I have a number of HP 10811 related documents on my Manual pages at
http://www.ko4bb.com/cgi-bin/manuals.pl
Search for '10811'
Didier KO4BB
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Roy Phillips
> Sent: Wednesday, May 28, 2008 4:35 AM
> To:
I found a cheap IR sensor (not a spot meter) useful to identify the one IC
that's warmer than the others in a fully populated PWB. That has been useful
to isolate the one bad part, but a contact thermometer would have been
almost as useful. While the IR sensor reading depends on emissivity, the
con
http://www.ko4bb.com/cgi-bin/manuals.pl?dir=HP_Agilent/HP_-_105
Didier KO4BB
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of J. L. Trantham
> Sent: Tuesday, May 27, 2008 10:20 PM
> To: time-nuts@febo.com
> Subject: [time-nuts] HP 105B
>
> I have
David,
It appears as if exiting the program caused the unit to revert to local
mode, and assume the position selected by the switches.
Interesting, I had forgotten about that. I need to check if it does the same
with my controllers.
Thanks and congrats,
Didier
> -Original Message-
>
Remember these units don't have uC, so any signal that would normally depend
on some timing must be generated externally, i.e. come from the bus. I
suspect the box might need some signals that other equipment (uC equipped)
may not absolutely require. However, this being a piece of HP equipment, I
a
David,
Yes, I have programmed both types of relay boxes (59306A and 59307A). I have
a couple of each here. As far as I recall (using a serial BlackBox GPIB
controller) there was nothing to it. These boxes don't even have a uC, they
just use TTL logic. How hard can it be :-) ?
I really do not reca
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Stanley Reynolds
> Sent: Thursday, May 22, 2008 9:37 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Comparing Reference Accuracy
>
>
>
> I have several HP
I started doing that some time ago using my Wiki, but got distracted. Anyone
can contribute, you are certainly welcome to:
http://www.ko4bb.com/cgi-bin/wiki/wiki.cgi
Didier KO4BB
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Robert Atkinson
> S
I have a Trimble Bullet, a Symmetricom HP 58532 and an inexpensive mag-mount
patch antenna. All are amplified. As far as how many sats they see, they are
roughly equivalent. Of course, the Bullet and HP units have narrow filters
and better defined capture range (to reject reflections from the sides
> Subject: ARLB010 Spring 2008 W1AW Frequency Measuring Test Set
> Date: Mon, 19 May 2008 13:33:09 -0400
> To: [EMAIL PROTECTED]
> CC: Subscribed ARRL Members:;
> From: "ARRL Web site" <[EMAIL PROTECTED]>
>
> SB QST @ ARL $ARLB010
> ARLB010 Spring 2008 W1AW Frequency Measuring Test Set
>
> ZCZC
Phil,
The T-E datasheet lists timing accuracy at +/-15nS (1 sigma), where did you
get the spec that says 20?
Also, the antenna connector on the T-E is a BNC, the old T has an F
connector.
Didier KO4BB
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf
Connector layout on the E version is different, so for sure it's a different
design. Also, the PPS acuracy is 15nS versus 20nS (1 sigma) for the older
model.
I have not looked farther than that in the spec.
Didier
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED
For NiCad and NiMH batteries, check www.allelectronics.com
They have some with tabs that are really inexpensive and work well. I have
rebuilt several ham radio battery packs with these batteries (I bought two
cases of 40 of the AAs with tabs, no problem).
Didier KO4BB
> -Original Message
John Ackermann N8UR <[EMAIL PROTECTED]> wrote:
> Didier Juges wrote:
>
> > While I applaud John for going through this for his non-paying customers, I
> > could not blame him if he simply gave up on that... Easy for me to say since
> > I don't use AOL :-
There are many reasons why a person might want to stay with a particular ISP
for mail. I don't but one of my friend does, and that has been a subject of
conversation between us in the past. While a fully qualified engineer, this
person wants to keep her AOL mail account for a number of reasons, whi
Have you checked the many 10811 documents on my web site?
http://www.ko4bb.com/cgi-bin/manuals.pl
Searchg for 10811
Didier KO4BB
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Roy Phillips
> Sent: Sunday, May 11, 2008 12:14 PM
> To: Discussion
I can see we now agree this was a silly discussion :-)
Didier KO4BB
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Mike S
> Sent: Sunday, May 11, 2008 5:43 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] H
Sounds good to me :-)
Thanks for a useful suggestion.
Didier
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Tom Van Baak
> Sent: Saturday, May 10, 2008 9:49 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts]
This is exactly why I should not have started that thread.
But since I started this, I have to finish it.
I confused you with specification requirement and acceptance requirement.
Here is where this came from:
In our business (custom military hardware), we receive a specification from
the custome
age-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Mike S
> Sent: Saturday, May 10, 2008 12:36 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] HP 5370B
>
> At 10:43 AM 5/10/2008, Didier Juges wrote...
> (correcte
y, May 10, 2008 9:19 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] HP 5370B
>
> At 09:22 AM 5/10/2008, Didier Juges wrote...
> >Most microwave network analyzers have amplitude resolution
> of 0.01dB,
> >while their accuracy is
] HP 5370B
>
> At 09:22 AM 5/10/2008, Didier Juges wrote...
> >Most microwave network analyzers have amplitude resolution
> of 0.01dB,
> >while their accuracy is just around 1dB in most cases.
> >
> >I have had to argue too many times that a piece of equipment
&g
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Didier Juges
> Sent: Saturday, May 10, 2008 8:08 AM
> To: Time-Nuts
> Subject: Re: [time-nuts] HP 5370B
>
>
> That's a good illustration of the difference between
&g
> -Original Message-
> From: Magnus Danielson [mailto:[EMAIL PROTECTED]
> Sent: Saturday, May 10, 2008 5:09 AM
> To: time-nuts@febo.com; [EMAIL PROTECTED]
> Subject: Re: [time-nuts] HP 5370B
>
> From: "Didier Juges" <[EMAIL PROTECTED]>
> Subject:
Mark,
The 5335 is specified at 9 digits/second of resolution, the 5370 is
specified at 12 digits/second.
That's 3 orders of magnitude better resolution. That brings up noise that at
9d/s is simply negligible.
My two 5370s are rock stable if I only look at the 9 left-most digits.
While it would
Martyn,
I have written a VB program to do that. There are plots on my web site.
Send me the first few hundred lines of your data with some explanations
about what the fields are and I'll see what I can do with it.
Didier
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Bruce Griffiths
> Sent: Monday, May 05, 2008 8:12 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Fast frequency counting question
>
Great news Tom and John.
Thanks for taking the time on behalf of so many others.
Anxiously waiting for more news,
Didier KO4BB
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Tom Van Baak
> Sent: Monday, May 05, 2008 4:55 AM
> To: Discussion of
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Bruce Griffiths
> Sent: Sunday, May 04, 2008 7:27 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Fast frequency counting question
>
> John Miles wrote:
> >
Very interesting, that's a lot of hardware for $179. If that thing is still
around by Christmas, that will make for a nice Christmas present...
Didier KO4BB
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of christopher hoover
> Sent: Sunday, May 04,
Here are my 2 favorite power supplies.
http://www.ko4bb.com/Test_Equipment/Power_Supplies.png
The one on the left is a 30V/3A supply. The current limit is adjustable with
a 10 turns pot, so it can be precisely set. I only use 3 turns of the 10
turns pot, so that one turn is one A, resolution is
Well, I am not sure I can tell much about how modern repeater power supplies
are made because I do not believe the spec I got is public domain, but I can
tell you it's a little more elaborate than a power resistor in series with a
shunt regulator, unfortunately.
They are apparently running more th
Interestingly, my company just received an RFQ for DC/DC converters for
trans-oceanic cables. Interesting specification. Among other things,
2,000,000 hours MTBF (the converters are multi-redundant) and, I like that
part, 100% altitude tested :-)
Something else you might find interesting: all repe
t looks like the electrolytics
> are all NIC or Panasonic, not a no-name cap.
> Still, I've seen my share of balky electrolytics. I was just
> hoping someone had fixed this particular problem before and
> could point to a likely component to try first.
>
> Scott
>
It is not clear from your post if you did that test while under power or
not.
This is probably a Rotary Optical Encoder. It may need 5V to power the LEDs
or light bulb that activate opto-sensors, so you probably need power applied
and use a scope to check the outputs. Also, some devices only gener
Then for good measure, read this one:
http://www.ko4bb.com/Manuals/5)_GPS_Timing/John_Vig_Quartz_Crystal_Oscillato
r_Tutorial.pdf
Didier
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of John Miles
> Sent: Monday, April 28, 2008 1:15 AM
> To: Discu
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Bruce Griffiths
> Sent: Saturday, April 26, 2008 8:51 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] RS485/422/232 Chip
>
>
> Any idea of the jitter of the An
I am using the LTC1535 in an application right now, and if you need RS-485,
it is pretty neat. It includes the hardware to drive a small transformer
that will provide you with an isolated 5V floating supply too.
However, I am MUCH more impressed with the Analog Devices ADuM5241ARZ which
not only h
Ulrich,
If it stops after a while you have it made. Set the trigger to normal and the
scope will record the last transaction...
Well, I am sure it is more complicated than that, but my toughest I2C problem
was a serial EEPROM that I was polling (for read) continuously several times
per second.
One issue with RS-485 is that the Tx and Rx lines are shared and the driver
chip has to be told which direction it is supposed to work. This is usually
done in the serial driver code using one of the modem control lines. I am
not sure if the NTP code provides that signal. If that signal is not
avai
Antonio,
Weight and power consumption are the first methods that come to mind :-)
You are hitting the time-nuts nail right on the head. You cannot rank just
two clocks, you need at least three, so that you can compare them 2 by 2 and
determine statistically the performance of each by comparaison
Have you checked my manuals page?
http://www.ko4bb.com/cgi-bin/manuals.pl
Search for "Ovenair"
There are pictures and an email indicating the Ovenair 49-62 was Option 1
for the HP 8656A signal generator, and information is available in that
manual. Send me a direct email if you can't find the ma
> Attila Kinali <[EMAIL PROTECTED]>, on Sun 20 Apr 2008
> 05:50:21 AM PDT:
>
> > On Thu, 17 Apr 2008 08:47:48 -0700 (GMT-07:00) "Richard W. Solomon"
> > <[EMAIL PROTECTED]> wrote:
> >
> >> You can build a very good GPSDO for about $100 in parts.
> >
> > Stupid question, but if one builds his on
Tom,
While the outputs change state synchronously with the clock, there may be
many gates and latches inside the chip between the clock pin and the output,
and the delay through those will be affected by temperature, supply voltage
glitches and ground bounce, things that are not necessarily very w
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Magnus Danielson
> Sent: Sunday, April 06, 2008 6:18 AM
> To: time-nuts@febo.com; [EMAIL PROTECTED]
> Subject: Re: [time-nuts] GPS noise reduction
>
> Actually, in this application will a bit of int
The links are thoroughly messed up here, not sure what happened with
Outlook, so I'll try again (plain text):
http://www.ko4bb.com/Manuals/5)_GPS_Timing/E10589_Propagation_Losses_2_and_5
GHz.pdf
If the link is broken, just go to
http://www.ko4bb.com/cgi-bin/manuals.pl
and search for E10589
D
I found this paper:
HYPERLINK
"http://www.ko4bb.com/Manuals/5)_GPS_Timing/E10589_Propagation_Losses_2_and_
5GHz.pdf"http://www.ko4bb.com/Manuals/5)_GPS_Timing/E10589_Propagation_Losse
s_2_and_5GHz.pdf
If the link is broken, just go to
HYPERLINK
"http://www.ko4bb.com/cgi-bin/manuals.pl"http://
Some Wi-Fi hardware manuals (haha) have installation instructions and they
give rough indication of the attenuation through common obstacles such as
walls, floors and whatnot. I remember seing one of those not long ago
actually but I have no idea where it is :-(
The frequencies are close enough th
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Bruce Griffiths
> Sent: Monday, March 31, 2008 11:28 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Adding prescaler to HP 5334B
>
> D
mA.
>
> Keith
>
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Didier Juges
> Sent: Monday, March 31, 2008 7:56 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] Addin
I was thinking of buying a few dual shottkys (series configuration) in
SOT-23 package and I thought it would be a piece of cake finding those, but
interestingly, my usual part vendors (Digikey, Mouser, Newark, Allied) don't
carry any that I could use, at least if they do, I did not find them.
Any
No because the GPS receiver takes into account the signals from more than
one satellite. What matters is the relative phase of these signals as they
reach the antenna. The relative phase of these signals does not change as
the signals go down the cable. The delay in the cable is inconsequential as
The phase plots on tvb's web site
http://www.leapsecond.com/pages/tadd-1/3phase2.gif show that the device's
temperature was never stabilized. The closest to being stable is at the 29
minute point on that plot.
Particularly when the phase value goes up (not sure if it's when temperature
goes up or
8:02 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Tboltmon Serial Port Selection...??
>
> Quoth Didier Juges at 2008-03-28 11:03...
> > I wish I knew how to bypass that too, so if you find out,
> please post
> > the answer back h
I wish I knew how to bypass that too, so if you find out, please post the
answer back here.
On the other hand, if you have not already noticed, if the Tbolt is up and
running and plugged in the serial port when the computer boots, your mouse
will appear possessed.
It is a Windows "feature" where
Besides, they smile a lot, so they must be happy :-)
Didier
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Jean-Louis Oneto
> Sent: Thursday, March 27, 2008 6:11 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nu
The Thunderbolt's output impedance on the PPS output is much less than 50
ohms, more like 5 ohms.
If you terminate the other end of the cable with a good 50 ohms termination,
you will be OK, even though it would be better to put a ~47 ohms series
resistor right at the TB output before driving the
It is always hard to tell with NI because they are so mumm about their
designs. If the new card works with old drivers (most will), it is probably
a repackaged version of the old card with more of the stuff in a gate array
or xPLD instead of discretes. If it requires (or recommends) a new driver,
i
tic flip flops from vendors such
> as Micrel and OnSemi, rather than installing the MB506. You
> can easily glue an SMT prescaler to the board upside down in
> the footprint where the MB506 goes, and then connect the
> "dead bug" with little wires to the MB506 connections
The HP 5334A or B with the C channel option has a sensitivity spec of -30dBm
(from memory) up to 1 GHz or so. The C channel has 15mV rms sensitivity at 1
GHz.
The C channel option is rare, but it only requires 3 parts (a diviser and
two dual-shottkys) and a connector (and a hole in the front panel
The MAX232, like all RS-232 interface chips I have ever come across, inverts
the signal.
Didier KO4BB
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
> Sent: Saturday, March 08, 2008 2:48 AM
> To: time-nuts@febo.com
> Subject: Re
For isolation of digital signals such as RS-232 (before level translation),
it's hard to find something more amazing than the Analog Device ADuM5241
http://www.analog.com/en/prod/0,2877,ADUM5241,00.html
It's an SO-8 device, with two digital channels, isolated to 2500V (!) and a
built-in power con
My experience is that when severe multipath occurs, even when short distances
are involved, the GPS receiver seems to get utterly confused and won't provide
a solution.
When I had my GPS antenna only about 2 feet away (above and to the side) from
the top of a signal generator on the top of a c
This issue has been addressed in previous threads, partly as a result of
Trimble designing the Thunderbolt with F connector, intended for 75 ohm
cable.
Here is an excerpt from the Thunderbolt manual Page 39, section 3-5):
Note – RG-59 is a 75 ohm coaxial cable. The ThunderBolt and the Bullet
ant
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
> Sent: Saturday, March 01, 2008 2:25 AM
> To: time-nuts@febo.com
> Subject: Re: [time-nuts] GPS-Attached Equipment Lightning Protection
>
>
> Yes, this is the case, but it's easy
A quick update on my Manuals pages.
The frames and the partial availability of my site are due to my switching
ISP and trying to develop a secure and flexible backup solution.
The manuals are not going away and these issues will be resolved in the next
few days (with any luck).
I have learned a b
Did not work, got this:
We're Sorry.
If you were looking for a particular product, please contact us to see if
that item is currently in stock or you may Request a Quote for that product.
Our inventory changes every day and the item you need may be available but
not listed on our website.
The
This is a very nice thread, in 2 days, I got two very useful utilities :-)
Thanks Tom and John!
I tried Tom's alarm utility while AVG was doing a virus scan on my computer.
This normally slows everything down quite significantly, but alarm kept
ticking regularly and the CPU utilisation of "alarm"
Simple and sweet, thanks John!
Didier KO4BB
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of John Ackermann N8UR
> Sent: Saturday, February 23, 2008 5:53 PM
> To: Discussion of precise time and frequency measurement
> Subject: [time-nuts] Slightly
Most of my projects have a serial port and a standard comm interface. Once I
get that up and running, I use it for debugging.
That's the point where I start to breathe better too :-)
I have had my share of grief with emulators also. It was not enough that
they cost $1,000's and required these mon
Atime implementation on Linux (and I suspect maybe other *nix as well) was,
well, bad, maybe still is. Even if files are in the cache, the OS will
update atime on the disk.
There were talks of fixing that on Linux a while back, I am not sure if it
has been done. I lost track.
In the mean time, -o
Considering the access problems I have had with my ISP in the last couple of
months, I have switched my domain www.ko4bb.com to my backup ISP.
It will take a day or so for the DNS system to flush itself.
In the mean time, you can access it through
http://www.eds-fl.com
The original site's loca
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Chuck Harris
> Sent: Wednesday, February 20, 2008 8:12 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] favorite microcontroller module?
>
> Bob Paddock wrote:
>
Hi Chuck,
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Chuck Harris
> Sent: Wednesday, February 20, 2008 3:21 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] favorite microcontroller module?
>
> When yo
This is probably done for the same reason space electronics is rad-hardened
by prior irradiation of the semi-conductor material before chips are difused
on the crystal. You normally would gain nothing by doing that for earth
bound equipment, unless you are in the military.
I think it only speeds u
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Robert Vassar
> Sent: Tuesday, February 19, 2008 5:36 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] favorite microcontroller module?
>
...
> I regard PIC c
My favorite uC familly is made by Silabs.
They have a line of 8051 variants with excellent performance (up to 100
MIPS) and the SDCC compiler is free.
I have documented the main reasons for liking it there:
http://www.eds-fl.com/cgi-bin/wiki/wiki.cgi?SiLabs
(nomal ko4bb.com web site is down ton
Hi Said,
I am not sure which part we eventually selected. I will let you know, they
are NOT cheap...
In our application, temperature stability and initial unadjusted acuracy
were the prime parameters we were looking for, and the Thaler references
certainly deliver on both accounts.
The MSC1210
Hi Said,
It seems we are at the same point. I have been using a TI/Burr-Brown
microprocessor with a 24 bit ADC and 8 input multiplexer (the MSC1210, which
is actually advertised as a precision ADC which happens to have a full blown
8051, 32k of Flash and all the usual goodies including a long time
Martyn,
What is the type of oscillator used as the frequency reference of the SR620?
How is it characterized?
Didier KO4BB
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Martyn Smith
> Sent: Thursday, February 14, 2008 11:36 AM
> To: time-nuts@f
Said,
What 24 bit DAC do you have in mind?
I have been looking for a standalone 24 bit DAC in a small package and have
not found anything I liked :-(
Thanks
Didier
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
> Sent: Wednes
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Poul-Henning Kamp
> Sent: Wednesday, February 13, 2008 5:07 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] gps timing antennas
>
>
> I would suspect that the
RS-232 specs are just about totally obsolete, but at the time they meant
anything, they required that RS-232 receivers work with as little as +/- 3V
and that they accept +/- 18V at least before failing. Signals between +3V
and -3V are unspecified and therefore may generate an undetermined state.
Ho
To me, the interesting part is that both the Thunderbolt and the Miller
designs appear to degrade the performance of the OCXO in locked mode at
short Tau compared to unlocked. The Z3801 does very well < 300sec, but
degrades the ADEV at Tau farther out. The Fury does best, never worse locked
than un
I am sure it can't have anything to do with it ;-) but the 5370B is only
specified to 100 MHz.
My 5370A stops working around that frequency.
Try simply dividing the frequency by two and see what happens, or mix it
down just enough with a stable oscillator so that the IF is below 100MHz and
the im
There were several of them, must be subliminal...
Anyone tried to run some descrambling code on it?
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Rex
> Sent: Saturday, January 26, 2008 1:50 AM
> To: Discussion of precise time and frequency measu
There was a thread some time ago just about that. It was probably 2007, so
if you look in the archives, you should find it.
I will look for it too, as I want to index it for future reference, and if I
find it first, I'll post it again.
Didier
> -Original Message-
> From: [EMAIL PROTECTE
There are two versions of the 10811. One is as you describe, the other has
feedthrough pins and a small 5 pin connector.
Specs are on my web site:
http://www.ko4bb.com/cgi-bin/manuals.pl?dir=HP_Agilent/HP_-_10811_Crystal_Oven_Oscillator
Didier KO4BB
Jeff Walker <[EMAIL PROTECTED]> wrote:
Here is the spec for the Ovenair 49-62
Hopefully it will be close enough to be helpful.
http://www.ko4bb.com/cgi-bin/manuals.pl?dir=5)_GPS_Timing/Ovenair_OSC_49-62_0950-0411
Didier KO4BB
Geoff Blake <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I know this has been asked before - but I haven't fo
What kind of GPS unit are you trying to borrow?
Don't remember seeing any message to that effect.
Didier KO4BB
Ronald Held <[EMAIL PROTECTED]> wrote:
> I have had no success getting anyone to loan me their GPS units. Does
> anyone have suggestions as to what inexpensive unit to purchase, wh
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Bruce Griffiths
> Sent: Sunday, January 20, 2008 10:44 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] RFTG-m-RB
>
> Nothing like actual measurements to fully c
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Bruce Griffiths
> Sent: Saturday, January 19, 2008 7:31 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] RFTG-m-RB
>
> Bruce Griffiths wrote:
> >> Dividing by 3
John,
The schematic of the 3586 Ext Reference input shows the 10 MHz going
directly into what looks like an ECL line receiver, so a square wave should
not bother it.
Here is a link to the page of the schematic:
http://www.ko4bb.com/cgi-bin/search.pl?search=8-H-5-6b.jpg
Didier
> -Origina
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Poul-Henning Kamp
> Sent: Friday, January 18, 2008 3:58 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Slightly OT: inexpensive USB
> analog-digitalconverter?
Patrick,
For $99, you can buy a Silabs C8051F350 development kit which includes a
microcontroller with built-in 24 bit, 8 channel A/D converter with serial
port and the development tools.
http://www.silabs.com/tgwWebApp/public/web_content/products/Microcontrollers
/Precision_Mixed-Signal/en/C8051
b.com/Test_Equipment/HP10811-Current.png
Here is the link to the Linear Tech page on high side current sense (again):
http://www.linear.com/ad/current_sense.jsp
Didier KO4BB
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Didier Juges
> Sent: F
I forgot the link:
http://www.linear.com/ad/current_sense.jsp
Didier KO4BB
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Hal Murray
> Sent: Friday, January 18, 2008 3:55 AM
> To: Discussion of precise time and frequency measurement
> Subject: R
Be careful that if you do not isolate the A/D converter analog circuits from
the USB ground, you may create all sorts of nasty ground loops with the
computer. When dealing with power supplies, it's always best to be isolated.
I do not know enough about USB to know if it can be simply isolated with
John,
Have you looked at the voltage with a scope at the same time the analyzer is
running?
Could the coupling capacitor be leaking ?
Didier
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of John Ackermann N8UR
> Sent: Sunday, January 06, 2008 2:18
I think the main difference between parallel and series resonance is that in
parallel resonance mode, the capacitance of the crystal holder and wiring to
the crystal is part of the frequency determining parameters, and in series mode
it is not. So it may have a slight effect on temperature stabi
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