Hello,
I am fighting to get 1PPS from my Trimble Tbolt GPSDO. Self-survey
completed and via software the 1PPS also activated
but no1PPS output on the BNC connector. Already tried all the software
possibilities but no help
the 1PPS 74HC04 driver IC does does not get any input signal.
On the
Sorry but forget to mention the Unit NOT from TAPR
-Original Message-
From: [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Thu, 20 Nov 2008 10:20 am
Subject: Re: [time-nuts] Trimble 1 PPS
Hello,
I am fighting to get 1PPS from my Trimble Tbolt GPSDO. Self-survey
completed and via
the 1PPS 74HC04 driver IC does does not get any input signal.
What are you looking at it with?
The pulse is only 10 microseconds wide.
--
These are my opinions, not necessarily my employer's. I hate spam.
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Tom,
Thank you for the valuable inputs. I was quietly hoping that I was
misunderstanding the protocol in some way.
My gut tells me that Checksumcrlf@@ would be believable more than
say 95% (if not 99%) of the time. I've got the following observations:
- 95% is a bad number in accurate timing
Hi Ulrich,
Sure - among other things the FPGA keeps a real-time clock. It ticks away on
a disciplined clock, but the time and date value is constantly kept in sync
with what the GPS spits out as UTC.
So, the FPGA catches some of the GPS messages, but also allow for a straight
path through to a
Hi,
NMEA would have been nice - but this is a timing application.
Stephan.
2008/11/19 Stanley Reynolds [EMAIL PROTECTED]
Looking at the user guide which is the extent of my experience. Would the
position version of the M12+ be a better choice for your application ? That
is trade NMEA-0183
My gut tells me that Checksumcrlf@@ would be believable
more than say 95% (if not 99%) of the time. I've got the following
observations:
I suggest that you debug things in software and then figure out how to
implement that algorithm in the FPGA. You can rearrange code and try again
to
Hi Stephan,
I have been asking my question because I wanted to learn whether an FPGA
was really needed. Don't understand me wrong, I am a dedicated user of
XILINX and ALTERA FPGAs and CPLDs myself, but sometimes a $2
microcontroller will do the job better than any FPGA. It is correct that
you may
Stephan Sandenbergh wrote:
Hi Bruce,
Yes - at this point an external processor is not a real option.
Are you aware of open source code that I could try out?
In hind sight, I should've put a microprocessor core onto the FPGA to do all
the management kind of tasks.
Regards,
Stephan.
100MHz HP digital scope.
-Original Message-
From: Hal Murray [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Thu, 20 Nov 2008 10:59 am
Subject: Re: [time-nuts] Trimble 1 PPS
the 1PPS 74HC04 driver IC does does not get any input
- Original Message -
From: Neon John [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Thursday, November 20, 2008 4:29 AM
Subject: Re: [time-nuts] Oh the horror
[...]
When the aroma of blue smoke wafted through the air, I'd usually
-Original Message-
From: [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Thu, 20 Nov 2008 10:45 am
Subject: Re: [time-nuts] Trimble 1 PPS
Sorry but forget to mention the Unit NOT from TAPR
-Original Message-
From: [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Thu, 20 Nov
Tom,
Thank you for the valuable inputs. I was quietly hoping that I was
misunderstanding the protocol in some way.
My gut tells me that Checksumcrlf@@ would be believable more than
say 95% (if not 99%) of the time. I've got the following observations:
- 95% is a bad number in accurate
I have to apologize because it was my failure to set up this Digital
storage HP scope. Now I got the 1 PPS.it is working.
Rgds Ernie.
-Original Message-
From: Hal Murray [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Thu, 20 Nov
Hi,
Now I'm slightly confused:
My gut tells me that Checksumcrlf@@ would be believable more than
say 95% (if not 99%) of the time. I've got the following observations:
In the above I assumed no data length checking is employed.
- 95% is a bad number in accurate timing applications.
Stephan Sandenbergh wrote:
Hi,
Now I'm slightly confused:
My gut tells me that Checksumcrlf@@ would be believable more than
say 95% (if not 99%) of the time. I've got the following observations:
In the above I assumed no data length checking is employed.
- 95% is a bad number in
Hi Stephan:
I've heard from Art at Synergy that the latest i-Lotus versions of the M12+T
receivers have NMEA enabled. That's to say you can switch to that protocol.
Have Fun,
Brooke Clarke
http://www.prc68.com
Stephan Sandenbergh wrote:
Hi,
NMEA would have been nice - but this is a
I have been reading with interest John Miles' page about his Tbolt
'upgrade'.
http://www.thegleam.com/ke5fx/tbolt.htm
I have a newly acquired Tbolt here, and also have lying around an almost
identical 10811-60111 OCXO which I am considering using with it, exactly
as John describes. However
In a message dated 20/11/2008 17:16:18 GMT Standard Time,
[EMAIL PROTECTED] writes:
What I'd be looking for is a rackmounted unit, no more than 4U high, that
can put out disciplined 10MHz and IRIG-B time code. A Trak Systems 882x series
would be nice, but I know how popular those are.
Brad Stockdale wrote:
[ ... ]
Anyway, on to the reason for this post... I'd like to get some
receivers so I can HEAR and USE the WWVB, WWV, and WWVH signals... I
know that HEARING them may not be a 'normal' request, but I just
would like to monitor the audio as well as being able to
On Thu, Nov 20, 2008 at 10:40 AM, Brad Stockdale [EMAIL PROTECTED] wrote:
o WWVB = 60 KHz
I bought a nice little module from digi-key to handle this.
561-1014-ND, under $11 including the ferrite antenna.
o WWV = 2.5 MHz, 5 MHz, 10 MHz, 15 MHz, or 20 MHz
o WWVH = 2.5 MHz,
The ticks are diferent frequency tines.
From: http://tf.nist.gov/timefreq/general/pdf/1383.pdf :
The most frequent sounds heard on WWV and WWVH are the seconds pulses. These
pulses
are heard every second except on the 29th and 59th seconds of each minute.
The first pulse of each hour is an
Brad Stockdale wrote:
snip
How in the heck do you differentiate between the two stations if they
broadcast on all the same channels?
snip
Brad -
Regarding WWV and WWVH, take a look at
http://tf.nist.gov/timefreq/general/broadcast.htm#1
and
http://tf.nist.gov/timefreq/general/broadcast.htm#7
Ed
Bruce,
Four years ago, I planned to build a three-rack time standard system
similar to the one at Fort Collins. It was a bridge too far and now
I have a surplus of Datum time code generators in the 9100, 9200, and
9300 series. Many of them do IRIG-B and have an external input for 1
MHz.
The three
Do you need the one with the two boards piggypacked (main board and smaller RF
voard) or the single board version.I tried to email you directly, but your
overly paranoid email blocker gets in the way...
_
Color coding for safety:
Sure, I assume you refer to the case when you check the data length as
well? I meant that the Checksumcrlf@@ byte string could also
potentially exist in the data itself, but only in very rare cases
(from there the 95% thumb suck).
The checksum byte can have any value. You can't use it to
I hope you end up liking the binary format; I'm not sure how it could
be improved.
It's a bit ugly that you have to do a table lookup in the packet type to get
the length. That makes it harder to split the transport layer out into a
separate chunk of software.
--
These are my opinions,
Greetings...
I have a used, untested 60 KHz preamp board (no case) for the hp 117A
VLF receiver.
It is the early model using two 13CW4 nuvistors and a mechanical filter.
If anyone is interested, please contact me directly.
Regards,
Peter
Bill Hawkins wrote:
Are you open to vacuum tube
That is due to the wonders of HF propagation.WWV is in Ft Collins
WWVH is in Hawaii so coverage is largely restricted to Asia/Pacific
region
somewhere on NIST's site there is a propagation prediction for all the stations.
On Thu, Nov 20, 2008 at 1:40 PM, Brad Stockdale [EMAIL PROTECTED]
Hi Brad:
To get the best s/n radio you need to have good narrow filters. The NRD-545
uses DSP for the IF filters and so can be adjusted to a 10 Hz bandwidth. This
is the lowest IF bandwidth I know of in any HF receiver including the high end
and military models. The only things with
Hi Stephan:
I was wrong about the stuffing. Got confused with other protocols.
All the Motorola @@ packets are a fixed length.
Have Fun,
Brooke Clarke
http://www.prc68.com
Brooke Clarke wrote:
Hi Stephan:
Check the manual for stuffing, it's not a Thanksgiving term here but has to
do
and follow the instructions there.
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time-nuts mailing list -- time-nuts
At 03:37 PM 11/20/2008, you wrote:
I just checked on eBay right now and didn't see any available right
this second, but I will put in a saved search for them so I can get
email alerts...
I take it back... There are a few. Sorry about that!
Brad
___
At 01:55 PM 11/20/2008, you wrote:
I bought a nice little module from digi-key to handle this.
561-1014-ND, under $11 including the ferrite antenna.
Interesting little module. Cheap too! Looking over the datasheet
right now. Thanks for the pointer.
Brad
At 02:24 PM 11/20/2008, you wrote:
Are you open to vacuum tube equipment?
Surely. Tubes are another interest of mine, but I only really deal
with audio stuff. One of my ham friends tried to ease my fear of RF
equipment by telling me that RF gear was basically just audio gear
with chokes/coils
On Thu, 2008-11-20 at 15:51 -0500, Brad Stockdale wrote:
At 01:55 PM 11/20/2008, you wrote:
I bought a nice little module from digi-key to handle this.
561-1014-ND, under $11 including the ferrite antenna.
Interesting little module. Cheap too! Looking over the datasheet
right now.
Brad,
I started with audio in 1950, got into receivers, never got into
transmitters, except some carrier current stuff. Only real difference
in receivers is the concept of tuned circuits for selectivity as
opposed to wide-band audio.
Well, there's also detection and AGC. Um, and mixing
If I can't get radios that have built in decoders for these
stations, I'd be happy just receiving their audio and then trying to
build my own decoder using a PIC or something...
The typical short wave radio will give you audio on WWV/H.
WWVB is 60 KHz. Most radios don't go that low.
Hi, nuts -- I just got my TBolt from h-whole-bunch-of-b's-bob in
China. He nicely gave me the time-nuts discount, and also included a
power connector with pigtail leads. Including shipping, it was $175
and it took 7 days to get here in W. Wash. You can find him and these
units on eBay at:
On a slightly different subject, albeit somewhat related... Does
anyone know what HP Z3801A's are worth nowadays? I remember when they
first came on the market, they were around $250, then up to about
$400 or so when supplies got scarce. Not sure what happened after
that... Just kinda
Hi Dick:
Did you set the COM port number?
Right click with the cursor on the window.
http://www.prc68.com/I/ThunderBolt.shtml#TBM
Have Fun,
Brooke Clarke
http://www.prc68.com
Richard Moore wrote:
Hi, nuts -- I just got my TBolt from h-whole-bunch-of-b's-bob in
China. He nicely gave me the
Unless you are going to use a different OCXO, there is nothing to do except
perhaps tell it to save the self-survey results and set your foilage mode
if desired. They are plug and play.
-5 V/Hz is the correct kvco parameter; any changes will either degrade the
phase margin and give you a hump in
On Nov 20, 2008, at 4:27 PM, Hal Murray wrote:
ntpd has a refclock driver for WWV/H. I've never played with it.
http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver36.html
I played with it back in the 90's, I hooked up the audio line out
from my Yaesu FT-840 to a SPARCstation 20.
Hi, Bill,
Thanks for the offer, but I also have a goodly number of the Datum
9300's and similar units.
What I really need at the moment is at least a partial turnkey
solution. Ideally, I want to fix the Odetics clock as it has been very reliable
outside of the GPS receiver.
This is about the most I've found.
http://tf.nist.gov/timefreq/general/pdf/2125.pdf
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Gretchen Baxter
Sent: Monday, November 03, 2008 9:03 AM
To: Discussion of precise time and frequency measurement
Subject:
tvb wrote:
I hope you end up liking the binary format; I'm not sure how it could
be improved.
IIRC, there's no length field in the packet; so you have to know the length
of all the messages you might possibly rx, even if you are interested in
just a few of them.
-ch
In message: [EMAIL PROTECTED]
christopher hoover [EMAIL PROTECTED] writes:
: tvb wrote:
: I hope you end up liking the binary format; I'm not sure how it could
: be improved.
:
: IIRC, there's no length field in the packet; so you have to know the length
: of all the messages you
http://www.oup.com/us/pdf/houp/10_3.pdf
OATS Reporting Technical Specifications, NASD
OATS == Order Audit Trail System
All computer system clocks and mechanical time stamping devices must be
synchronized to within three seconds of the National Institute of Standards
and Technology (NIST) atomic
Gentlemen:
Why would the M12+T swap the order of messages?
I write @@Hn and @@Eq in that order to the board and it gives it back to
me in reverse order.
Tried @@Cf then resending the messages. Still the same. Then did it AND
swapped the order of the messages. Still the same.
The manual says
Message: 2
Date: Thu, 20 Nov 2008 15:36:48 -0800
From: Brooke Clarke [EMAIL PROTECTED]
Subject: Re: [time-nuts] TBolt in the house!
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Message-ID: [EMAIL PROTECTED]
Content-Type: text/plain; charset=ISO-8859-1;
Give this a try!
http://www.synergy-gps.com/images/stories/ShopTalk/disabling%20detection%20of%20microsoft%20ballpoint%20mouse.pdf
The serial mouse issue drove me nuts for a while.
Norm
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Hi Dick:
Not only the port number but also the serial parameters, see:
http://www.prc68.com/I/ThunderBolt.shtml#TBM
That's why I gave you the right click hint.
Have Fun,
Brooke Clarke
http://www.prc68.com
Richard Moore wrote:
Message: 2
Date: Thu, 20 Nov 2008 15:36:48 -0800
From: Brooke
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