circuit that has a noise density of 250 nV per root Hz.
On 3/17/2013 4:54 PM, Volker Esper wrote:
The HP seems to be the more modern design. As I guess, the analog
circuits are to blame, maybe HP was able to make use of newer technologies.
FWIW, the 53132A design goes back 20 years
Rick
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time-nuts
Actually, the opposite is true. Notches have the least phase
shift at the frequency being passed, which is what matters.
It is true that the phase shift at the notch frequency is
uncontrolled, but that is not important. The HP8662A
had an interesting PLL synthesizer where they had 10 notch
Richard (Rick) Karlquist:
Actually, the opposite is true. Notches have the least phase
shift at the frequency being passed, which is what matters.
It is true that the phase shift at the notch frequency is
uncontrolled, but that is not important. The HP8662A
had an interesting PLL synthesizer where
OK, so we seem to have:
1) Scotch 130 rubber tape
2) Scotch 33 electrical tape
3) Scotchkote
in that order.
So the rubber tape waterproofs
the connection and the scotch kote
protects it from UV, so what does
the electrical tape do?
Or maybe, the electrical tape does
the waterproofing and
On 4/14/2013 7:48 AM, Brian Davis wrote:
Not sure if it's already been mentioned, but Linear has introduced a new
part that looks interesting :
LTC6957 Low Phase Noise Buffer/Driver
http://www.linear.com/product/LTC6957-1
This is VERY interesting, especially the low noise PECL output. I have
At HP in the 1990's, Len Cutler's group built some experimental
mercury ion standards for USNO (IIRC). They were of the
trapped ion type. BTW, it is important to understand that
the architecture is the key factor, not the flavor of atom.
When people say rubidium is inferior to cesium, they
David C. Partridge wrote:
Cough - the rubidium clock or oscillator does have an intrinsic frequency,
which is the rubidium hyperfine transition of 6 834 682 610.904 324 Hz, it's
just that the frequency generated by the transition in question isn't used
to DEFINE the second, so by definition,
When the 5071A product line was sold to Symmetricom ~4 years ago,
the production manager and his team of 15 moved with the product.
The manager left Symmetricom a few years ago, and recently most
of the rest of the team left Symmetricom. The 5071A will now
be made on the east coast at the
Bruce Griffiths wrote:
Only if the noise figure of the following amplifier is 4dB or so.
With no extra amplification is used one only needs a signal level of
+1dBm to achieve a phase noise floor of -178dBc/Hz if the output is
extracted through the crystal in such a way that the thermal
Don Collie jnr wrote:
I`m not sure that questions like these is welcome on this list, but here goes anyway :
1/ What are the the 10 sources of the most constant [invariant] frequencies
known to man, in order of decreacing constancy? Four immediately come to mind.
I vaguely remember reading
It is entirely possible that a 10544 could have excellent aging and beat
a 10811. The SC cut doesn't improve aging. The other disadvantages
of the 10544 in terms of electronics also don't affect aging. The
main advantage of the 10811 is that it is much better from a cold start
in an
Bob Camp wrote:
Hi
Tough to believe that HP worried a lot about SKU inflation back when they
did the 5370 :)
I'm assuming that the 5370 was a Santa Clara design. That would put the
counter designers down the hall from the oscillator factory. Unlikely that
there was a communications gap
What the 10811 production line did was to compare two 10811's
to each other by driving a high level mixer. Anzac AM-123
amplifiers were used to increase the output level of the 10811's.
You can homebrew the AM-123 if you read the patent and can
get a 2N5109/2N5943 type of transistor. Amplify
We have a bunch of sweepers at work, and many of the them have
died and can't be fixed. The only way they can be repaired is
to cannibalize one to fix another, assuming they don't have
the same bad module. We have given away an 8510 to a school
and have others gathering dust.
Rick
jimlux
Samuel DEMEULEMEESTER wrote:
Right now, the performance is really good up to 3.5 GHz :
50 MHz : -7 dB
100 MHZ : -15 dB
250 MHz : -26 dB
500 MHz : -30 dB
1 GHZ : -32 dB
2 GHz : -32 dB
3 GHz : -30 dB
The real deal on the performance of prescalers is the ability to count
noisy sources. If
Hal Murray wrote:
Several years ago, I found a web site for a commercial place that made them
for museums. (I forget why I was looking for that sort of stuff.) You might
find interesting stuff/ideas via google but I didn't find a similar site with
a bit of searching.
The Museum of
ulm...@vaxman.de wrote:
blinked. This problem was eventually solved by driving the LED with a discrete
transistor instead of a free 74AC14 gate and decoupling this driver with an
RC-combination.
CMOS logic gates have a totem pole output that is famous for overlap
where both transistors on
A couple of disclaimers here:
1. Leeson's oscillator model was mentioned. That
doesn't apply much to crystal oscillators. The close
in noise will be limited by the intrinsic noise of
the crystal and the far out noise will be limited by
the buffer amplifier. Leeson's model never comes
into
On 9/30/2010 12:43 PM, Alan Melia wrote:
Mark to my inexpert eye that doesnt look like a very good overtone
oscillator but I appreciate that it is slimmed down to keep the weight and
size down, I can see why it is touchy. There is nothing to make the
oscillator degenerate at the crystal
Regardless of isolated anecdotal data on one oscillator, it
is probably not advisable to change the set point. The majority
of 10811 crystals do NOT have a turnover, only a region of
low tempco around 82 degrees.
Instead of that, change the circuit to B-mode and optimize
the heat between the two
On 10/12/2010 8:11 AM, gsteinb...@aol.com wrote:
Just a quick note...
HP was quite proud that scales for their precision meters were individually
produced
for each movement on a custom made servo controlled photographic calibrator.
An archive might be nice but won't provide the
I think you should probably be fine at 18V. The oven will run down
to at least 15V and maybe 12V.
Rick Karlquist N6RK
On 10/19/2010 5:27 AM, ewkeh...@aol.com wrote:
I plan on replacing the Xtal Osc. of my HP 5062C with a HP 10811 since I
have a few ones with AV less than 1E-12 from 1 to 100
Well, the good news is (if you buy one of these) is that the worst
that can happen is that you unwrap all that 2nd oven junk and
you are left with a 10811 for $50. I remember when they were
designing that double oven 10811. There are so many things
wrong with the design that I wouldn't know
Didier Juges wrote:
The designers of the HP E1938 (which never went to full production) went
through pains to try and keep the gradient evenly distributed precisely for
that reason. My guess is that it you take the cover out from the E1938, you
will find a perfectly symmetrical layout
Moderate humidity changes caused frequency shifts on the
order of parts in 10^9. With the environmental chamber
on full throttle, I saw parts in 10^8.
The E1938A has an unmeasurable humidity coefficient, even
unsealed.
Rick Karlquist N6RK
Jim Lux wrote:
Some mention has been made recently of
John Miles wrote:
Modern ECL parts aren't necessarily that bad compared to the old MECL
stuff.
My experience goes all the way back to the MECL 1000 series that was
discontinued 30 years ago. I designed many synthesizers around them
for Zeta Labs. Every newer family of ECL line receivers
I would like to add some perspective to this discussion.
The 10811 oscillator simply uses a plain vanilla Pierce
circuit configured so that one terminal of the crystal
is at ground. The base emitter capacitor is replaced
by a mode suppression network to force operation to the
correct overtone and
wje wrote:
Fluke.l (China) was selling a number of 1938's on Ebay. I snagged one
just to have a piece of HP history.
It works just fine, but I've noticed something a little strange.
Comparing the 1938 to both my cesium and GPS standards, there's a
distinct periodic 1ns phase shift every
J. L. Trantham wrote:
I, too, snagged one of these since it has the reputation of being the
ultimate achievement of crystal oscillator technology with the goal of
Thanks, we thought it was pretty good :-)
Toward that end, since it takes a few minutes for the 1938 to 'lock', is
there a
J. L. Trantham wrote:
Thanks for the info.
My plan is to develop a stable GPS disciplined reference suitable for use as
a reference for Microwave work in the 10 GHz range that can be used in
portable locations with relatively quick start up.
Perhaps the 1938 would be better in the shop
Bruce Griffiths wrote:
Some ECL devices have jitter specs in the 100 to 200fsec range.
see:
http://www.onsemi.com
This is misleading. While it is true that they have this
low jitter at multi-Gb/s rates, the jitter is much greater
than this at lower clock rates. At 10 MHz, ECL devices
Mark Sims wrote:
I have done quite a bit of work replacing fans in old equipment with modern
fans.
I have never seen a case where replacing a hurricane level fan with a
whisper
quiet fan made any real difference in the cooling inside the unit...
typically
one sees less than +/- 5C
Jim Flanagan wrote:
after warmup, I need to tweak the temp for a freq MIN. Whereas, for an SC
cut xtal osc we would be looking for a freq MAX. For both xtal cuts the
turning
point is typically set for somewhere in the 75 - 85 C range. I see
Jim
jf...@tampabay.rr.com
The majority of
An interesting technique used many places including HP is to have
a radio receiver connected to a pickup coil in the vicinity of
the grinding machine. The vibrations of the abrasive wheel
cause pings in the receiver at the resonant frequency. It
doesn't seem like this would work, but it
1. Is the 200 Hz drift measured at 660 kHz or at the final frequency,
perhaps 1.8 MHz? Even in the latter case, we are talking about 100 ppm.
2. Was the rig stable before and something changed? You didn't say.
3. Have you verified that the drift is not simply due to the crystal
itself? A
On 6/30/2013 8:47 AM, Attila Kinali wrote:
Most of the oscillator circuits out there place a small, but constant
DC voltage on the crystal, which has the same effect on the ions as
FWIW, the HP 10811 definitely does not do this (according to its
designers) since the crystal is capacitively
I'm looking for information about mounting (packaging) quartz
crystals with conductive epoxy such as:
1. Recommended type of epoxy.
2. Curing time and temperature.
3. Surface preparation of the gold.
4. Experts/consultants in this area you could recommend.
(Note: this refers to mounting
I have an 18 GHz HP 5342A frequency counter, which I don't seem to see
a lot, as members of my radio club borrow it. But it has no oven.
There is an option for an oven, but my model does not have the
optional oven fitted. I don't know if it would take a 10811A - if so I
might fit one, since I
Thanks for the info. I wouldn't have suspected those
little gain blocks were so good, and the voltage
bias problem makes sense.
Rick
On 9/30/2013 5:53 AM, Garry Thorp wrote:
Mini-Circuits' GALI- series of InGaP MMICs work pretty well. They typically
have ~4dB NF, and the noise performance
We have two sources and we want to be able to measure their
frequencies at the same time. We want to get a time record
of frequency each second. Apparently, what is meant
by a two channel frequency counter is that you get the
frequency of either channel A or channel B but not both
at once.
On 11/1/2013 7:12 PM, Tom Knox wrote:
A while ago I mentioned 5MHz oscillators were used in most metrology
applications compared to the more commonly available 10MHz because 5MHz was a
sweet spot for quartz. At the time I didn't know why. I finally had a chance to
ask the person I learned
On 11/1/2013 8:28 PM, Bob Camp wrote:
HI
If you doubled the diameter of the blank each time you cut the frequency in
half, all sorts of nice things might happen. If you start with a 1/2” blank in
at 10 MHz that goes to 1” at 5 MHz and 2” at 2.5 MHz. Around 1 MHz you would
get to a 5”
In a free running (non crystal controlled) oscillator,
the oscillator with the highest Q (regardless of frequency)
will have the best phase noise, if all oscillators are
normallized to the same frequency by ideal multiplication.
So the Q gain doesn't go away in that sense.
Having said that, in
On 12/30/2013 9:37 AM, Gerhard Hoffmann wrote:
Driving the DDS system clock from an expensive RF generator (e.g. HP
8648A)
would be possible but I'd prefer a PLL from 10MHz if it's doable
simply/cheaply.
Although expensive from a hobbyist viewpoint, the HP8648A is
far from HP/Agilent's best,
FYI:
http://www.hp4815a.com/
This guy did great work for me
in 1995. Seems to know everything
about this instrument. Had no idea
he was still in business.
Rick Karlquist N6RK
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On 1/13/2014 7:36 PM, Rex wrote:
This document lists that part number...
http://www.leapsecond.com/museum/10811a/90027-1.pdf
It says (I think -- in a quick scan) that it is mostly the same specs as
a 10811 D/E except a narrower EFC tuning range.
When HP was doing the smart clocks circa 1997,
On 1/28/2014 10:26 AM, cdel...@juno.com wrote:
Hi,
Does anyone know where to find the primary inductance value for Mini
Circuits RF Transformers?
I need to know so I can pick one to resonate with a particular capacitor
at 5Mhz.
At 5 MHz, the core is probably more resistive than inductive
Can anyone direct me to an amplifier with:
1. High reverse isolation
(over 40 dB). Note: the spec of interest
is *reverse* isolation, not port to port
isolation in a distribution amplifier.
2. Low phase noise
(less than -100 dBc/Hz at 1 Hz offset)
3. Works at 200 MHz
The Q-Bit QBH-1401PM
On 1/30/2014 12:30 AM, John Miles wrote:
Depending on how much forward gain you're after, I'd suggest looking at the
LMH6702 current feedback opamp. I keep a few of them around in Hammond
boxes, powered by NiMH rechargeables. Measured S12 is about 70 dB at 100
MHz, and I'm sure it could do
On 1/30/2014 7:50 PM, John Miles wrote:
Exactly, for unity gain you'd design for +6 dB and series-terminate the
output with 50R. Good for capacitive loads as well as isolation.
Do you run it in inverting or non-inverting configuration?
I've only used the non-inverting configuration
On 2/5/2014 9:37 AM, Bill Hawkins wrote:
Then there is the load side, with who knows what equipment making large
swings.
This reminds me of the time I visited the John Deere
foundry in Waterloo, IA. They had an arc furnace with
graphite rods the size of small utility poles. I
remember
It may be true that WWVB is sending out a new
format, but the receivers for it don't seem to
exist. The exclusive rights are held by this
company, which is clearly on hold while it
tries to find a customer who will pay for a
wafer run:
http://eversetclocks.com/
I've seen this sort of thing
Can anyone recommend a atomic wall clock
that displays in digital 24 hour UTC? Looking for largest
possible digits and LED preferred over LCD, under $100.
Any brands to avoid?
Rick
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Thanks for the suggestions, but the MFJ121 does not
display the date and the Lacrosse 8055 and 8016
do not display seconds. I need hour minutes seconds
day and date. You wouldn't think that would be
so hard. It looks like my only choice is this
smallish wall clock (more like a desk clock):
On 2/19/2014 6:35 PM, Chris Albertson wrote:
On Wed, Feb 19, 2014 at 3:52 PM, Richard (Rick) Karlquist
rich...@karlquist.com wrote:
Can anyone recommend a atomic wall clock
that displays in digital 24 hour UTC?
Any reason why it was to by WWVB? What if it used some other means of
saying
CORRECTION:
The 8005 series (with indoor temperature) does not support GMT
Only the 8115 and 8119 series (with indoor and outdoor
temperature) support GMT.
On 2/19/2014 5:47 PM, Richard (Rick) Karlquist wrote:
so hard. It looks like my only choice is this
smallish wall clock (more like
On 2/19/2014 9:10 PM, John Marvin wrote:
I guess my question is who has the right to grant exclusive rights for
the ability to decode a very simple protocol? Was a patent actually
granted for this?
John
They have exclusive rights to the IP core for their IC.
I guess someone else could
A fast comparator seems like a good idea, and it
is simple, however it is actually the last thing
you want to use. High thermal sensitivity and high jitter.
Rick
On 7/19/2012 1:35 PM, Dan Kemppainen wrote:
Or use a fast comparator such as an ADCMP600 series. Much lower delays,
and faster
On 7/22/2012 2:41 PM, Bob Camp wrote:
Hi
The feedback inverter is indeed a problem with fast logic, just bias it to mid
point off the supply instead.
1. Do not use CMOS inverters. Even though so much has been published on
using these in linear mode by
adding a feedback resistor, they
On 8/27/2012 11:45 PM, WB6BNQ wrote:
A microprocessor controlled XO is a non oven crystal oscillator system that has
additional computational control providing a bit more than just mere passive
temperature compensation. The additional computational capability deals with
having coefficients
The SC cut crystal is generally credited to Jack Kusters
(of HP) and Errol Ernisse. The story was something like
Errol proposed the concept and Jack actually made the
first one, which was quite non-trivial.
Jack used to joke that SC stood for Santa
Clara. (Jack and I worked for the old HP Santa
, and I have attended many FCS's. I
don't know how you prove to the Wiki police that
there is no paper predating EerNisse's paper.
Maybe there is a patent on it.
On 9/11/2012 2:22 PM, jim s wrote:
On 9/11/2012 10:01 AM, Richard (Rick) Karlquist wrote:
The SC cut crystal is generally credited
On 9/16/2012 12:03 PM, Gerhard Hoffmann wrote:
Am 20.07.2012 00:57, schrieb Richard (Rick) Karlquist:
A fast comparator seems like a good idea, and it
is simple, however it is actually the last thing
you want to use. High thermal sensitivity and high jitter.
Rick
On 7/19/2012 1:35 PM, Dan
The E1938A uses a crystal that is basically the same as
the 10811 crystal except that it is in a reduced height
package. However the phase noise is not as good as a
10811 due to broadband noise in the automatic frequency
control circuit. By the time I discovered this, it
was too late to try to
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