Chris H wrote:
Would be good as a timing source for GPS
... make a PC into a Stratum 0 timing device?
I think it would count as stratum 1, since you are 1 hop
away from a master time source.
This page may be of interest,
http://www.satsignal.eu/ntp/FreeBSD-GPS-PPS.htm
Trimble Thunderbolts
Yes sorry -- stratum 1 -- brain fart :(
On Fri, 2010-07-09 at 06:32 +, Paul Nicholson wrote:
Chris H wrote:
Would be good as a timing source for GPS
... make a PC into a Stratum 0 timing device?
I think it would count as stratum 1, since you are 1 hop
away from a master time
I might go for the Garmin one to start with, and see how it all works..
and then move up to a more reliable source of timing source in the
future...
When you say Reliable, what exactly do you all mean---
does it loose time?
Does it loose lock to the satellites?
because it's only millisecond
ch...@archnetnz.com said:
I found this one: Garmin GPS 18 PC GPS Engine
http://www.triginstruments.co.nz/catalog/product_info.php?products_id=1301os
Csid=b80759ac903096c20d806ddeb3d71121
Which is the 18X and looking at the manual for it, it says it's 1pps with 1
microsecond accuracy.
Yup.
Which is the 18X and looking at the manual for it, it says it's 1pps with 1
microsecond accuracy.
Yup. That URL is for the LVC version. The PC version is the one powered
from a cigarette lighter. (Your first line above says PC when I assume you
mean LVC.)
Sorry -- I had book marked
Hi Chris,
You need the LVC to make sure you have the 1PPS available. The PC may have it
in the cable but you can't be sure. The 18X is OK for NTP but a timing GPS in
position hold is better. The Tbolt is good but has a ovened 10MHz oscillator
that you don't need unless you want to keep time
Also see http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver29.html
For palisade Tbolt NTP info.
Robert G8RPI.
--- On Fri, 9/7/10, Chris H timen...@archnetnz.com wrote:
From: Chris H timen...@archnetnz.com
Subject: Re: [time-nuts] GPS Timing Source -- looking at buying
To: Discussion of
Hi
The Thunderbolt has a GPS and an OCXO inside it. It's built in smarts align a
PPS created from the OCXO to the GPS PPS. This allows the PPS to be more stable
than a normal GPS PPS (less jitter). It also provides holdover on the PPS if
and when GPS sat's are not available.
Since your
I seem to remember someone saying they had actually tried one. I am looking
to put another repeater on the air and while I have another TBOLT, I like
the fact that the CW12-TIM takes a single supply. Of course, I'll have to
have 5 volts to power the antenna but I can get the 3 volts for the CW12
Hi
The output from the CW12 is straight off of a DDS so it's pretty dirty (phase
noise) compared to a TBolt. Depending on just what your repeater is looking for
that may or may not be an issue. The unit should hold +/- 30 Hz at 900 MHz
frequency wise.
There are multiple firmware versions of
Hello John,
I have a CW-12, but haven't built it into anything yet. Here's some
info I posted recently on the 10 MHz output.
http://www.febo.com/pipermail/time-nuts/2010-June/048196.html
Also, Navsync has an application note that talks about cleaning up the
10 MHz output. Basically,
Hal (and everyone)
In television and radio broadcasting we use a time code that is a
Manchester-encoded 2000 bps (50 Hz countries) or 2400 bps (60 Hz
countries) signal which has been low-pass filtered (~7.5 KHz) so that
it can be directly recorded on an analogue audio track. EBU is the
Hi
Ok, I've set up a new project at Mouser for the PICTIC II parts. Assuming the
magic works it's at:
http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=8736DCEE10
You can also go to their EZ Buy page and enter code 8736DCEE10 to get to the
project.
There are a few special
I was thinking of using a 74F175 not as fast uses more power but I have it.
Stanley
snip
7) The 74AC175 is un-obtanium in a PDIP package the project shows a 74ACT SOIC
version, you'll have to kludge it on to the board Logic levels on the clock may
impact accuracy (but probably won't).
snip
Bob,
I included the option to go with a TTL output for users without a serial
port that might need to feed TTL into an internal USB converter in their
project or to drive a PC port directly with a short cable. Including the
extra pads on the board and the TTL invert flag in the code adds no cost.
q4 and the 3/8 trimmers are in my list.
On Thu, Jul 8, 2010 at 8:34 PM, Bob Bownes bow...@gmail.com wrote:
I'll get these 2 corrections in tonight. I was wondering if the 3/8
parts would fit.
On Thu, Jul 8, 2010 at 8:07 PM, Bob Camp li...@rtty.us wrote:
Hi
Another thing I think we need to
The Coast Guard Research and Development Center has developed Coast
Guard POSAID2 ver 2.1a, a DOS-based program for converting LORAN-C
time differences (TDs) to latitude and longitude.
As the old link at the USCG site is apparently broken, I wonder if someone
in this novel group still has
Sorry:
NOBLE not novel...
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A definite maybe.
In the late 1970s, Raytheon farmed out their small boat LORAN receivers to
a New Hampshire company, Appelco. They made 8085 based LORAN receivers w/
LED readout of time differences.
Later, Appelco produced an upgraded version with a daughter board, also
with an 8085, that took
Hi,
The 1194 time service in Australia is one second fast. I'm ringing
from Hobart - can anyone else in Australia confirm?
Jim
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Hi John I have a manual dated 1989 for a later version Apelco ( DXL 6300)
The manual covers operation nicely, but the data for the Lessay chain is
incorrect. I can enter the GRI manually and the receiver locks nicely. I
have disassembled the eprom but cannot recognise the data areas to patch the
dos program here :
http://www.loran.org/gptotd.zip
info here :
http://www.loran.org/Coordinates.htm
Stanley
- Original Message
From: J. Forster j...@quik.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Fri, July 9, 2010 5:14:59 PM
Subject: Re:
Hi John I have a manual dated 1989 for a later version Apelco ( DXL 6300)
The manual covers operation nicely, but the data for the Lessay chain is
incorrect. I can enter the GRI manually and the receiver locks nicely. I
have disassembled the eprom but cannot recognise the data areas to patch
Hi
The 74F175 is in stock at Mouser. I'll let Rich decide if it's good enough.
Bob
Sent from my iPhone
On Jul 9, 2010, at 5:16 PM, Stanley Reynolds stanley_reyno...@yahoo.com wrote:
I was thinking of using a 74F175 not as fast uses more power but I have it.
Stanley
snip
7) The
Yeah the AES / EBU timing is just to sync clocks in house, it's not
actually going to be used as a genlock source for equipment.. just slave
clock displays...
On Fri, 2010-07-09 at 08:38 -0400, Bob Camp wrote:
Hi
The Thunderbolt has a GPS and an OCXO inside it. It's built in smarts align a
Hi
The RS-232 USB dongles are $4 these days. They are enough cheaper that the TTL
ones that the MAX232 and misc parts still don't make them more expensive.
Bob
Sent from my iPhone
On Jul 9, 2010, at 5:28 PM, Richard H McCorkle mccor...@ptialaska.net wrote:
Bob,
I included the option to go
On 7/6/2010 11:13 PM, J.L. wrote:
I could not find any cross reference for either of these NPN transistors but
the 2NA seemed to do just fine.
Thanks for everyone's help.
Joe
1854-0003 (subsequently replaced by 1854-0637) crosses to Moto/On Semi
SS2199.
1854-0023 cross to 2N2484
Time-Nuts,
When the PICTIC was first developed a number of front-end designs were
evaluated with the 74AC175 providing the best characteristics, size,
and speed in a DIP format. When the PICTIC was released in 2008 the
74AC175PC was in full production, but by the time the PICTIC II with
the diode
Richard,
For the original circuit board, what about the 74AC175 SOIC soldered to
an SOIC to DIP adapter? These adapters are available cheap on the
auction site and there should be very little difference between this and
the DIP version (the pinouts for both versions are the same). Would this
Any chance that someone could purchase a small quantity from Arrow
Germany so Stanley could include them with the boards we ordered?
Extra payment for the chips, of course.
Joe Gray
W5JG
On Fri, Jul 9, 2010 at 7:21 PM, Richard H McCorkle
mccor...@ptialaska.net wrote:
Time-Nuts,
When the
Ed,
This should work just as well as the original without compromizing the
maximum clock rate.
Richard
Richard,
For the original circuit board, what about the 74AC175 SOIC soldered to
an SOIC to DIP adapter? These adapters are available cheap on the
auction site and there should be very
Hi
For around $4 or so you can get a CPLD and socket that will replace all of the
logic chips. They will run on +5 and go to 100 MHz. My guess is that they
would be a bit more repeatable. The downside is it's another part to program.
Bob
Sent from my iPhone
On Jul 9, 2010, at 10:02 PM,
Would something like eBay 180460919851 be a suitable adaptor? The
description
says that it takes .1 header pins on .3 centers 'ready for socket insertion'.
I'm sure that there are other places (Sparkfun) that sell similar adaptors for
those that have an aversion to on-line auction sites for
On 7/9/2010 7:58 PM, Bob Camp wrote:
For around $4 or so you can get a CPLD and socket that will replace
all of the logic chips. They will run on +5 and go to 100 MHz. My
guess is that they would be a bit more repeatable. The downside is
it's another part to program.
Yep.I ordered a
http://www.futurlec.com/SMD_Adapters.shtml
Joe Gray
W5JG
On Fri, Jul 9, 2010 at 9:06 PM, Tom Clifton kc0...@yahoo.com wrote:
Would something like eBay 180460919851 be a suitable adaptor? The
description
says that it takes .1 header pins on .3 centers 'ready for socket insertion'.
I'm sure
Same ebay seller, different layout.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=18046092rvr_id=crlp=1_263602_263622UA=%3F*%3F%3FGUID=7c4b40741290a0b3f8f587f5ff797212itemid=18046092ff4=263602_263622
Joe Gray
W5JG
On Fri, Jul 9, 2010 at 9:06 PM, Tom Clifton kc0...@yahoo.com wrote:
The ebay item will fit the .3 inch spacing of the pcb. Looks like the futurlec
is .6 inch spacing like many of the other ebay items.
Stanley
- Original Message
From: Joseph Gray jg...@zianet.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Fri,
From ad :
0.700 accross: Not DIP socket insertable
for solderless breadboarding custom pcb only
Stanley
- Original Message
From: Joseph Gray jg...@zianet.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Fri, July 9, 2010 10:53:25 PM
Subject: Re:
stanley_reyno...@yahoo.com said:
The ebay item will fit the .3 inch spacing of the pcb.
Check the pinout. It's turned sideways.
--
These are my opinions, not necessarily my employer's. I hate spam.
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No, the ebay item 180460919851 looks correct, data sheet for 74ac175 has the
same pin out for all packages.
Attached a picture pin 1 to pin 1 no crossed pins.
Stanley
- Original Message
From: Hal Murray hmur...@megapathdsl.net
To: Discussion of precise time and frequency measurement
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