Interesting article in GPS World...
http://www.gpsworld.com/gnss-system/augmentation-assistance/news/work-begin
s-strengthening-egnos-against-solar-storms-12772?utm_source=GPSutm_medium=e
mailutm_campaign=navigate_03_20_2012utm_content=work-begins-strengthening-
egnos-against-solar-storms-12772
All,
There have been numerous discussions on antennae position in the group, so I
thought the following might be interesting to both old and new to TF.
I've recently had a small extension to the house built which is now my
office/workshop. Living in a conservation area in the Peak District in
Do not forget that BlackBox sold Converters and Controllers that are identical
internally to the IOTech boxes.
The EPROMs can also be swapped between these two.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: J. L. Trantham
Hi all,
I just discovered that TI makes a TDC chip called THS788, see
http://www.ti.com/product/ths788 for more info. Interesting specs, but rather
expensive. Has anyone from the list had a chance to experiment with this device?
Cheers
Stefan
___
13ps resolution at 200Msps sampling rate and real 15.8Msps output data
throughput? not too many around :)
Regards,
Javier
El 21/03/2012 15:44, David escribió:
I am surprised it is not more accurate and precise. Even old discrete
designs can get down to 10ps or better. I wonder what
In message 003e01cd0751$ded32f60$9c798e20$@btinternet.com, Rob Kimberley wr
ites:
As I couldn't mount the antennae on the roof, I had to get creative.
What kind of roofing do you have ? You can get pretty good results
under the roof as long as it is not metalic or to thick ceramics.
--
I suppose there is limited interest in homebrew GPS receivers given how cheap
the fully integrated chipsets are. However, just noticed the below tuner chip
intended for DTV, actually lists GPS L1 as an applicable frequency. A TV Tuner
USB stick using this chip is available for $20, and some
Hi
Unless they picked it up and moved it, Dana is in Indiana not Illinois :)...
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Stan, W1LE
Sent: Tuesday, March 20, 2012 10:45 AM
To: Discussion of precise time and frequency
On Wed, 21 Mar 2012 09:44:14 -0500, David davidwh...@gmail.com wrote:
I am surprised it is not more accurate and precise. Even old discrete
designs can get down to 10ps or better. I wonder what market it is
for where space is at that much of a premium.
Out of curiosity, would you happen to
Looks like this bounced as I sent from the wrong address. Better late
than never.
On Wed, 14 Mar 2012 15:46:48 -0700, Chuck Forsberg WA7KGX N2469R
c...@omen.com wrote:
Asus has a $30 Xonar PCI soundcard that should do the job.
I have two of the the more expensive pci-e versions. Some
And in any case, with four receivers, wouldn't a single aerial and a
splitter be more economical and save on feeder costs?
Mind you, having an eight way splitter as I do does tend to encourage
gps proliferation :^)
Dan
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time-nuts mailing list
Hi
Are you after 12 ns or 12 ps?
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ben Gamari
Sent: Wednesday, March 21, 2012 12:18 PM
To: David; Discussion of precise time and frequency measurement
Subject: [time-nuts] Experience
On Wed, 21 Mar 2012 11:51:53 -0400, Ben Gamari bgam...@gmail.com
wrote:
On Wed, 21 Mar 2012 09:44:14 -0500, David davidwh...@gmail.com wrote:
I am surprised it is not more accurate and precise. Even old discrete
designs can get down to 10ps or better. I wonder what market it is
for where
I suppose there is limited interest in homebrew GPS receivers given how
cheap the fully integrated chipsets are. However, just noticed the below
tuner chip intended for DTV, actually lists GPS L1 as an applicable
frequency. A TV Tuner USB stick using this chip is available for $20,
and some
On Wed, 21 Mar 2012 16:40:27 -, David J Taylor
david-tay...@blueyonder.co.uk wrote:
I suppose there is limited interest in homebrew GPS receivers given how
cheap the fully integrated chipsets are. However, just noticed the below
tuner chip intended for DTV, actually lists GPS L1 as an
I tried inside as a first pass, but no good. The roof is tiled, but has a
metal clad foam insulation layer on all walls and ceiling.
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Poul-Henning Kamp
Sent: 21 March 2012 15:59
To:
The NTP servers use the Meinberg down-converter antennae and therefore not
compatible with the Odetics unit. I had the antennae, but don't have any
splitter/combiners so that was the only solution.
Rob
-Original Message-
From: time-nuts-boun...@febo.com
http://www.funcubedongle.com/
but perhaps not fast enough for you.
Or not wide enough in this case. The FunCube technical FAQ says the
bandwidth is about 80 KHz as it is designed for narrow band reception
only and accessed as a standard USB sound device. I do not quite
understand how 96
Don, you are absolutely correct, Dana is in Indiana and not Illinois.
Austron offered a model 2084 LF Multicoupler, with 1 antenna input and 4
outputs.
Could be AC or DC powered, with peak and spherics indicator lamps, and 8
each tunable
notch filters from 70 thru 130 KHz that can be
Stan if you are talking about the austrons I know how to set them.
Could call you if thats easier
On Wed, Mar 21, 2012 at 10:10 AM, Stan, W1LE stanw...@verizon.net wrote:
Don, you are absolutely correct, Dana is in Indiana and not Illinois.
Austron offered a model 2084 LF Multicoupler, with
Prologix would be happy to host your samples, or link to them, from our
website. Our customers will benefit much from your work.
Abdul
www.prologix.biz
supp...@prologix.biz
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Hal Murray
Bob Camp li...@rtty.us writes:
Hi
Are you after 12 ns or 12 ps?
Bah, yes, my bad: picoseconds is the relevant timescale here.
Cheers,
- Ben
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To unsubscribe, go to
Am Thu, 15 Mar 2012 22:08:12 +0100
schrieb Azelio Boriani azelio.bori...@screen.it:
Yes, there is people who have what in the past was expensive test
equipment and now can be bought by 1/10 of the original price. The
problem is that you need someone who can record 2 seconds of a signal
that
Hi
Ok, for a legit 12 ps with 0.1 ps drift and 200 mega samples per second -
not to many alternatives. The FPGA stuff will get you to 50 to 100 ps on the
same basis this gets you to 12 ps. They will get you to 20 to 40 ps on a
good day - sort of the way this chip gets 8 ps. The FPGA will do it at
We had the SMBV100 (full options loaded) on a demo for very few days and I
used it as a GPS simulator. The menus I have used didn't let me figure out
what kind of operating system was underneath...
On Wed, Mar 21, 2012 at 9:49 PM, Florian Teply use...@teply.info wrote:
Am Thu, 15 Mar 2012
Jim Williams wrote an appnote on how to do this with ~100ps resolution with
a small number of parts.
I think it was mentioned before and should be in the time nuts archives..
His circuit can be modified without much effort for higher resolution.
bye,
Said
In a message dated 3/21/2012
Bob Camp li...@rtty.us writes:
Hi
Ok, for a legit 12 ps with 0.1 ps drift and 200 mega samples per second -
not to many alternatives. The FPGA stuff will get you to 50 to 100 ps on the
same basis this gets you to 12 ps. They will get you to 20 to 40 ps on a
good day - sort of the way this
Hi,
The NIM Negative pulse is indeed problematic when trying to interface to
FPGA logic!
The solution I have used in the past is a board based around a Maxim
MAX9601[1] acting as a comparator on the incoming NIIM pulse, and
configuring the output for connection to the FPGA. Judging by the
Their prices seems to be in the same ball park as the Austin lab
(TesCom) that we use at work. Does anyone know anyone that offers
'hobbyist' rates? I could easily spend $1000 getting my equipment
cal'd, but certainly can't justify the budget.
Mike
On 3/20/2012 11:52 PM, Joseph Gray wrote:
Two suggestions:
How about using an off-the-shelf Wavecrest counter?
These have a 0.8ps resolution, and typically have a noise floor of around
3ps when averaging. They certainly can do 10ps single shot. There is a
DTS-2050 on Ebay now for $700: item number 120647180882
You can't get much
I have a question for the collective group.
I have a HP 5372A and a HP 5328A frequency counters. Both counters use the same
PRS-10 Rubidium frequency standard driving a 6 channel reference distribution
amplifier
to each counters reference input port. The problem is this;
When I measure the same
First, try counting the Rd reference frequency output. If one reads right
you are halfway to solving the problem.
John WA4WDL
--
From: Jerry Mulchin jmulc...@cox.net
Sent: Wednesday, March 21, 2012 8:05 PM
To: time-nuts@febo.com
Subject:
What happens if you feed the 10MHz external clock to the input. If you
measure the reference frequency you should get 10MHz dead-on exact even if
the reference is not exactly 10MHz. If you don't get this, the counter
has a problem.
I have seem my two counters disagree when I tried to measure
Yes, first try the Rb with their internal timebases. Got the PRS10? Nice Rb
reference: I had one (brand new) last month for only one week...
On Thu, Mar 22, 2012 at 1:11 AM, jmfranke jmfra...@cox.net wrote:
First, try counting the Rd reference frequency output. If one reads right
you are
Jerry,
My guess is that the amplitude of the reference signal may be on the ragged
edge of what the counters require- either just barely adequate, or much too
hot and being distorted. Also, check to see if the source and load
impedances are matched. I once corrected a similar problem by
On 3/21/12 9:17 AM, beale wrote:
I suppose there is limited interest in homebrew GPS receivers given how cheap
the fully integrated chipsets are. However, just noticed the below tuner chip
intended for DTV, actually lists GPS L1 as an applicable frequency. A TV Tuner
USB stick using this
The frequency is always at least 200 to 300Hz off between the two
counters
and I don't know
which one to believe. You know the man with 2 clocks problem.
Anyone have any idea what may be causing this?
What are you measuring? Are both of the counters' inputs set to 50 ohms,
and if so, are
It must be that one counter has not switched to ext ref. It has been a while
with both these counters, does the 5328A auto switch to ext ref?
The 5372A does have an auto ref switch and will acept 1,2,5,and 10MHz+/-1% at
1-5VPP . A quick way to check that ext ref is seen by the 5372A is during
The 5328A is manually switched. 30kHz to 10 MHz 1V RMS min, 5VP-P max
into 1kohm.
Mike
On 3/21/2012 7:39 PM, Tom Knox wrote:
It must be that one counter has not switched to ext ref. It has been a while
with both these counters, does the 5328A auto switch to ext ref?
The 5372A does have
Okay. A little 3586B hacking was required, but here are some wide-band
results: http://www.jks.com/wwvb/wwvb.html#wideband
Thanks very much. This data shows the full-bandwidth WWVB signal very
well. Attached are some plots and an octave script.
The first plot shows the demodulated WWVB
Thanks to all that replied.
The problem is my 5328A reference input amplitude, and possibly the input
module.
I lowered the reference amplitude to 4.9v p-p and the accuracy got better, but
not
the same as the 5372A. So I suspect that the input front end may have something
wrong with it. I have
List,
I saw a picture somewhere where someone added a GPSDO to the back of a HP3586
but it didn’t give any details.
My question: I have the Ovenaire model 42-16 high stability oscillator but it
has only four wires to the base. Can one apply EFC to it or does one need
another oscillator?
List,
The other day I had my second HP 3586B power supply board smoked. It burned
both the PC board traces and the connector on the motherboard so badly it will
have to be replaced. Also an inch or so of one trace on the mother board but
it looks like it will be repairable. Fortunately I
So I went through the entire instrument and came up with a list of all the
Sprague TVA electrolytics that I am going to replace as they are dated coded
1983.
So two questions. One, can I safely double the capacitance of the filter
capacitors? (I plan on using the 105C 10K hour high
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