I'm looking at writing some code to drive the DTS 2070, but have been
running into timeout errors performing any GPIB query (even *IDN?) while the
instrument is taking measurements, even in sizes/sets of 1/1 at a 1-pps
rate. Has anyone else run into this before?
This happens equally with either
Hi
How long are the cables / what else is on the chain? They may not have proper
pull up's on the device.
Bob
On Nov 23, 2010, at 5:27 AM, John Miles wrote:
I'm looking at writing some code to drive the DTS 2070, but have been
running into timeout errors performing any GPIB query (even
Hi
If you are going to depend on any form of over the air timing, you need
holdover. It's not a option its a requirement. There are simply to many
things that can create issues with the signal you are using. That's true of any
over the air system, not just GPS. Redundancy would also be nice,
On that subject, I have a Symmetricom chassis for sale with Rb track/hold
(dual PRC inputs I believe, with room for a second holdover card,
dual power supply, and 16 2048Khz outputs - more reduncancy than you
would want).
Can go at time-nut price before it goes on auction.
+ ship from 3000 BE.
On 23/11/10 13:36, Bob Camp wrote:
Hi
If you are going to depend on any form of over the air timing, you need holdover. It's
not a option its a requirement. There are simply to many things that can
create issues with the signal you are using. That's true of any over the air system, not
just
Hi
Most telecom systems are still a timing monoculture. All of their sources
of time are duplicates of the same thing. There are multiple categories of
trouble that will affect all of their sources. Redundancy with multiple
types of timing is what would make a more robust system. That's the stuff
On 23/11/10 14:17, Bob Camp wrote:
Hi
Most telecom systems are still a timing monoculture. All of their sources
of time are duplicates of the same thing. There are multiple categories of
trouble that will affect all of their sources. Redundancy with multiple
types of timing is what would make a
Hi time-nuts,
I have about 25 or 30ea CMC ALLSTAR GPS board.
Software/hardware version 265-613940-513, var 001. with Racon 10.000MHz TCXO
Is there any useful application around??.. I tried to use in Brooks Shera
board but give a sloppy result.
If anybody need a board please contact me
I read that Phrack article and their jammer is much more sophisticated
than mine. Mine is just a sweeper. I don't even know yet the sweep
rate. I was thinking more along the lines of theirs. Something that
actually put out a signal that contained at least some aspects of the
signal they were
John Green wrote:
jamming anyone's GPS. A while back, I was looking at one of those
It doesn't look capable of putting out
more than 50 milliwatts or so into a 2 inch antenna
The GPS antenna is perhaps 35 feet away
with a cinder block wall, a brick wall, and a metal roof in between. I
also
John Green wrote:
I read that Phrack article and their jammer is much more sophisticated
than mine. Mine is just a sweeper. I don't even know yet the sweep
rate. I was thinking more along the lines of theirs. Something that
actually put out a signal that contained at least some aspects of the
scmcgr...@gmail.com wrote:
The Phrack article's jammer attacks the offset frequencies.
Phrack.org/issues.html?issue=60id=13
This article shows just how vulnerable L1 GPS is
I'm not very impressed by design...
That old Freescale/Motorola MC145151 PLL, and using a separate
prescaler? That's
On 23/11/10 16:12, jimlux wrote:
scmcgr...@gmail.com wrote:
The Phrack article's jammer attacks the offset frequencies.
Phrack.org/issues.html?issue=60id=13
This article shows just how vulnerable L1 GPS is
I'm not very impressed by design...
That old Freescale/Motorola MC145151 PLL, and
Hi Paul,
If you are using something different then an active
antennathat draws current. You need a 470 ohm resistor to
ground at the antenna bnc.The system sense current being
drawn both high and low.
Yes, this is understood. My antenna coupler for the W3 includes a 560 Ohm
resistor and
Hi
The same basic equations apply (as you point out) to any receiver. Lay down
enough on channel noise power and the receiver doesn't have much of a
chance. Nothing magic or terribly hard to figure out. Easy to do wideband at
I could use a baseball bat to I could use a bow and arrow type ranges.
John,
I do not have any experience with the Wavecrest but my experience with
devices that do not seem to answer on bus requests is that they often DO
ANSWER the request but after the answer they do not serve the bus's EOI line
correct. Checking the EOI line is the standard way that the controller
This: sours should of course read: source
-Ursprungliche Nachricht-
Von: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] Im Auftrag von Ulrich Bangert
Gesendet: Dienstag, 23. November 2010 18:32
An: 'Discussion of precise time and frequency measurement'
Betreff: Re:
Hi
There are indeed a number of devices that behave that way and work with that
fix. They can be a big pain if you then decide to go looking for binary
data. Polling the status is the only solution I have found in that case.
Bob
-Original Message-
From: time-nuts-boun...@febo.com
In the RC Model Airplane world where some brave souls are experimenting with
autonoumous (UAV) flight , it is usual that they have a part-15 video downlink
and/or telemetry at 900mhz or 2.4ghz and unless you put a trap on the input to
the GPS receiver to significantly reduce those frequencies
Not a problem on spelling especially if tired.
The problem you are running into is really curious indeed.
Since we have no LORAN C in N A anymore. I can only use the loran simulator
to drive the FS700 and that works very well. I have the antenuator in the
simulator at -55 db as I recall to
I've tried a few variations on EOI/EOS behavior. It's definitely not
sending either EOS characters or asserting EOI in the cases where the
timeout occurs... it's just not sending anything at all in those cases.
ibcntl=0, indicating no traffic arrived at all.
It seems that the DTS just doesn't
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