Geez, you'd think nobody had one of these things.
1. The 5372A doesn't use anything so common as gate time. No, it
uses interval sampling instead. Take a look in the Operating Manual
on page 1-23 Time Interval Measurement with Interval Sampling Arming.
Clear as mud, isn't it? But that's
Hi Marki,
I've never found a soft copy, but the 5371A User's Manual has a Getting
Started chapter that the 5372A manual doesn't have. I found it to be
quite useful.
I'll send you the 5372A program offlist. Be warned, it's embarrassingly
crude. I'd have to work on it before I'd call it an
If you haven't already done so, download the manual - there are multiple
copies on the net - and run through the Operation Verification Tests in
Table 4-1. All you need for that is a BNC cable. If it passes those
tests you can be reasonably sure that everything is alive.
Next, I suggest
?
/tvb
- Original Message -
From: Ed Palmer ed_pal...@sasktel.net
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Monday, August 26, 2013 10:35 PM
Subject: [time-nuts] Looking for Wavecrst Application Note
Hello,
As the subject states, I'm looking
Yes, in many of the more recent Rb standards you're lucky if the crystal
is ovenized at all. But are you sure that they're after good ADEV? I
get the impression that the only thing they're interested in is low
drift for the unit (e.g. for holdover purposes) since they're intended
to be
Hello,
As the subject states, I'm looking for an Application Note published by
Wavecrest. It's called Phase Noise Measurement Using WAVECREST's
Digital Timing System. It's listed on the GigaMax web site, but the
link is dead. When GigaMax didn't respond to my email, I asked
WavecrestDTS.
I just received an Austron 1120S oscillator. Since the 1120 has an
8-pin octal tube plug, I was surprised to find that the 1120S has a
9-pin miniature tube plug. So, before I let the magic smoke out, does
anyone have the pinout for an 1120S and/or any info on any equipment it
might have been
to control the gain and bandwidth of an off the
shelf CMOS inverter and you also need to know its noise parameters.
Maybe adding resistors in series with the power supply leads of the
CMOS inveters and adding some output capacitance will suffice to
adjust the gain and bandwidth.
Bruce
Ed Palmer
with well defined gain (series emitter
feedback) and the low pass filter cap connected between the collectors
rather than opamps.
Bruce
Ed Palmer wrote:
Does anyone know if this situation would benefit from doing something
similar to a 'Collins Hard Limiter' i.e. instead of squaring the
signal in one
On 8/21/2013 5:52 PM, Magnus Danielson wrote:
On 08/21/2013 03:51 AM, Ed Palmer wrote:
Adrian,
I used Timelab to assess the reaction of the DTS-2077 to different
sine wave inputs. The differences in the noise floor are surprising.
The attached picture was made by taking the output of an HP
FYI, I did a teardown on my Wavecrest DTS-2077. It's posted here:
http://www.eevblog.com/forum/testgear/wavecrest-dts-2077-teardown
Ed
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
-nuts-boun...@febo.com] On
Behalf Of Ed Palmer
Sent: Tuesday, August 20, 2013 2:17 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Wavecrest DTS-2077 Teardown
FYI, I did a teardown on my Wavecrest DTS-2077. It's posted here:
http://www.eevblog.com/forum/testgear
the
noise floor of the dts.. Once you run at the units' noise floor, you know your
source is quite good..
Bye,
Said
Sent From iPhone
On Aug 20, 2013, at 18:51, Ed Palmer ed_pal...@sasktel.net wrote:
Adrian,
I used Timelab to assess the reaction of the DTS-2077 to different sine wave
inputs
too but
not as fast from what I have seen.
Forgot I wrote about it in 2009. Oh boy -age kicking in.
Bye,
Said
Sent From iPhone
On Aug 20, 2013, at 20:17, Ed Palmer ed_pal...@sasktel.net wrote:
Hi Said,
Yes, I saw your message from 2009 where you warned about the sine waves. That's
why I
Hi Paul,
Did you see this page that talks about tweaking the 10811 oven controller?
http://www.realhamradio.com/z3801a-turning-point.htm
Ed
On 7/26/2013 10:47 AM, paul swed wrote:
sounds like time to add a R across the temp set R. That will lower the R
and raise the temp. Its also easy to
The schematic has been around for some time. Although it's not the
original site (which I believe is now gone), Didier has reposted the
info at:
http://www.ko4bb.com/Manuals/05%29_GPS_Timing/Z3801/Z3801A_Outer_Oven/Web_Page/Z3801A%20Outer%20Oven%20Controller.htm
If necessary, be sure to
In 2002, this document:
THE CRYSTAL OSCILLATOR CHARACTERIZATION FACILITY AT THE AEROSPACE
CORPORATION
http://www.pttimeeting.org/archivemeetings/2002papers/paper32.pdf
stated:
The Programmed Test Sources, Inc. PTS model #250M6NIGSX-51 low-noise
frequency synthesizer is
used to offset the
. Most of the devices I work with don't even use software flow
control.
Ed
On 7/5/2013 10:06 PM, Chris Albertson wrote:
On Fri, Jul 5, 2013 at 7:03 PM, Ed Palmer ed_pal...@sasktel.net wrote:
I always cursed when I tried to figure out how to wire an RS232 cable
until I realized that transmit had
Heather reports no serial communications on
comm/x.
/Thanks 73,
Jim
wb4...@amsat.org
/
/
On 7/6/2013 10:44 AM, Ed Palmer wrote:
Certainly if you need a full implementation with various control
leads you might have to dig out the breakout box and figure it out.
But the volts / no volts idea
Check with your power company. They may be able to switch taps on the
transformer to reduce the voltage. I don't know what the situation is
for you, but in some places power companies can be forced to
repair/replace equipment that they fry due to faults in their system.
Ed
On 7/6/2013 5:14
On 7/5/2013 3:00 AM, Bruce Griffiths wrote:
Magnus Danielson wrote:
Hi Perry,
On 07/05/2013 07:23 AM, Perry Sandeen wrote:
List,
I was looking on Ebay for some HP E1938A
oscillators
What I found listed were:
HP E1938A 10 MHz Quartz Oscillator with EFC on PC
board. $100 Fluke.l
HP
I always cursed when I tried to figure out how to wire an RS232 cable
until I realized that transmit had a voltage on it while receive was
close to zero volts. So now I just remember that volts on one end
connects to no volts on the other end. Works every time and I don't
have to think about
I have a copy of Understanding Amateur Radio published by the ARRL
in 1963. One of the appendixes is titled Changing Crystal Frequencies
and talks about grinding crystals from FT-243 holders.
Just google on ft-243 crystal grinding and you'll find lots of web
pages and at least one
I just picked up an Austron 1120-2 oscillator. I've looked around for
info on it and found the datasheet on Didier's site, but not much else.
There's a sticker on the side that reads:
-A1-
248096
5MHZ STD
A stamp on the unit reads: PT NO.248096
I also found that it has an NSN number of
Glutton for punishment, aren't you Mark! :)
There's probably no way to get to 10 MHz. I have two of these that I
picked up just to play with. Another purchaser contacted Symmetricom
and actually got some information out of them. The oscillator in these
runs at 58.9824 MHz. The default
On 6/1/2013 9:47 AM, Mark C. Stephens wrote:
Yep, Phase plot is like a Saw tooth.
So, despite the 'lock' LED, it isn't locked. Well, maybe something's
locked, but we're not sure what.
I plugged the house standard as external reference (I am sure I did that
already) and it still drifts
On 5/30/2013 9:44 PM, Mark C. Stephens wrote:
Oh No, it stayed locked, I sat there until 4:30am watching it..
But it's still drifting +/- 2 Hz 8 hours later which annoys me so much!
I will take a page from Ed's book and exercise patience, I guess.
Not much else I can do without disturbing its
questions and decide which directions
are dead ends.
Ed
-marki
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Ed Palmer
Sent: Friday, 31 May 2013 3:58 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] 9390 GPS RX
On 5/30/2013 9:44
On 5/30/2013 1:24 AM, Mark C. Stephens wrote:
Ed, et al,
I was just cleaning up the workbench and this gave me time to reflect of the
FRK repair.
I'd just like to say thanks for your help and Guidance Ed, without it, I
probably would have got there in the end but I would have not been as
On 5/29/2013 4:27 AM, Mark C. Stephens wrote:
Well, what do you know, I turned it up on its end with the heatsink end on a
heatsink and overnight it locked dead on 10Mhz.
Well as far as I can go, 10Mhz exactly, to 10 digits.
Do you mean you didn't have a heatsink on it before? That would be
On 5/29/2013 9:58 AM, Mark C. Stephens wrote:
Uh, well. No one told me about the heatsink thing :)
Section 2 in the manual talks about mounting and heatsinking. You mean
you didn't read the flippin' manual??? ;) Anyway, it's good that you
were able to get it on frequency.
I am using a
there
won't be a frequency difference. That's what a GPSDO does.
Ed
-marki
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Ed Palmer
Sent: Thursday, 30 May 2013 3:31 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] 9390 GPS RX
The frequency offset of 3e-9 is still very high. Since the 9390 will
discipline the FRK, the C-field adjustment of the FRK doesn't really
matter. Before you open up the FRK again, see if the C-field can change
the frequency. If it can, and if the range is similar to the specified
range,
beyond 800 sec., the numbers do
get a little better. Also, remember that most Rb standards aren't
optimized for low AlDev values since most applications don't need that.
Ed
On 5/28/2013 4:10 PM, Ed Palmer wrote:
The frequency offset of 3e-9 is still very high. Since the 9390
-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Ed Palmer
Sent: Monday, 27 May 2013 1:33 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 9390 GPS RX
On 5/26/2013 8:24 PM, Mark C. Stephens wrote:
Ed, I'd unplugged the Rb from the counter
with the family too!
-marks
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Ed Palmer
Sent: Sunday, 26 May 2013 7:54 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] 9390 GPS RX
On 5/25/2013 12:43 AM, Mark C. Stephens wrote:
Hey Ed
I don't have an LPFRS, but if I'm reading the manual correctly, the
fourth column of numbers on the 'M' command (4D, 4C on your screen
capture) is the VCXO control voltage. Shouldn't this be continuously
sweeping up and down until it finds lock? Does the output frequency
sweep up and down
Hi Gerd,
When it locks for a few seconds, make a note of the VCXO control
voltage. Watch it as closely as you can during the lock period. Is it
very near one end of the sweep range? Does it then drift off the end of
the range when lock is lost? That behaviour would suggest that the VCXO
On 5/26/2013 8:24 PM, Mark C. Stephens wrote:
Ed, I'd unplugged the Rb from the counter and into the timer for measurement.
During this time it had dropped out of lock again.
That's why the Allan Deviation is so bad, it was sweeping.
But I didn't realise as there was no counter attached!
I
...@febo.com] On Behalf
Of Ed Palmer
Sent: Friday, 24 May 2013 4:03 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] 9390 GPS RX
Hold on mate! You're not quite done yet. :)
You said you tweaked the cap to get the Control Voltage to 8 volts and saw the
proper frequency. You should be able to move
-boun...@febo.com] On Behalf
Of Ed Palmer
Sent: Friday, 24 May 2013 5:02 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] 9390 GPS RX
I applaud your enthusiasm, but Slow Down! Don't go randomly trying things.
The more you touch, the more you break! If you damage the Rb lamp, you
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Ed Palmer
Sent: Thursday, 23 May 2013 1:16 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] 9390 GPS RX
On 5/22/2013 4:58 AM, Mark C. Stephens wrote:
It's a 9390-55024
I have plugged my counter
On 5/22/2013 4:58 AM, Mark C. Stephens wrote:
It's a 9390-55024
I have plugged my counter into the Efratom rubidium oscillator thing and
disconnected the EFC.
It is actually wobbling ~ +/-650Hz, peaking as much as +/- 1KHz.
So, hazarding a guess, something is very wrong inside the black box
Another factor that limits the (apparent) interest is that the 5065B is
one of the most expensive and hardest to find Rb standards around. Even
on the used market the price for a 5065B in good condition can be
breathtaking. If Corby's work can be extended to other, more common
units, the
I recently made some measurements between 3 oscillators. It wasn't a
true 'Three-Cornered Hat' measurement because the measurements were made
sequentially. When I do the three-cornered hat calculation for the
hopefully 'better' oscillator, I end up trying to take the square root
of a
I think that Vref is derived from the internal voltage regulator that
powers the oscillator. Is it possible that any noise will appear on
both and therefore, they'll cancel each other out? That could even
reduce power supply sensitivity.
You could test that by measuring ADEV with an EFC pot
Hi Mark,
I looked in the manual, but I can't see where it says that the command
is written to NVRAM. Where did you find that?
Ed
On 4/20/2013 11:53 AM, Mark C. Stephens wrote:
I have noticed Z38XX constantly sends:
:PTIME:TCODE FORM F2
Reading the documentation, this is a NVRAM command -
Hi Skip,
You might have seen my reference to the small board in the 'variation 2'
FE-5680. I looked at the signal on the orange lead and found only about
2.02 Vdc. The orange lead goes to the output of a D-A converter on the
small board. So, on a hunch, I used a 10-turn pot to put 0-5V
Hi Bert,
SV6 is the model number for an old Trimble 6 channel GPS board. Info is
available online. Maybe your receiver died.
Ed
On 4/6/2013 5:00 PM, Burt I. Weiner wrote:
I notice that when it first turns on there is a message where I
normally expect to see System Check ok. The message
There's something in the back of my mind that MuMetal is easily
magnetized. If that's true, and if the FRS-C and/or FE-5680 cases are
made of MuMetal (seems like a good chance), they should be demagnetized
anytime they come in contact with a magnet.
Ed
On 4/5/2013 6:22 PM, EB4APL wrote:
Yes, they're all online. Here's the link:
http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/hpjindex.html
The best way to find a model # would be to use google's site: command
with the model # like this:
site:www.hpl.hp.com/hpjournal 83481a
Ed
On 3/29/2013 2:09 PM, Daniel Mendes wrote:
Em
For some reason, I always had trouble with the XP time service so I
disabled it and added a different NTP demon. I never had another problem.
As I understand it, NTP never does DST changes. That's up to your OS to
handle. I live in an area that doesn't do DST changes so I've never had
to
When I was having trouble with my XP system, I could set the time off by
a few minutes and then ask it to do a time sync. It would report
success, but the time was still a few minutes off. At that point I
disabled the time service and installed an NTP program.
Ed
On 3/23/2013 8:30 PM, Rex
Hi Said,
That equation looks similar in form to the specs for any counter. What
are the comparable equations for the 53132A or the 5370(A or B)?
Ed
On 3/17/2013 10:41 AM, Said Jackson wrote:
Volker,
The error I have seen was in the high xE-011's to the low xE-010's. the only
way around
I ran into the same problem a few years ago. I asked Symmetricom if the
unit could be upgraded. They said it could - for the low, low price of
only $1135.
No, I didn't forget a decimal point in there.
$1135.00.
One Thousand, One Hundred, and Thirty-Five Dollars!!
What planet are these
On 3/13/2013 5:19 PM, Mike S wrote:
On 3/13/2013 6:40 PM, lstosk...@cox.net wrote:
Some of the little magnetic attached antennas on eBay will operate on
3-5V. More problematic is using the older antennas which require 5V
with the newer chips such as the LEA-5,6,7 series which run on 3.3V.
The recent thread on the 5370B resolution reminded me of a couple of
questions I have about my unit. Mine has a bit of a noise problem so I
thought I'd work through the operator verification tests and a couple of
the diagnosic flowcharts and see what popped up. The results turned out
to be
On 2/19/2013 12:54 PM, Magnus Danielson wrote:
On 19/02/13 19:36, Ed Palmer wrote:
Hi Stu,
Did you find the long message threads from April May of last year
where I was trying to fix my 304-B? Look for Antique Rubidium
Standard, General Technology Corp model 304b and Antique Rb
Standard
Hi Stu,
Did you find the long message threads from April May of last year
where I was trying to fix my 304-B? Look for Antique Rubidium
Standard, General Technology Corp model 304b and Antique Rb
Standard. Lots of good info from guys like Magnus Danielson, Paul
Swed, Ed Breya and others.
I know that when making AC measurements on various OCXOs of the same
type, you have to expect wide variations in the results. e.g. TVB's
Allan Deviation measurements on a selection of 10811A oscillators at
http://www.leapsecond.com/pages/z3801a-osc . But what about DC current
measurements?
Deviation measurements, review
everything to see how, or if, oven 'noise' correlates to Allan Deviation
results.
Thanks Bob,
Ed
Bob
On Feb 18, 2013, at 2:40 PM, Ed Palmer ed_pal...@sasktel.net wrote:
I know that when making AC measurements on various OCXOs of the same type, you
have
oscillators draw a few milliamps ( up to 10 ) more than the quiet
one. That might allow them to warm up quicker.
Thanks,
Ed
Bob
On Feb 18, 2013, at 5:32 PM, Ed Palmer ed_pal...@sasktel.net wrote:
Hi Bob,
On 2/18/2013 2:42 PM, Bob Camp wrote:
Hi
Like any control loop, gain, bandwidth and noise
. Doesn't that mean I have about 4 to 5 volt
margin if it's locked at 12 volts?
I had to adjust the capacitor out almost all the way to get it to lock. If I
need to adjust it more can I use the C-field adjustment or should I stay away
from that?
Garren
On Feb 9, 2013, at 10:48 PM, Ed Palmer
? Going to bed. Will check it tomorrow.
Garren
On Feb 8, 2013, at 8:25 PM, Ed Palmer ed_pal...@sasktel.net wrote:
Hi Garren,
I suggest that you get the Thunderbolt working first. Without a known 10 MHz
source to compare to, you're flying blind. Once the Tbolt is running, you
should be able
Hi Garren,
I suggest that you get the Thunderbolt working first. Without a known
10 MHz source to compare to, you're flying blind. Once the Tbolt is
running, you should be able to check the frequency of the FRK by feeding
both into your scope. Trigger on the Tbolt and watch what the FRK
I use a Digi serial to ethernet terminal server for various serial
devices. You put the client software on your PC and the terminal server
ports show up as COM ports on the PC. This keeps the physical COM ports
free for any critical timing applications.
Drivers are available for Windows 98
I don't know if it would work on the Prologix adapter, but when you
install the drivers for the NI controller, they include a program called
'Measurement Automation Explorer' that includes the ability to scan
the bus, eavesdrop on the bus, send low-level commands and get
responses, etc.
Ed
Hi Joe,
I just did a quick search and found that the BP-1600 uses EPP (Enhanced
Parallel Port) protocol on the parallel port rather than using the port
like a GPIO port. Since this is a higher-level bidirectional protocol,
it should be easier to find a USB converter that will work. Look for
A couple of years ago I bought an Intel Atom Dual Core board. It's
equipped with 2 com ports and 1 LPT port. A quick check at Newegg.com
shows that most, but not all, Atom boards (regardless of brand) still
include one or two COM ports and 1 LPT port. So, for somewhere around
$100 or less
In the past there has been much discussion on this list regarding the
relative strengths and weaknesses of the 5370 (20ps resolution) and the
5371/5372 (150ps resolution) units. There are other units that have
even better resolution, but they tend to be pricey and/or more specialized.
Moving
They are neat toys, aren't they? :-) I discovered them a couple of
years ago. Since then I've collected a few from ebay to play with.
They're oddball units with no documentation, but they weren't too hard
to decipher. I even cobbled together a phase-lock system for one. It
worked, but it
Hi Fabio,
A few years ago I got one of the programmable FE5680 units. It included
the same small, square board that I can see in your pictures. Only 3
wires: red, black, and orange. My unit didn't have any EFC control.
On a hunch, I checked the orange wire and found that it was the EFC
Since I have a Z3801A this is an interesting development. Do you expect
to see improved performance or is this simply to replace a dead VP
receiver and bring the Z3801A back to life?
My 6 channel VP receiver was flaky so I replaced it with an 8 channel
model. My Holdover Uncertainty
On 12/21/2012 11:12 AM, Bob Camp wrote:
Hi
The holdover uncertainty prediction is far more a function of your OCXO than of
the GPS.
Bob
On Dec 21, 2012, at 12:00 PM, Ed Palmer ed_pal...@sasktel.net wrote:
Since I have a Z3801A this is an interesting development. Do you expect to see
I don't think that will work, Paul. The Z3801 is designed for the VT
receiver and uses commands that are not supported by the M12 or the
SSR. I believe there has been discussion on this in the past.
Now, maybe with a bit of arm twisting, whining and grovelling we could
get Synergy to write
Just set up your PVR to record it. You can watch it later.
Oh . uh . wait.
Ed
On 12/20/2012 11:16 AM, Burt I. Weiner wrote:
Excuse me for asking... Can anyone tell me what time the world is
supposed to come to an end tomorrow? We have a lot of shopping to do
and thought it would be
What are the horizontal and vertical settings for that picture?
Ed
On 12/18/2012 12:29 PM, cdel...@juno.com wrote:
I was recently repairing a noisy A3 module for an HP 5065A.
The phase modulator has 4 varactor diodes in parallel.
Since I suspected a diode, I removed them one at a time.
Of
On 12/2/2012 4:45 PM, Magnus Danielson wrote:
Erich, Edgardo,
On 12/02/2012 09:27 PM, Edgardo Molina wrote:
Dear Erich,
Welcome to this fine, friendly and knowledgeable group. You just
can't imagine how much I have grown in the field with the invaluable
support from every member here.
Hi Chris,
The first thing you should do is join the EIP_Microwave group at yahoo:
http://tech.groups.yahoo.com/group/EIP_Microwave
There's lots of info and help there for EIP counters.
Don't worry about the signature analyzer for now. It would normally be
used if the processor was dead.
Hi Don,
Yes, I've heard of SRDs. I think every Rb standard uses them. I
recently purchased a YIG Multiplier that includes an SRD followed by a
YIG filter. But, from my reading, there are some significant issues
that you run into when driving an SRD. I'm still playing with mine.
Ed
On
Did you see that Symmetricom has the MFTS (Modular Frequency Timing
System) which is described as the replacement for the MFS. The manual
includes a warning not to interchange the modules between the two
systems. There may be some value in reviewing the MFTS manual to see if
there's anything
I have a similar unit that I picked up a few years ago. It only has a 1
PPS output. That's the way it was designed. There are so many
different versions of this stupid model that it's impossible to be sure
what you're buying until you get it on your bench.
If yours is like mine, the DDS is
I don't know about the '202' part, but here's a data sheet for the PRFS:
http://www.gigatest.net/datum/PRFSDS.pdf
The data sheet doesn't say which Rb oscillator is inside. Is it one of
the standard Datum models or a special one?
Ed
On 11/20/2012 12:47 AM, Edgardo Molina wrote:
Dear
detection in their firmware rather than in the receiver.
Bob
On Nov 5, 2012, at 10:11 PM, Ed Palmer ed_pal...@sasktel.net wrote:
Hi Azelio,
On 11/5/2012 4:09 PM, Azelio Boriani wrote:
Very interesting... is it using the binary protocol?
Yes, standard Motorola binary format.
Maybe a serial link
When I look at the data that the VP is sending to the Z3801A, all I see
are the Ba, Bb, and Bn commands. I don't know if any of those have
enough low level information to play with.
But if this is a firmware issue, shouldn't there be lots of Z3801As with
this problem? I suspect that there's
I understand that the 'B1' start to the model number means that it's
quite old.
I don't remember if I ever did a full reset so I just did one. We'll see
what happens.
Thanks,
Ed
On 11/6/2012 10:20 PM, Mike S wrote:
On 11/6/2012 2:59 PM, Ed Palmer wrote:
But if this is a firmware issue
I've had a Z3801A for about a year. It's always had an issue where the
number of satellites tracked will drop to zero for one or two readings
and then jump right back where it was ( often at 5 or 6 satellites ).
This often (but not always) affects the EFC and/or PPS and/or HUP. My
Tbolt is
On Mon, Nov 5, 2012 at 10:38 PM, Ed Palmer ed_pal...@sasktel.net wrote:
I've had a Z3801A for about a year. It's always had an issue where the
number of satellites tracked will drop to zero for one or two readings and
then jump right back where it was ( often at 5 or 6 satellites ). This
often
On 11/5/2012 11:27 PM, Hal Murray wrote:
azelio.bori...@screen.it said:
Very interesting... is it using the binary protocol? Maybe a serial link
error, the binary protocol has a checksum (yes, NMEA too). Check the serial
link levels with a 'scope, maybe that the Z3801 firmware waits to see
Does anyone know what the story is regarding that site? There's a
wealth of hard-core Time-Nut information there, but after the first
level or two, all the links are dead. The main page (in Japanese) is at
http://etoysbox.jp. The English link takes you to
K1602TE (note the different part number) oscillators have been sold on
ebay in the past. Keep an eye out there in case more appear. You could
also contact the people who sold them and see if they have one or two
more lurking in the corners.
Other than that, it's just a TCXO that uses the
The HP / Symmetricom 58536A has a gain spec of 0 +-3 db so something is
clearly wrong. Did you power it through a spare port? Also, the
isolation spec is 26 db @ L1. The 50 db spec is for L1 +- 40 MHz.
I looked inside mine and found that there's an input filter(-1db), 21 db
amp, 4 way
As you've found, time interval counters by themselves can't measure
Allan Deviation to the levels required for today's precision oscillators.
Here are three google searches - either a general search or search the
Time Nuts archive at www.febo.com. They will get you started in the
topic of
Would this characteristic be similar across all 10811s or would there be
as much unit to unit variation as there is for aging and Allan Deviation?
Ed
On 9/30/2012 11:03 AM, Richard (Rick) Karlquist wrote:
I recently modified an old 10811 to bring out the crystal
leads on miniature coax
There are thermal pads that are thermally conductive. You typically see
them in laptops and, oddly, optical drives. They're usually one or two
mm thick and very soft and squishy. Pull the bottom plate off any
full-size optical drive and you'll probably find one or two pieces. I
see lots of
It's important to remember that on a computer, the wattage shown has no
relationship to the wattage pulled from the socket. The numbers shown
are maximum values. You have to measure the power draw and you have to
measure it in volt-amps, not watts because that's how residential power
is
I was afraid that this topic would turn into a swamp and I didn't help
things by getting it backwards. Yes, the residential meter measures
WattHours, not VoltAmpHours. My apologies for adding confusion to an
already confusing topic.
While new PCs may have power factor corrected power
Hi Bert,
I see on the data sheet that the tuning voltage is supposed to be -10 to
+10 volts and that the supply voltage is +22 to +30 volts. I suspect
that one side of the varactor is supposed to be biased at one half of
the supply voltage. But in your case, it looks like that bias is now
Bert,
I wasn't suggesting amps of current. A normal reverse-biased diode
would give nanoamps of current flowing out. Microamps (or more) of
current flowing in would show that the internal biasing of the varactor
was messed up. A bad diode could also show current flowing in, but your
-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ed Palmer
Sent: Wednesday, July 25, 2012 8:28 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 5MHz ocxo
I haven't heard of that trick before, but it sounds interesting. What's
the wattage
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