On 10/16/2013 8:26 PM, quartz55 wrote:
I've been searching for the small copper hardline I can use for the
feed on the gps volute (egg beater) antenna.
Can anyone steer me where to get a foot or so of the small 50 ohm
line so I can make a few antennas?
I've been searching mouser to
I posted a patch for the Fury to work with ntpd in Oct 2008. It uses
the GPGGA output. The PTIME:TCODE? command is not on-time with the
1-PPS output on the Fury, so the HPGPS driver does not work.
http://www.febo.com/pipermail/time-nuts/2008-October/033901.html
the ntp-fury.diff:
Except that if you blow the 54701A front-end, the IC is made of
unobtanium. Likewise, buying an untested probe...
As for the 4193A, if you know of an instrument without probe for $1, please
let me know ASAP!!!
The connector of the 4193A is the same awful connector as the 8411A so if
you wanted
On Thu, Oct 17, 2013 at 9:40 AM, Scott Mace sm...@intt.net wrote:
The PTIME:TCODE? command is not on-time with the 1-PPS output on the Fury
Is it consistently before or after the pulse? I.e. can it be fixed with
time1? Is there the same problem with the NMEA sentences?
In any case these
For some reason my outlook express gets really confused with these mail lists
(or maybe it's me). That said, when I see my replies, they look perfectly fine
in my outlook express, plus when I look in in the archived browser the message
seems to be in correct order too. Maybe someone can fill
Back in 2003 or so, in the Z3801A with hpgps ntpd refclock driver, I had to
add a negative offset of -0.98 seconds to the driver's decoding of
PTIME:TCODE? to get it to be right in combination with PPS refclock.
The documentation in the Z3801A manual correctly described the actual
behavior
FYI. Addresses LM317 noise in a simple implementation, how to reduce it, and
how it relates to other approaches and parts. Numerous graphs of noise voltage
versus frequency can prove enlightening.
http://www.edn.com/Home/PrintView?contentItemId=4422750
Mark,
Thats the big difference between the 54701A and most other fet probes, its
virtually indestructible. They even designed it so it can drop directly on its
tip without internal damage.
Big difference to most other fet probes, HP even has a nice write up on their
design efforts and how
The GPGGA sentence is on-time enough so that ntpd will work. You still
have to set 'mindist' to something like 0.050. The driver will also
query other interesting things from the Fury.
The response from PTIME:TCODE? varied too much for ntpd to use it even
with a large mindist.
OK I have really tried to stay clear of the discussion. My HP 8405 is in
fine shape including probes and dividers. Though clearly not of the class
of gear in discussion.
However homebrewing replacements is of interest.
My experience is with the HP power meters. I have a number of working
units.
Interesting.. I see something completely different with my Fury.
My hard-coded fudge factor is 0.077 yielding:
Every 2.0s: ntpq -p Thu Oct 17 10:20:00
2013
remote refid st t when poll reach delay offset
jitter
I think the Fury does not guarantee that the PTIME:TCODE will be near
the 1-PPS leading edge. When I tried it with the HPGPS driver and a
net4501, ntpd wasn't happy with it. I also needed leap second
processing to work, holdover notification, and to collect other data
from it. The GPGGA
It looks like in this Ubuntu I am using 28 SHM with gpsd which is different
that the soekris.
Sent from mobile
On Oct 17, 2013, at 1:00 PM, Scott Mace sm...@intt.net wrote:
I think the Fury does not guarantee that the PTIME:TCODE will be near the
1-PPS leading edge. When I tried it with
On Thu, Oct 17, 2013 at 2:00 PM, Scott Mace sm...@intt.net wrote:
Try setting your Fury hpgps driver fudge flag4 to 1
He said he thought he was using 20+22 (NMEA+PPS). Of course the ntpq
output suggests GPSD or other shared memory driver.
--
Paul
Correct. And I can access my soekris right now.
Sent from mobile
On Oct 17, 2013, at 1:35 PM, Paul tic-...@bodosom.net wrote:
On Thu, Oct 17, 2013 at 2:00 PM, Scott Mace sm...@intt.net wrote:
Try setting your Fury hpgps driver fudge flag4 to 1
He said he thought he was using 20+22
Yes, the GPGGA method works.
Scott
On 10/17/2013 01:35 PM, Paul wrote:
On Thu, Oct 17, 2013 at 2:00 PM, Scott Mace sm...@intt.net wrote:
Try setting your Fury hpgps driver fudge flag4 to 1
He said he thought he was using 20+22 (NMEA+PPS). Of course the ntpq
output suggests GPSD
L-com has some formable cable:
http://www.l-com.com/coaxial-semi-rigid-formable-cables
-Eric
On Wed, Oct 16, 2013 at 8:26 PM, quartz55 quart...@hughes.net wrote:
I've been searching for the small copper hardline I can use for the feed
on the gps volute (egg beater) antenna. Can anyone
On 2013-10-17 08:34, paul swed wrote:
However homebrewing replacements is of interest.
My experience is with the HP power meters. I have a number of working
units. But darned if the meters no probes or cables show up for a few
dollars at fleas. So last fall I built home brew bolometers. By god
I was wondering while I was messing with this project if anyone has tried a
Lindenblad for 1.575 GHz? I can see making the phasing lines would be
problematical, but the pattern looks right. What I intend on making to start
with is this one. http://lea.hamradio.si/~s53mv/navsats/analog.html
Worth also reading the very good (cited) article from Wenzel
http://www.wenzel.com/documents/finesse.html
Andy Bardagjy
bardagjy.com
On Thu, Oct 17, 2013 at 11:24 AM, Robert LaJeunesse
rlajeune...@sbcglobal.net wrote:
FYI. Addresses LM317 noise in a simple implementation, how to reduce it,
This isn't NMEA but many NMEA GPSes work just find and if you read the NMEA
specifications the ascci data only has to be valid for the second in it is
output. This allows for a random 0.... second offset.
If your ref cock is bothered by a .999 second offset I'd argue the ref
clock software
Would running RG-316 thru a hollow brass tube work? These are available
at most hobby stores in a variety of sizes and they are solderable.
Mike
On 10/16/2013 10:26 PM, quartz55 wrote:
I've been searching for the small copper hardline I can use for the feed on the
gps volute (egg beater)
On Oct 17, 2013, at 3:38 PM, Richard Karlquist rich...@karlquist.com wrote:
If you are below 80 MHz, Linear Technologies makes a thermal power meter
on a chip.
Alas, the LT1088 is no longer made.
http://www.linear.com/product/LT1088
Best regards,
-Steve
--
Steve Byan steveb...@me.com
Lacking any actual hardline, I ran RG-174 in brass tube from the hardware
store and had excellent results.
On Wed, Oct 16, 2013 at 11:26 PM, quartz55 quart...@hughes.net wrote:
I've been searching for the small copper hardline I can use for the feed
on the gps volute (egg beater) antenna.
On 10/17/13 4:46 PM, Steve Byan wrote:
On Oct 17, 2013, at 3:38 PM, Richard Karlquist rich...@karlquist.com wrote:
If you are below 80 MHz, Linear Technologies makes a thermal power meter
on a chip.
Alas, the LT1088 is no longer made.
http://www.linear.com/product/LT1088
Rochester
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