David,
On 06/29/2014 12:33 PM, Dr. David Kirkby wrote:
I know of NPL in the UK, and NIST in the USA, but is anyone aware of
other standard labs. In particular I am looking for the Australian
equivalent. A Google search came across Standards Australia
http://www.standards.org.au/
but I don't
To you and Hal who suggested it, is this unit suitable for outputing a1pps
timing signal? Wouldn't the long serial option Hal suggestion mess that
up, vs. using this method to put the Fastax as close as possible to a
system which which would have the systems gpio and serial ports attached?
On 2 Jul 2014 07:55, Magnus Danielson mag...@rubidium.dyndns.org wrote:
The authoritative source is BIPM:
http://www.bipm.org/en/practical_info/useful_links/nmi.html
Thank you. That is a useful resource to know of.
which points to:
http://www.measurement.gov.au/Pages/default.aspx
Thanks,
Em 02/07/2014 05:04, Hal Murray escreveu:
If you want to go farther or faster, it's probably wise to shift to
differential signaling.
This. always use 485/422 drivers (2 pairs, one in each direction) + 1
pair for VCC + 1 pair for GND in a CAT-5 cable. If you are carefull you
can choose the
After talking with Hartmut off list and finding out that no family lives
close by I decided to send this letter shown below in German, hand written
on German condolence stationary to his neighbor and friend. The English
translation is below.
Sehr geehrte Herr Hackfeld,
Als Erstes möchte
I tried using a long serial cable. Just because I had some 100 feet
of cat-5 wire already installed. It did not work reliably I was using
a MAX232 chip as a driver. I could have made it work by using
differential drivers/receivers at each end but I had some good antenna
lead, pulled that into a
Emailed Pete at Everset about the ES100 and 200 chips and unfortunately
only chip dies are available. I am good but not that good.
He suggests that someday a vendor will be selling a clock and thats the
only reasonable option that will be available.
All in all completely unattractive, as someone
Hi
If you want to go a bit crazy, there are places that will package up die for
you. Depending on the resulting package, cost is in the $0.30 to $20 per part
range. Most of the places will hit you with a ~ $500 setup charge and are
unlikely to deal in less than 1,000 piece lots (unless things
albertson.ch...@gmail.com said:
I tried using a long serial cable. Just because I had some 100 feet of
cat-5 wire already installed. It did not work reliably I was using a MAX232
chip as a driver.
Were you using it as 8 separate wires or 4 pairs?
I'd expect RS-232 to work over 100 ft of
Hi
There are an enormous number of variables in real world RS-232 (as opposed to
spec compliant RS-232).
Are you driving with = +/- 5V or maybe with 3V?
Do you have 1 to 2 K ohm current limiting resistors on the drivers (popular in
the 1970’s) ?
How big is the dead band / hysteresis on your
Bob
Funny you mention that. I actually have a remote chance of actually doing
that.
I know a guy who knows a guy... I really don't want to get tangled in that
total distraction actually. The value of the chip in at least a predictive
wwvb d-psk-r is that you could easily obtain the nasty DST data.
In message
cad2jfahocx5nyhmzjgrgwb4oljawumvwm7fvocym_y6agaa...@mail.gmail.com, paul swed
writes:
Though if the clocks are in the $20 range thats a different discussion.
Somehow I suspect its the $1000 range. No honest clue though.
In europe a Swiss company put a weather-transmission on DCF77
In message 23298.1404324...@critter.freebsd.dk, Poul-Henning Kamp writes:
In message
cad2jfahocx5nyhmzjgrgwb4oljawumvwm7fvocym_y6agaa...@mail.gmail.com, paul
swed writes:
Though if the clocks are in the $20 range thats a different discussion.
Somehow I suspect its the $1000 range. No honest
My 2c - RS232 is extensively used in data centres over cat5 with network kit
for out of band management via serial consoles, usually 9600 baud.
I've done this many times via (multiple) patching panels/frames easily over
100ft, ribbon/rollover then cat6 but also cat5. This kit tends to be
I tried using it as pairs but you really can't. You have Tx, Rx and
the PPS all sharing one ground return and the ground is not even a
current return because each end is connected tho the building ground
system. So you can TRY to use pairs like I did but it remains
unbalanced.
Yes you can make
the trick of every data line is; it has to me matched to it's impedance,
at least at the receiving end, other way it is ringing. Every pair of
conductor becomes transmission line as soon it's length exceeds the
length of the rise time of the signal which is traveling on it.
73
Alex
On
On Wed, Jul 2, 2014 at 1:00 PM, Alexander Pummer alex...@ieee.org wrote:
I've done this many times via (multiple) patching panels/frames easily
over 100ft, ribbon/rollover then cat6 but also cat5. This kit tends to be
reliable...
Does this include the PPS signal on the DTR pin? I think this
Hello,
AFAIK, the differential variant of RS-232 is RS-485. I'm not sure about the
levels.
Best regards,
Jean-Louis Oneto
Envoyé depuis un mobile Samsung
Message d'origine
De : Chris Albertson albertson.ch...@gmail.com
Date :02/07/2014 21:36 (GMT+01:00)
A : Discussion
On 7/2/2014 1:29 PM, Jean-Louis Oneto wrote:
Hello,
AFAIK, the differential variant of RS-232 is RS-485. I'm not sure about the
levels.
Best regards,
Jean-Louis Oneto
You have to control the direction of RS485. You don't have to with
RS232. One of the problems with support of RS485 in
I noticed on Toms info page, (very good along with the two emails for
info) that there is no connection called out for the antenna power.
There are two power in pins, Primary and Backup power. Since I'm going
to use an active antenna, can I send the 5 v up the antenna power, or
will the
jl.on...@free.fr said:
AFAIK, the differential variant of RS-232 is RS-485. I'm not sure about the
levels.
RS-422 is the basic version:
http://en.wikipedia.org/wiki/RS-422
RS-485 is the multipoint version.
Interesting comment from http://en.wikipedia.org/wiki/EIA-485
The EIA once
I have run 9600 baud data over 200-300' many times and the statement that a
RS232 driver is being used (presumably a Max-232 which is pretty popular
the one we use) then it will drive a couple of hundred feet of wire BUT
there is one catch we learned early-on. That is to double up the wires to
For GPS you need to also include the microseconds long pulse per
second. I think it might by the very short duty cycle of the pulse
that makes it hard to transmit using RS-232 style signaling.
Also how do you measure success on that 300' line? How were errors detected/
On Wed, Jul 2, 2014 at
Hello,
AFAIK, the differential variant of RS-232 is RS-485. I'm not sure about
the levels.
You might be thinking about RS-422. That is the one most like RS232.
It is mostly easy to interconnect 232 and 422.
Using 422 it would be easy to send a serial signal a kilometer over
cat-5 wire and at
Jim,
I'm a rather junior member of the list, but I wouldn't try to move 1PPS over
that kind of distance; especially when it's so easy to put the receiver right
next to what needs the 1PPS. The pros are too small and the cons are too
great. There are a couple of vendors on ebay who sell F to
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