I am using hp58516a distribution amplifier. Trimble active antenna,
Trimble TB and BC637PCI constantly connected to that unit. And time to
time I connecting some DUT and GPS modules to it. It works for me.
Regards,
V.P.
On 2015-05-04 08:18, Oghma wrote:
Hi, all
I've only recently joined
(and
it’s in 100’s of ns) or you have it
set to frequency mode and have a very stable system.
Bob
On May 2, 2015, at 9:53 PM, d0ct0r t...@patoka.org wrote:
Hello,
I would like to create some charts for ADEV for following setup:
HP5386A counter connected to External REF. (OCXO). The input of
counter
Hello,
I would like to create some charts for ADEV for following setup:
HP5386A counter connected to External REF. (OCXO). The input of counter
connected to my DDS VFO. The frequency on VFO is 2853000 Hz.
Here is what I got from counter via GPIB:
S +3.505082408E-7
S +3.505082408E-7
S
the PPS into the scope trigger on step 2.
The low repetition rate on the PPS would make this difficult on an
analog scope; on a digital scope it is easy. You can use any
sub-harmonic that is less than or equal the counter reference
frequency (10 MHz).
Brent
On 4/24/2015 3:45 PM, d0ct0r wrote
Hello,
The input: HP 5386A which I would like to calibrate, Well warmed Tremble
Thunderbolt (1PPS only), 10 Mhz Datum OCXO (unknown accuracy), Rigol
1101E Oscilloscope.
The goal is to calibrate counter to read the Datum OCXO.
===
Reading the manual for 5386A,
connector to patch the 10 MHz to two places at once?
Bob
On Friday, April 24, 2015 5:06 PM, d0ct0r t...@patoka.org wrote:
Hello,
The input: HP 5386A which I would like to calibrate, Well warmed
Tremble
Thunderbolt (1PPS only), 10 Mhz Datum OCXO (unknown accuracy), Rigol
1101E Oscilloscope
Following my request, I am curious about modding of HP 5386A. My unit
has TCXO. Is it possible to replace that existed TCXO by third part OCXO
? Like Morion MV89A, for example ?
--
WBW,
V.P.
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To
Hello, Netizens !
I am wandering what is the average human ability to visually compare two
clocks ? Let say I have XClock application running on one machine
(stratum 1 NTP) and I have my project clock close by. And I would like
to match the reading. If I'll see the difference, which range it
In my project, I was using LT6957 to share 10Mhz from my TBolt. It was
perfectly fine for my setup. I split 10Mhz to feed the clock of MCU and
second output was connected to DDS block (AD 9852).
Regards,
Vlad
On , Chris Wilson wrote:
27/03/2015 17:14
My T/Thunderbolt has operated
Hello,
That Q1 is MAV1-0104 made by Mini-Circuits. This part is exact
replacement for the MSA-0104, which was in TenTec kits early.
The schematic of that pre-amp is pretty simple:
+12 V
|
[ ] (470 Ohm)
Today, I did the check the settings for my BC637 card. I was surprised
that its overwrite my manual setting for the Leap Event by following
information:
Time Settings:
Mode : GPS
Time Format: Binary
Year : 1995
Reading about leap seconds for the past two days, I found that common
solution for it - just encode leap second event proactively and wait
for it.
Of course that possible only if device has that option. For example,
BC637PCI has a menu item 7. Program Leap Event Seconds. Which I did.
Now,
This is an issue indeed. Here is what I get from MySQL Data Base support
site:
Before MySQL 5.0.74, if the operating system is configured to return
leap seconds from OS time calls or if the MySQL server uses a time zone
definition that has leap seconds, functions such as NOW() could return
Tom,
Thanks for the comments ! In my design I am using NMEA as an option to
set initial time on the clock. Its just faster and more convenient than
doing it manually. And in the other (rare) occasions when clock logic
could decide to sync. RTC module time with time received from GPS
module.
Tim,
I was using perl as a tool to calculate UNIX time. As my project based
on STM32 MCU, I have no option to use time libraries. And I dont' think
its applcable for my project. I am thinking what exactly of that UNIX
time is. Looks like its using simple constants, like we have 86400
Hello,
As I am in the process of creation of my own Nixie clocks. And it
probably good time frame to clarify one thing about leap seconds. In my
project I am using GPS module as an option to have current UTC time and
also to have 1PPS signal to do auto-adjustment for external RTC module.
To whom it may concern, here is the note regarding of CMOS level
difference for two product AD9852 from AD and LT6957 from Linear.
My attempts to feed AD9852 directly from LTC6857-3 has failed. AD9852
just ignored the REFCLOCK signal coming from LTC6957-3. So, I'll need to
think about some
) to the same
pin AD9852, its accept that. The chip to heat up and generate IO
UPDATE.
On the AD9852 evaluation board, AD is using MC100LVEL16 as a level
converter. I would like to try that and see how it will be.
From: d0ct0r t...@patoka.org
To: time-nuts
Just to confirm: MC100LVEL16 solved the issue with signal levels.
On 2014-04-25 14:54, d0ct0r wrote:
AD was comparing apples and oranges. The LTC6957-3 has CMOS outputs,
which go from 0.2V to Vdd-0.3V (with a 3mA load). Perhaps they were
looking at the LTC6957-1 which is LVPECL and would
. But this may be the case to have something of interest to
actually do. In either language.
Regards
Paul
WB8TSL
On Mon, Apr 14, 2014 at 12:27 PM, d0ct0r t...@patoka.org wrote:
I was experimenting with the same setup for STM32 MCU. This
microprocessor has accept the sine wave from external OCXO
I was experimenting with the same setup for STM32 MCU. This
microprocessor has accept the sine wave from external OCXO or GPSDO. No
problem with this. The only thing: I was need to start MCU from slow
watch crystal first. And then switch it to work to external one. In
another case I got
I am not sure about Arduino, but probably it too has so-called timer
overflow interrupt. If so, then its possible to use that other
interrupt and some long (lets say 32-bit) RAM variable to accumulate
real value of counter.
In one of my project I was using timer overflow and Besier method
carry
corruption in the multi-byte value of t_besier. True, this works fine
on a 32- or 64-bit cpu, but not on an 8- or 16-bit cpu.
Hmm...
- Original Message -
From: d0ct0r t...@patoka.org
To: time-nuts@febo.com
Sent: Thursday, April 10, 2014 10:12 AM
Subject: Re: [time-nuts] First success
The timers are 16-bit but I extend it to 64 bits in software. When the
timer rolls over I add 65536 to the software variable mono_epoch. At
BTW, its possible to extend timer to 64 bit using special feature of
ST32. Its when one timer (master), controlling the other timer(s)
(slaves). See
Thanks ! As soon as I figured out about double DLE bytes - everything
is back to right track.
Regards,
V.P.
On 2014-03-26 04:46, Götz Romahn wrote:
Am 25.03.2014 22:43, :
Today I spent good part of my time to figure out that my version of
Thunderbolt has some issue with the TSIP protocol
: It is work in progress, so not all menu selections actually
work)
On Tue, Mar 25, 2014 at 7:11 PM, d0ct0r t...@patoka.org wrote:
Much thanks Tom and Mike ! I missed that point. In another word,
T-Bolt sending DLE data wrapped by another byte ! Now I know !
On 2014-03-25 19:55, mike cook wrote
Today I spent good part of my time to figure out that my version of
Thunderbolt has some issue with the TSIP protocol definition. I am using
following document: ThunderBolt GPS Disciplined Clock User Guide,
Version 5.0, Part Number: 35326-30, November 2003
In that particular PDF file, there
Much thanks Tom and Mike ! I missed that point. In another word, T-Bolt
sending DLE data wrapped by another byte ! Now I know !
On 2014-03-25 19:55, mike cook wrote:
Le 25 mars 2014 à 22:43, d0ct0r a écrit :
Today I spent good part of my time to figure out that my version of
Thunderbolt
I would assume that using two voltage regulators will spread the load.
For the AD9851 I'am planning to put external radiator glued on top of
it.
Regards,
V.P.
those parts dissipate a fair amount of heat, and they're not very big.
If you turn on everything in the 9854 AND run it at 300
Hello,
By design, DDS stones like AD9852 from Analog Devices, required
separated power lines for AVDD, DVDD and VCC.
What will is simple solution for that ? I am planing to use following
approach: +5V from linear PS, then three LC filters, then three 3.3V
voltage regulators (Ex.: MC33269T)
Many thanks indeed for detailed answer ! Yes, I will using Evaluation
Board for my project.
Regards,
V.P.
On 2014-03-16 00:06, Charles Steinmetz wrote:
By design, DDS stones like AD9852 from Analog Devices, required
separated power lines for AVDD, DVDD and VCC. What will is simple
in a hardware frequency
diver as a pre-scaler.
On Tue, Mar 11, 2014 at 8:24 PM, d0ct0r t...@patoka.org wrote:
Hello,
I am experimenting to build frequency counter using external OCXO
and ST32 MCU. The OCXO is external DATUM 2750013-1 device which
produce 10Mhz sine wave. I connected its output to OC_IN
frequency diver as a pre-scaler.
On Tue, Mar 11, 2014 at 8:24 PM, d0ct0r t...@patoka.org wrote:
Hello,
I am experimenting to build frequency counter using external OCXO
and ST32 MCU. The OCXO is external DATUM 2750013-1 device which
produce 10Mhz sine wave. I connected its output to OC_IN on MCU. I
Hello,
I am experimenting to build frequency counter using external OCXO and
ST32 MCU. The OCXO is external DATUM 2750013-1 device which produce
10Mhz sine wave. I connected its output to OC_IN on MCU. I have few
challenges now.
First, looks like I need to create some delay to turn on MCU
Hello,
I am looking for the advise: what will be the better method to connect
GPSDO module by short extension cable to put its antenna input on front
or back panel ?
Lets say, GPSDO module has female “F” connector. And I would like to
have BNC connector on back panel of my project.
load, diode and multimeter as indication if you don't have an
accurate power meter.
Or if you ship it to me I can stick it on a VNA and give you exact
specs.
HTH
Robert G8RPI.
-
FROM: d0ct0r t...@patoka.org
TO: time-nuts@febo.com
SENT: Sunday, 2 March 2014, 5:54
Do you have a scope? Any overshoot/bounce crap? (Not likely with low
power
CMOS.)
Attached is screenshot from USB-based scope. I'll going to switch wires
to see any difference.
--
WBW,
V.P.attachment: gps2rtc.PNG___
time-nuts mailing list
To answering myself: I think nothing wrong with DS32XX. I hooked up GPS
1PPS output to the same timer (different channel) where I have 1PPS from
RTC. Now I see something like this.
# Delta GPS: 7330, Delta RTC: 7330
# Delta GPS: 7330, Delta RTC: 7329
# Delta GPS: 7330, Delta RTC: 7329
#
Here is interesting topic about NTP on Raspberry PI (typical usage of
ARM and Linux bread on top of it)
http://www.synclab.org/?tag=testing
Basically, TCP stack on ARM usually come from one source - its a Adam
Dunken TCP stack. Then its is MII part and the hardware which doing
Ethernet.
Hello,
I am experimenting to compare 1PPS outputs from Dallas/Maxim DS3231m
chip and 1PPS output from generic GPS module. I attached both signal to
MCU timers with free run counters and measure the interval between of
raising edges.
Here is the typical results:
# Delta GPS: 3659, Delta
I am impressed by Casio engineers who created tiny antenna for my wrist
watch. I don't know how, but that Pathfinder able to catch and decode 60
khz wwvb in noisy city environment. And it did even better when i was
500 km north !
:40, Alexander Pummer wrote:
here are the other 60kHz
Its still interesting to read an article from Radio-Electronics Magazine
with date stamp back to August 1973. In that article Don Lancaster
explain few classical techniques how to handle WWVB band.
Regards,
V.P.
On 2014-02-20 20:42, Clint Turner wrote:
Several years ago I spotted a clever
I would like to ask an advise for following:
Lets say I have a DS3232 RTC connected by I2C to some MCU. The maximum
allowed I2C bus speed is 400KHZ. And I need to read time (HH:MM:SS) from
it. It will be THREE SEPARATE REQUESTS for each part (hours, minutes and
seconds). My concern: what if I
if you are so unlucky to read the time
just before the seconds flip over and as I said, you detect a second
flip by reading twice.
But it appearts this chip is more sophisticated and has buffers
On Fri, Feb 14, 2014 at 2:20 PM, d0ct0r t...@patoka.org wrote:
I would like to ask an advise
I modified two things for now. Its a demo software (Linux edition).
And refclock_banncom driver for NTP. Personally, I would prefer to
modify microcode or library. But that is proprietary with no source code
around.
Regards,
V.P.
On 2014-02-13 10:46, gandal...@aol.com wrote:
You've lost
I figured out why GPS FW information was not available by request. To do
such requests BC637PCI needs to be in GPS MODE. If I run the request
in Free Run, it return the error code. Here is FW infomation from my
GPS module:
GPS Packet Menu
1. Request Packet 41 - Gps Time Packet
2. Request
Sorry for confusing information. I have some small Trimble antenna which
currently connected to BC637PCI. However I never get it locked with
that antenna:
GPS PACKET 46 - GPS HEALTH PACKET
Status: No usable satellites
Error: 63
Binary Time: 02/11/2014 17:28:40.0572284 Status: 7
Binary
You are right ! Now I am going to modify the code a lit bit.
Each time as we call bcReadBinTimeEx or bcReadBinTime, we need to add
magic number to unsigned long pointer which store major time. Example:
if (bcReadBinTime(stfp_handle, btm[1], btm[0], stat ) == 0) {
Hello,
I'll be glad to check my GPS module to see what is going on there,
however I am still waiting for the GPS antenna to be delivered. I tried
to use some small form factor Trimple GPS antenna with BC637, but
on-board GPS module couldn't lock with it. So, my BC637 is working in
freerun
Hello,
I have a quick question about TADD-3 Pulse-per-Second Distribution
Amplifier. Does anybody tried to use TADD-3 with Trimble T-Bolt in the
configuration, when its using 1PPS and 10MHZ as TADD-3 inputs. The idea
is to use TADD-3 to share BOTH t-bolt frequency outputs. Thanks !
--
WBW,
I found the document about Trimble ACE3 module:
http://www.symres.com/files/ACE3.pdf
Here is the paragraph about WNRO:
Effect of GPS Week Number Roll-over (WNRO)
The ACE III GPS module has been designed to handle WNRO, and there are
no
On 2014-02-07 03:00, mike cook wrote:
Le 7 févr. 2014 à 00:18, d0ct0r a écrit :
Hello,
Does anybody seen any links to the information how to implement
external OCXO to Symmetricom PCI TFP BC635/BC637 ?
check the Symmetricom datasheets. You don't mention the version you
are needing info
Great ! Super ! Thanks a LOT !
Also, Symmetricom shared the resource for the latest version of that
driver [BCPCI-V830 build 120].
http://www.symmetricom.com/bus-level-timing-sdk-and-driver-downloads/
I tried that on Ubuntu 12.04.3 LTS x86_64, kernel 3.2.0-58-generic. And
its works for
, d0ct0r a écrit :
Hello,
Does anybody seen any links to the information how to implement
external OCXO to Symmetricom PCI TFP BC635/BC637 ?
check the Symmetricom datasheets. You don't mention the version
you
are needing info for , IRIG/GPS.. Anyway, all that I glanced at
show an Exr
Thanks everybody for the bit of information !
I have a Revsion C and Revision K manuals. In Revison K its only
one note about OCXO:
An internal 10 MHz VCXO (Voltage Controlled Crystal Oscillator) is
disciplined to the
reference source. The VCXO output drives all timing functions on the
that card as a source of 1PPS and 10MHZ - not to feed it from
another
reference. I though it is possible to do some modding to replace
VCXO
by OCXO.
PCI Board Revision ID : 18 (0x12), Firmware Version : DT10041V11
On 2014-02-07 03:00, mike cook wrote:
Le 7 févr. 2014 à 00:18, d0ct0r
Hello,
Does anybody seen any links to the information how to implement external
OCXO to Symmetricom PCI TFP BC635/BC637 ?
--
WBW,
V.P.
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