splitter, and
then a few feet of RG316 to my receiver.
Bob
From: jim s jwsm...@jwsss.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Wednesday, July 2, 2014 12:17 AM
Subject: Re: [time-nuts] FASTRAX GPS
Bob,
I was being
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?
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
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
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
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
play with that until the unit
can be trusted to give reliable NMEA and 1PPS output.
Unfinished page: http://leapsecond.com/pages/itrax/
/tvb
- Original Message -
From: Ernie Peres erniepe...@aol.com
To: time-nuts@febo.com
Sent: Wednesday, June 11, 2014 4:11 AM
Subject: Re: [time-nuts
AM
Subject: Re: [time-nuts] FASTRAX GPS
Bob,
I was being a bit lazy. The 15' distance gets from a couple of spots in
the room with my systems and lab, and also is already terminated, and
there is no issue with the power since it would be totally contained in
the unit.
But your suggestion
.
Unfinished page: http://leapsecond.com/pages/itrax/
/tvb
- Original Message -
From: Ernie Peres erniepe...@aol.com
To: time-nuts@febo.com
Sent: Wednesday, June 11, 2014 4:11 AM
Subject: Re: [time-nuts] FASTRAX GPS
Hi Jason,
I figured out a different pin assignments
hold the PCB
jwsm...@jwsss.com said:
I want a long run because where I plan to use it is some distance from
clear line of site.
It's often easier to use a long serial cable rather than a long antenna cable.
http://www.ebay.com/itm/321295751672
This one happens to be 5 meters long and is active. ...
and frequency measurement time-nuts@febo.com
Sent: Tuesday, July 1, 2014 4:56 PM
Subject: Re: [time-nuts] FASTRAX GPS
I went back thru this thread to look for the answer, and did not see it
so am asking. The one of these I have has a threaded female connector
on it. One of the ones in Tom's page has
On 7/1/2014 8:27 PM, Hal Murray wrote:
It's often easier to use a long serial cable rather than a long antenna cable.
Excellent suggestion. I will look at that as an alternative. I wanted
to keep the FASTRAX and the unit is mated to near my systems, but for
other GPS setups with other chips
Bob,
I was being a bit lazy. The 15' distance gets from a couple of spots in
the room with my systems and lab, and also is already terminated, and
there is no issue with the power since it would be totally contained in
the unit.
But your suggestion and some work making the cables would work
/pages/itrax/
/tvb
- Original Message -
From: Ernie Peres erniepe...@aol.com
To: time-nuts@febo.com
Sent: Wednesday, June 11, 2014 4:11 AM
Subject: Re: [time-nuts] FASTRAX GPS
Hi Jason,
I figured out a different pin assignments
hold the PCB so that the SMA antenna connector
: Jason Rabel ja...@extremeoverclocking.com
o: time-nuts@febo.com
ubject: Re: [time-nuts] FASTRAX GPS
essage-ID: 002001cf8405$b0ddc2e0$129948a0$@extremeoverclocking.com
ontent-Type: text/plain;charset=us-ascii
Ernie,
I'm having issues right now, I need to find my adapter cable as the one I have
Ernie,
I got a couple of those off eBay too, they've been sitting on my desk for the
past week or so. I'll experiment with them today to
figure out the pinout and post my results.
Sometimes the Trimble manuals get their pinouts upside down. Also the itrax
doesn't appear to have any
Ernie,
I'm having issues right now, I need to find my adapter cable as the one I have
right now is the wrong pin spacing. I did trace the
lines on the PCB and it appears to be the same as the Resolution-T / Lassen /
other Trimble pinouts...
Just FYI, I couldn't find a valid link to the 3.41
Hi,
I have a few of this GPS board / iTrax130 / but unable to figure out the pin
assignment...it has 8pins on the board and somebody told me it is same as the
Trimble Resolution-T but seems to me it is not .
Any help?
Thanks a lot in advance.
Ernie.
-Original Message-
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