They will not be using a null steering antenna because of ITAR but IF
notching is still a possibility. I suspect the easiest change is to
use a superhetrodyne design so that all of the out of band rejection
does not depend on the RF filter but it will cost the power and space
of the local oscillat
James Burke did a whole episode of Connections on that subject:
https://www.youtube.com/playlist?list=PL777ACC303F62C744
The oldest example of an automated phase locked loop I have heard of
was used for calibrating newly built pendulum clocks to a master
pendulum clock.
On Wed, 9 May 2012 17:45:
Not being able to receive signals from GPS satellites anywhere below
the horizon is an even larger problem for vertical accuracy.
On Thu, 10 May 2012 13:59:51 +0100, "Rob Kimberley"
wrote:
>How accurate do you need your height?
>
>Remember that height is the least accurate of GPS parameters due
On Tue, 15 May 2012 16:43:50 -0700, "Rick Karlquist"
wrote:
>saidj...@aol.com wrote:
>> Yes, but the point is to not use end-termination for all the reasons
>> mentioned by others in this thread, such as massive spike in power
>> consumption
>> once per second, over-voltage spikes if the terminat
B&B sent me an email today advertising optically isolated USB to
serial but the price awfully high for personal use:
http://www.bb-elec.com/product_multi_family.asp?MultiFamilyId=133&Trail=45&TrailType=Main
I have yet to be happy with any USB to serial conversion in legacy
applications. They alw
Switched bridge or sensor excitation is an old technique used to gain
greater sensitivity for a given power without undue power dissipation
in the sensor itself. The later can be important to prevent self
heating in a temperature sensor.
I suspect you could get most if not all of the benefit by u
On Tue, 21 Aug 2012 10:50:43 -0600, wrote:
>Hello everyone,
>
>I am new to this forum.
>It looks like a lively discussion on various topics.
>
>A colleague of mine here at Agilent pointed me to this paper entitled "The
>Design of Low Jitter Hard Limiters" by Oliver Collins. In Bruce Griffith
Do you mean with a 7404 hex inverter? I actually did something like
this recently while adding a 75ns pre-trigger pulse to an existing
fast rise pulse generator.
The pre-trigger pulse ended up having significant pattern dependant
jitter caused by the adjacent TTL divider chain modulating the supp
can be useful
>for the jitter analysis. Maybe a stable timebase and low jitter external
>trigger input are essential. Unfortunately the TDS3012 has a 200ppm
>timebase...
>
>On Wed, Aug 22, 2012 at 2:54 PM, David wrote:
>
>> Do you mean with a 7404 hex inverter? I actually d
On Wed, 22 Aug 2012 19:00:10 -0700, Hal Murray
wrote:
>jmulc...@cox.net said:
>> The amount of jitter verses logic family is all over the place as well. Take
>> a look at an LS verses an HCT vs an S family and you will see what I mean.
>> Some of them are very nasty, and are not all created equal
On Mon, 03 Sep 2012 12:00:53 -0500, Graham / KE9H
wrote:
>On 9/1/2012 1:35 AM, Hal Murray wrote:
>> The context is using the 60 Hz line for timing.
>>
>> I'm feeding 60 Hz from a wall wart transformer into a modem control signal
>> that the kernel PPS stuff watches. Mostly, it works as expected,
It is even more difficult when the schematic is wrong like in figure 1
where the emitter and collector of the PNP are reversed.
On Wed, 5 Sep 2012 16:26:04 -0600, Tom Knox
wrote:
>
>Hi Bob;
>There are many designs I have seen employed at NIST that have low phase noise
>and low noise floor. But
On Wed, 12 Sep 2012 00:42:48 +0200, "Peter Krengel"
wrote:
>I'm looking for a possibility to make an automatic switching
>between the internal µC oscillator (Atmel µC) to the 10MHz output
>of my thunderbolt to use it as a precise µC clock. Has anybody an idea how
>to do best without disturbing t
On Fri, 14 Sep 2012 15:08:53 -0700, Hal Murray
wrote:
>d...@montana.com said:
>> Michael: Actually implementing a 16 bit DAC to its 1-bit minimum resolution
>> will be headache enough. You will gain a real education in good grounding
>> practice, shielding, power supply stability and noise, and o
The pulse per second output on the Garmin serial/CMOS interface units
is only specified to be within 1 microsecond. I guess they are
commonly used to synchronize NTP servers where any extra precision
would be lost in network transport anyway.
I have been thinking of picking one up cheap to test s
On Thu, 27 Sep 2012 18:59:48 -0400, Jeff Stevens
wrote:
>On Thu, Sep 27, 2012 at 1:27 PM, Hal Murray wrote:
>> What do hams do in that environment?
>
>Hams either avoid HOAs and deed restricted property or they live with
>the restrictions by placing their antennas in attics and other
>inconspicu
e:
>Hi
>
>The gotcha isn't the neighbors (who you can negotiate with) it's what ever
>entity enforces the title restrictions. With the recent dip in sales, that may
>be the original developer, still there a decade later
.
>
>Bob
>
>On Sep 27, 2012, at 7:30
I have been thinking about this problem on and off over the last
couple of days.
Would it be better to take the absolute value rather than squaring the
signal?
I might try some tricky but impractical analog sampling and/or
synchronous demodulation recovery method but the Costas loop looks
awfully
Offhand I can not think of any reason it could not exist but if you
have to ask for the price, then I suspect it will be too expensive.
On Sun, 30 Sep 2012 19:40:47 -0700, Skip Withrow
wrote:
>Hello Nuts,
>
>Just saw this mentioned in Circuit Cellar, just wonding if it really
>exists, how much t
Is there a list of GPS timing receivers that provide the sawtooth
correction message or implement sawtooth correction internally?
I assume there is a design compromise that prevents economically phase
locking the GPS receiver clock to the GPS signal to remove that
contribution to timing error.
On
-Original Message-
>From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
>Behalf Of David
>Sent: Tuesday, October 02, 2012 1:04 PM
>To: Tom Van Baak; Discussion of precise time and frequency measurement
>Subject: Re: [time-nuts] Best counter setting for
can use it rather than change the GPS
receiver hardware.
On Tue, 2 Oct 2012 12:57:15 -0700, "Tom Van Baak"
wrote:
>Mark,
>
>All GPSDO "remove that contribution to timing error" by virtue of the quartz
>"fly-wheel".
>I think David was asking about GPS
On Tue, 02 Oct 2012 23:01:45 +0200, Magnus Danielson
wrote:
>On 10/02/2012 10:43 PM, J. Forster wrote:
>> Take a look at the specs of this unit:
>>
>> http://www.mobilephonejammer.com.au/covert-gps-jammer-portable-p-119.html
>>
>> The Power Output is 0.5 Watts and it claims a jamming range of 1-1
. Disabling the low power CPU state
fixed it until a BIOS update was released.
It has been a while but as I recall, the NTP client kept the OS from
drifting further behind but the time was still noticeably off.
On Fri, 5 Oct 2012 00:42:42 -0400, Bob Bownes
wrote:
>David,
>
>The proble
What aspects of USB would HP have used? Just the complexity of a USB
OHCI/UHCI would have been economically prohibitive compared to an
asynchronous serial UART. An OHCI/UHCI is more like an ethernet
controller and those took up the space of entire expansion boards
initially.
What they did come
Ah well, I missed it but only because I have seen other people make
the same suggestion seriously in the recent past.
Where is my box of 2102 DRAMs? I left it around here somewhere.
On Wed, 10 Oct 2012 11:15:32 -0400, paul swed
wrote:
>David it was humor
>Regards
>
>On Wed, Oct 10
tting here coding it into a new product right now (once
>the uber super compiler finishes a build). It's supported on just about
>every chip set in the universe. I suspect it will outlive the cockroaches.
>
>Bob
>
>-Original Message-
>From: time-nuts-boun...@febo.com [m
On Fri, 26 Oct 2012 12:53:02 -0500, Dennis Ferguson
wrote:
>> Also, some antennas are better at rejecting low angle signals than others.
>> While the software can reject some undesired signals, it can only do so if
>> the software can identify them as separate. If the multipath signal
>> destr
_E8-X.
pdf
This appears to use a DDS/PLL to clean the reference clock rather than a
large and expensive OCXO.
Starting afresh I may have gone for the CW25 but I've got the CW12 so not
thought much more about it.
Regards
David Mackenzie (GM4HJQ)
__
ted to you, I suspect they have been
off the market for years.
At the moment the OCXO is happily locking down and vastly cleaner than the
CW25 output, given time I want to modify my 60kHz (MSF) time signal receiver
before I review the PLL in the GPS.
Regards
David
_
I fear are best read with care alongside some other histories to maintain
balance.
Regards
David
> -Original Message-
> Hej Magnus
>
> A capacitive sensing AC bridge can be very sensitive, one only has to
> look at the work of RV Jones at the university of Glasgow in
> I don't know a whole bunch about microwave gear, so I need a
> little help. I came across a small box in a pile this
> evening and I don't have a clue what it is.
>
> It's a T construct, with SMAs at both ends of the horizontal.
> The vertical end looks like it's terminated to gnd.
> Int
a very brief play with the 'faulty' ones and things seemed to
work after the fault message was acknowledged, I could not see any symptoms
other than the self test error message. A nice counter but I'm getting ever
more nervous about the ability of current test equipment to survive
I'm getting slightly suspicious about the assumptions as to what was
available 2000 years ago, the remarkable Antikythera Mechanism points to
some technologies of 2000 years ago being almost up to medieval European
standards. Clearly Antikythera indicates there were a few stunning items
around, the
ommend that if you can
store an image of the eproms when you have it open, I've seen quite a few
reporting eprom errors on power up so I'm running on copies with the
originals and their images in storage
Regards
David
GM4HJQ
___
time-nuts m
want the image files I
generated of good parts emailed, the set of images etc in various formats is
about 1.7M (4 parts in 3 different file formats).
David
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cg
opies of the flash data
sheet.
Regards
David
___
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and follow the instructions there.
blame next time. Besides, £25 for a mains
filter is painful when the whole meter cost £20 via fleabay - it's one of
those Scottish things.
David
GM4HJQ
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and follow the instructions there.
>From the BBC:
"A pub clock dating back to the introduction of a tax on timepieces more
than 200 years ago has sold at auction for £8,800.
The George III Act of Parliament clock, decorated with hunting scenes, was
made around 1797 and was once on the wall of a tavern.
It was discovered in a hous
ly sync the watch to
your GPS / Rubidium / Caesium / Maser standards and calibrate the watch
drift (including temp effects) etc. It might be a bit of a trick to get Lady
Heather to run on it.
Links:
www.ti.com/ez430
www.ti.com/chronoswiki
David
_
> Other Timeballs that I know are
Another for the list, some of you will have visited Edinburgh which has
run a time gun and ball since the 1860s. I'll spare you the usual links,
the foot of this link shows the time gun correction maps that the
Edinburgh time nut of the 1860s would would
I've not seen it mentioned but VLF time stations are on topic here. I
saw that the Mount Ootakadoya VLF (40kHz) transmitter in Fukushima
prefecture is off air :
"Time Signal. 50kW. Transmission is stopped since 10h46 UT on March 12,
2011 because of the evacuation of the area around the Fukush
I've got one of the cheap radio-controlled clocks? I was listing to
radio 4 the other day and herd the time signal. The radio controlled
clock was about 3 seconds off. I was a bit surprised it was so far
off. I'm just wondering how accurate these things are.
David,
Be aware that if
This might amuse,
"LightSquared promises to replace satellite push-to-talk kit"
http://www.theregister.co.uk/2011/07/27/lightsquared_ptt/
--
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What kind of performance would you expect in this application? Low
jitter? 50 ohm output? TTL or better signal levels? Fast rise and
fall times? Duty cycle correction?
After reading your post I was thinking about how to go about it and
ended up with an 8 transistor discrete design using a dif
There is no reason you can not do that.
It is tricky because the low comparison frequency limits the loop
bandwidth like any sampled data system and the analog requirements for
the low frequency design become an issue do to leakage and the
impedance levels needed. The long time constants involved
Did you test the LTC1655 INL? The data sheet says plus or minus 20
counts maximum.
I suspect Linear Technology designed those low DNL high INL parts for
just this sort of application where only monotonic behavior really
matters. Their equivalent current output DAC costs about twice as
much not i
I agree that they are an amazing value but what kind of operating
lifetime do the Rb tubes have? SRS has this to say:
>Historically, the lifetime of rubidium frequency standards has been
>dominated by rubidium depletion in the discharge lamp. To avoid excess
>flicker noise, manufacturers would lo
On Sat, 31 Dec 2011 17:56:46 -0800, Hal Murray
wrote:
>This looks like fun to me, but I like writing that sort of code. Note that
>it doesn't need an OS or even any libraries.
Both designs look fun to me but for different reasons. The analog
design requires attention to leakage and noise whil
Jim Williams did this in one of his designs for measuring low
frequency reference noise. The large value low leakage wet tantalum
capacitor he used was like $400 and it took 24 hours for the
dielectric absorption to settle:
http://www.linear.com/docs/28585
You can get the necessary time constant
(MST), "Don Latham"
wrote:
>Aren't there op-amp circuits that create a large capacitance? The gyrator?
>Don
>
>David
>> Jim Williams did this in one of his designs for measuring low
>> frequency reference noise. The large value low leakage wet tantalum
&g
I think even my old Icom 706 would work that way. It has the high
stability option installed. From what I remember from the service
manual, every mixer has its local oscillator frequency locked to the
master oscillator through either a PLL or DDS which makes passband
shifting via the IF frequenci
e. An interferometer, using an analogy to optics, would be mixing
>the received spectrum prior to any detection.
I would say it is still an interferometer. It relies on measuring
coherent phase information.
>The AR-One-C is set up for this type of DFing.
>> http://www.aorusa.com/
On Sun, 01 Jan 2012 18:30:24 -0800, Hal Murray
wrote:
>A while ago, Rigol dropped the price of their 100 MHz 2 channel scope to be
>the same as their 50 MHz version. That was low enough for me. Since then,
>they dropped the 50 MHz version to $330.
> http://www.rigolna.com/products/digital-os
On Mon, 02 Jan 2012 06:20:36 +0100, Magnus Danielson
wrote:
>On 01/02/2012 06:09 AM, David I. Emery wrote:
>> On Sun, Jan 01, 2012 at 05:54:46PM -0800, J. Forster wrote:
>>> To me the ball drop/fireworks was different from the on-screen time on FOX
>>> by a few secnds
This sounds like a perfect application for applying antenna wax to
coaxial cable.
On Sun, 1 Jan 2012 22:33:00 -0700 (GMT-07:00), "Richard W. Solomon"
wrote:
>You can't even get two TV's in the same house in sync with Dish Network !!
>
>The smaller TV in the kitchen gets the feed about a second
he holy grail and it is questionable if a discrete
>> design is way better than one of the chips.
>>
>>
>> Here is another limiter circuit (by Chris Trask):
>> http://ehydra.dyndns.info/NG/LTspice/Negative%20Impedance%20LO%20Driver.pdf
>>
>>
>> - H
esign is way better than one of the chips.
>
>
>Here is another limiter circuit (by Chris Trask):
>http://ehydra.dyndns.info/NG/LTspice/Negative%20Impedance%20LO%20Driver.pdf
>
>
>- Henry
>
>
>David schrieb:
>> What kind of performance would you expect in this appl
On Mon, 02 Jan 2012 17:14:37 -0800, Hal Murray
wrote:
>
>> Time constant is just R*C. If you have a 1000uF cap and a 1K resistor you
>> have 1 second. In theory you could build 100s just by using a 100K resistor
>> but I think real world components are not perfect enough.
>
>Does anybody know
On Tue, 03 Jan 2012 07:01:13 +0100, ehydra wrote:
>David schrieb:
>> I could analyze it on SPICE but I suspect the real world construction
>> parasitics will be what limits the performance. I just sketched it
>> out in my notebook but I will see if I can post it somewhere.
On Wed, 04 Jan 2012 00:58:24 -0800, Hal Murray
wrote:
>With a XOR, you can't tell which input is higher frequency. I think you can
>fix that with a second XOR and a delay line.
>
>I think 90 degrees of delay will provide the most information. At 10 MHz,
>that's 25 ns. I think that's about 15
On Thu, 05 Jan 2012 01:44:13 -0800, Hal Murray
wrote:
>albertson.ch...@gmail.com said:
>>
>> Have an older Tek 465 scope that is in only "fair" shape and I see nothing
>> on that pin but milivolt level sine wave of about 60MHz. I can't set the
>> scope to show any hint of a PPS ...
>
>I do have
On Thu, 05 Jan 2012 18:54:31 +0100, EB4APL
wrote:
>On 05/01/2012 16:49, David wrote:
>> On Thu, 05 Jan 2012 01:44:13 -0800, Hal Murray
>> wrote:
>>
>>> albertson.ch...@gmail.com said:
>>>> Have an older Tek 465 scope that is in only "fair" s
al amplifier, so I can
>> apply a 20MHz low pass filter and about 20X voltage gain.
>>
>> The documentation I have says pin 6 is "N/C" but it looks like there is a
>> way to extract a usable PPS but I think I'm going to need and LC filter,
>> some op amps a
Doh!
Hopefully anything directly connected to that 5 volt supply pin can be
replaced if neccessary.
On Thu, 05 Jan 2012 20:37:06 +0100, EB4APL
wrote:
>I found it, I used the +15 V of my triple output supply to power the
>pin 4, +5 V input. A 75ACT240 popped up and who knows the health of the
On Fri, 06 Jan 2012 17:47:47 +0100, mike cook
wrote:
>Le 06/01/2012 17:02, Chuck Forsberg WA7KGX N2469R a écrit :
>> The Tech Manual does not call for heat sinking (unless I missed
>> something).
>> The top has labels over much of the surface.
>> The bottom has a plastic sheet between the circui
I just did this search for similar application. The cheapest stuff
they have is expanded polystyrene bead sheet which is easy enough to
work with but may be too thick (3/4") or not as durable as you want. I
made a hot wire cutting element for my Weller soldering gun out of a
length of 10 gauge cop
I completely forgot about those two. I have a good local hobby shop
with large pieces of balsa wood but I suspect it would be more
expensive than good quality expanded polystyrene bead sheet. I will
have to check out foam board next time. Both would be more difficult
to cut without a hot wire kn
On Fri, 06 Jan 2012 16:33:19 -0500, John Ackermann N8UR
wrote:
>On 1/6/2012 4:14 PM, Rick Karlquist wrote:
>
>> Before making this into a science project, consider this data
>> point: We converted the oscillator in a 10811 to run in mode
>> B at 10.95 MHz. The tempco in mode B is about 30 ppm p
On Fri, 6 Jan 2012 19:08:18 -0500, Joe Gwinn
wrote:
>At 10:15 PM + 1/6/12, time-nuts-requ...@febo.com wrote:
>>Date: Fri, 06 Jan 2012 14:41:13 -0600
>>From: David
>>To: Discussion of precise time and frequency measurement
>>
>>Subject: Re: [tim
I have done the same thing with an amplified patch antenna facing out
the window.
I wonder in this case if making a rough 1/4 wave antenna out of a very
short feedline would be enough for a cheap outdoor sanity check.
On Sat, 7 Jan 2012 14:21:09 +, shali...@gmail.com wrote:
>I test all my GP
ust take care that GPS signal is right-hand circularly polarized. For
>those interested in building GPS antennae I recommend the QFH-type antenna:
>quite complex but it is the same antenna actually used to transmit from the
>birds.
>
>On Sat, Jan 7, 2012 at 5:02 PM, David wrote:
&g
The FD-5680A specifications say the output is a 0.5 V RMS sine wave
into 50 ohms so there are lots of options if that is the signal you
want to distribute.
There are a number of medium power operational amplifiers specified
for video applications which will operate at a gain of 2 allowing back
ter
pretty or high performance but it will be
cheap in money and time and may restore sanity.
On Sat, 7 Jan 2012 11:25:19 -0600, "Don Lewis"
wrote:
>How long a wire?
>-Original Message-
>From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
>Behalf Of
Most of the gear I have expects TTL levels or better. A 0.6 volt RMS
sine wave (1.2 volts peak to peak) could be a problem. As far as
ringing, I would design something with back termination and slew rate
limiting and expect the receiver to terminate to ground which is
almost always the situation.
On Sun, 8 Jan 2012 14:23:02 -0800, Orin Eman
wrote:
>On Sun, Jan 8, 2012 at 1:51 PM, Clint Turner wrote:
>
>> Hello,
>>
>> After posting a few days ago about one of my '5680A's having the voltage
>> converter installed - but not connected - I've done a bit of
>> reverse-engineering and sleuthing
On Mon, 09 Jan 2012 03:05:36 +0100, Magnus Danielson
wrote:
>On 12/31/2011 08:15 AM, Charles P. Steinmetz wrote:
>> I know the thread began with a request for a "simple" DIY GPSDO, and
>> this may not be quite as simple as some might like. However, PPS
>> discipline is generally the simplest and
On Tue, 10 Jan 2012 21:57:49 +1300, Bruce Griffiths
wrote:
>Hal Murray wrote:
>>
>> The TADD-3 uses 3 AC drivers in parallel, each going through a 51 ohm
>> resistor. Changing those resistors to 150 ohms should work. Maybe a bit
>> lower to account for the impedance in the drivers. I'd proba
On Wed, 11 Jan 2012 08:35:56 -0600, Bob Smither
wrote:
>Joseph Gray wrote:
>> I'm not seeing a PPS on either of these. All I see is about 17 mV P-P
>> of noise that looks like a multi-stepped sine wave. I'm using a TDS
>> 340 scope.
>
>I can see the 1 usec, 1pps on mine, but only if I use an anal
On Wed, 11 Jan 2012 08:37:02 -0800, Chris Albertson
wrote:
>On Tue, Jan 10, 2012 at 10:11 PM, Joseph Gray wrote:
>> I'm not seeing a PPS on either of these. All I see is about 17 mV P-P
>> of noise that looks like a multi-stepped sine wave. I'm using a TDS
>> 340 scope.
>>
>
>PPS is likely there
How would a GPSDRbO work? Phase lock the DDS output to the GPS? Phase
lock a VCXO to the GPS and then phase lock to the RbO on loss of GPS
lock?
On Wed, 11 Jan 2012 22:55:58 -0600, "J. L. Trantham"
wrote:
>Bill, Brian, Bill, and Peter,
>
>Thanks for the info. All I need now is a 'project' to i
On Wed, 11 Jan 2012 22:44:47 -0800, Hal Murray
wrote:
>> How would a GPSDRbO work?
>
>The same as if you were building a GPSDO using a quartz oscillator. Since
>the Rb has better long term stability, you can use a longer time constant on
>the filter.
But how do you adjust the RgO output frequ
that the RbO can be adjusted with an external
magnetic field.
On Thu, 12 Jan 2012 07:34:44 -0600, "J. L. Trantham"
wrote:
>David,
>
>I have been following discussions on the list about a GPSDRbO for a year or
>so. Some interesting challenges and probably best implemented in a
ut they all suffer from DDS and
>tuning noise. I see now that the RbO can be adjusted with an external
>magnetic field.
>
>On Thu, 12 Jan 2012 07:34:44 -0600, "J. L. Trantham"
>wrote:
>
>>David,
>>
>>I have been following discussions on the list
I would just use a PIC, AVR, or ARM even if I had to use more than one
with some discrete logic on the side but I like solder, assembly, and
low level coding in that order. If I find a small, cheap, easy to
use, and general purpose FPGA, I may look into that as well.
MIPS may be a special case fo
On Mon, 16 Jan 2012 12:48:24 -0500, michael taylor
wrote:
>On Mon, Jan 16, 2012 at 12:17 PM, John Lofgren wrote:
>> There have been discussions in the past about ways to reduce regulator
>> output noise or clean-up oscillator or voltage reference power supplies.
>> Here's an article from Desi
On Tue, 17 Jan 2012 10:46:19 +0100, "Anthony G. Atkielski"
wrote:
>> Has anyone come across a NTP client that uses native 64 Win 7 code? I've
>> noticed all the 64 bit versions are running under WOW. I've use Meinberg
>> now found another source out of Poland.
>
>Windows has long had its own buil
Oh great. Now everybody knows. :)
On Tue, 17 Jan 2012 15:43:24 -0500, Bob Bownes
wrote:
>if anyone is looking for a 5370, there is one on ebay that is currently
>listed for $29+shipping...
>
>http://www.ebay.com/itm/HP-Agilent-5370A-Universal-Time-Interval-Counter-/160714650831?pt=LH_DefaultDo
I layout the design I want (autocad) and print it reversed 1:1 on
overhead projector film. Then I cut and mount it printed side down
with 3M Super 77 spray adhesive. The mylar film is very tough and
resistant to solvents. I use an ink jet but a laser printer should
work as well.
A similar proce
On Sat, 21 Jan 2012 17:20:39 -0600, "Paul F. Sehorne"
wrote:
>On Wed, Jan 18, 2012 at 6:25 PM, Chris Albertson
>wrote:
What I bought is a 15V open frame supply from allelectronics.com for
$11.50. It turned out to be a very high quality power supply (Digikey
has the same unit for
The package is a TO-202 with the tab cut off or at least the MPS-U51
uses a TO-202 package. Be careful when you replace it because the
pinout is EBC which is deprecated in power transistor packages.
Ic = 2.0 A
Vceo = 30 V
Pd = 1 W @ Ta 25 C
hfe = 60 @ 0.1 A
Ft = 50 MHz min
This is a very non-cri
On Mon, 23 Jan 2012 17:27:32 -0500, "Charles P. Steinmetz"
wrote:
>Stan wrote:
>
>>The 5328A manual I have shows a 3.5 V supply (looks like it is used just
>>for the display). But with a bit lower Vce sat drops, I'd guess you
>>get around
>>1 V across the 10 ohm segment resistors. Or only abou
I think James Burke discussed these clocks in one of his documentary
series. Besides not using a pendulum, they were temperature
compensated by using materials with opposite temperature coefficients
of expansion and then gimbaled for use on a rolling and pitching ship.
Oddly enough, the phase loc
The sawtooth error in the PPS output and how they were able to correct
it externally was interesting. I have seen that kind of problem
before in DDS and other applications.
I wonder what other GPS receivers provide either PPS outputs without
sawtooth noise or a correction message.
On Sun, 29 Jan
On Wed, 1 Feb 2012 09:27:30 -0800, Chris Albertson
wrote:
>On Wed, Feb 1, 2012 at 8:19 AM, Attila Kinali wrote:
>> On Wed, 01 Feb 2012 09:07:23 -0500
>> John Ackermann N8UR wrote:
>>
>>> There've been numerous threads on the Gnuradio mailing list about code
>>> to receive GPS using the Ettus Re
Odd. Did Tektronix mark it Fluke PM3082? :)
It is nice to know that the current generation of digital cameras can
be used for this application. It is too bad that the image has so
much noise.
On Thu, 2 Feb 2012 16:27:03 +, John Howell
wrote:
>and here's another photo of the pulse
The probe compensation could be off.
What type of vertical plug-in was used? The Tektronix 11000 series of
oscilloscopes scare me.
On Sat, 04 Feb 2012 00:36:13 -0800, Rex wrote:
>Good image.
>
>So, if I read that right it is a pulse about 1 uS wide and goes from
>base of zero volts to about 5
On Tue, 7 Feb 2012 08:28:14 +0100, Attila Kinali
wrote:
>On Sun, 5 Feb 2012 19:55:36 -0900 (AKST)
>"Richard H McCorkle" wrote:
>
>>While using a faster timebase or higher interpolator gain increases
>> the resolution that doesn?t imply the accuracy will also increase. The
>> PICTIC II uses C
Step recovery diodes turn off fast but have a relatively long storage
time. The fastest switched current integrators use schottky diodes.
On Tue, 7 Feb 2012 14:06:55 +0100, Azelio Boriani
wrote:
>To enhance the PICTIC II performance can step recovery diodes be used?
>Maybe the fast turn off can
On Fri, 10 Feb 2012 16:35:26 -0800, Chris Albertson
wrote:
>On Fri, Feb 10, 2012 at 3:52 PM, Bob Camp wrote:
>> Hi
>>
>> I think you will need some sort of analog detector to get what you are
>> looking for.
>
>I don't think it needs to be analog. For example you can xor the two
>10MHz signal
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